Difference between revisions of "API:EPrints/Database"

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  -->{{API}}{{Pod2Wiki}}{{API:Source|file=perl_lib/EPrints/Database.pm|package_name=EPrints::Database}}[[Category:API|DATABASE]][[Category:API:EPrints/Database|DATABASE]]<div><!-- Edit below this comment -->
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  -->{{API}}{{Pod2Wiki}}{{API:Source|file=EPrints/Database.pm|package_name=EPrints::Database}}[[Category:API|DATABASE]][[Category:API:EPrints/Database|DATABASE]]<div><!-- Edit below this comment -->
  
  
 
<!-- Pod2Wiki=_private_ --><!-- Pod2Wiki=head_name -->
 
<!-- Pod2Wiki=_private_ --><!-- Pod2Wiki=head_name -->
 
==NAME==
 
==NAME==
'''EPrints::Database''' - a connection to the SQL database for an eprints session
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'''EPrints::Database''' - a connection to the SQL database for an eprints session.
  
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</div>
==SYNOPSIS==
 
  $db = $repo-&gt;database
 
  $sth = $db-&gt;prepare("SELECT 'hello, world!'");
 
  $sth-&gt;execute;
 
  print $sth-&gt;fetchrow_arrayref-&gt;[0], "\n";
 
 
 
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<!-- Pod2Wiki=head_description -->
 
==DESCRIPTION==
 
==DESCRIPTION==
 
EPrints Database Access Module
 
EPrints Database Access Module
  
Provides access to the backend database. All database access is performed via this module to 1) provide cross-database support and 2) improve security through enforcing proper quoting of SQL values.
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Provides access to the backend database. All database access done via this module, in the hope that the backend can be replaced as easily as possible.
  
In most use-cases it should not be necessary to use the database module directly. Instead you should use [[API:EPrints/DataSet|EPrints::DataSet]] or [[API:EPrints/MetaField|EPrints::MetaField]] accessor methods to access objects and field values respectively.
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In most use-cases it should not be necessary to use the database module directly. Instead you should use [[API:EPrints/DataSet|EPrints::DataSet]] or [[API:EPrints/MetaField|EPrints::MetaField]] accessor methods to access objects and field values respectively.
  
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</div>
 
<!-- Pod2Wiki=head_cross_database_support -->
 
<!-- Pod2Wiki=head_cross_database_support -->
 
===Cross-database Support===
 
===Cross-database Support===
Any use of SQL statements must use [[API:EPrints/Database#quote_identifier|quote_identifier]] to quote database tables and columns and [[API:EPrints/Database#quote_value|quote_value]] to quote values. The only exception to this are the EPrints::Database::* modules which provide database-driver specific extensions.
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Any use of SQL statements must use [[API:EPrints/Database#quote_identifier|quote_identifier]] to quote database tables and columns and quote_value to quote values. The only exception to this are the EPrints::Database::* modules which provide database-driver specific extensions.  
  
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</div>
 
<!-- Pod2Wiki=head_quoting_sql_values -->
 
<!-- Pod2Wiki=head_quoting_sql_values -->
 
===Quoting SQL Values===
 
===Quoting SQL Values===
By convention variables that contain already quoted values are prefixed with 'Q_' so they can be easily recognised when used in string interpolation:
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By convention variables that contain already quoted values are prefixed with <tt>Q_</tt> so they can be easily recognised when used in string interpolation:  
  
  my $Q_value = $db-&gt;quote_value( "Hello, World!" );
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my $Q_value = $db-&gt;quote_value( "Hello, World!" );
  $db-&gt;do("SELECT $Q_value");
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$db-&gt;do("SELECT $Q_value");
 
    
 
    
Where possible you should avoid quoting values yourself, instead use a method that accepts unquoted values which will (safely) do the work for you.
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Where possible you should avoid quoting values yourself, instead use a method that accepts unquoted values which will (safely) do the work for you.
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</div>
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<!-- Pod2Wiki=head_constants -->
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==CONSTANTS==
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All the <tt>SQL_</tt> column types defined by Perl module {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}} and the  following:
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<!-- Pod2Wiki=item_sql_null -->
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===SQL_NULL===
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A column value is undefined.
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<!-- Pod2Wiki=item_sql_not_null -->
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===SQL_NOT_NULL===
  
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A column value is defined.
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==INSTANCE VARIABLES==
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<!-- Pod2Wiki=item_$self->{session} -->
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===$self-&gt;{session}===
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The [[API:EPrints/Session|EPrints::Session]] which is associated with this database  connection.
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===$self-&gt;{debug}===
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If <tt>true</tt> then SQL is logged.
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===$self-&gt;{dbh}===
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The handle on the actual database connection.
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==METHODS==
 
==METHODS==
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<!-- Pod2Wiki=head_database -->
 
<!-- Pod2Wiki=head_database -->
 
===Database===
 
===Database===
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<!-- Pod2Wiki=item_new -->
 
<!-- Pod2Wiki=item_new -->
 
====new====
 
====new====
  
<source lang="perl">$db = EPrints::Database->new( $repo )
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$db = EPrints::Database-&gt;new( $repo, [ %opts ] )
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Create a connection to the database.
  
</source>
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Options:
Create a connection to the database.
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  db_connect - Boolean. Also connect to the database (default: true).
  
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<!-- Pod2Wiki=item_create -->
 
<!-- Pod2Wiki=item_create -->
 
====create====
 
====create====
  
<source lang="perl">$db = $db->create( $username, $password )
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$db = $db-&gt;create( $username, $password )
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Create and connect to a new database using user account <tt>$username</tt>  and <tt>$password</tt>.
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<!-- Pod2Wiki=item_build_connection_string -->
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====build_connection_string====
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 +
$dbstr = EPrints::Database::build_connection_string( %params )
 +
Build the string to use to connect to the database via {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}}.
  
</source>
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Parameters:
Create and connect to a new database using super user account $username and $password.
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dbname - Database name (REQUIRED).
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dbdriver - Database driver (e.g. mysql, Oracle, pgsql, default: mysql).
 +
dbhost - Database host.  Assumes localhost if unset.
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dbport - Port to connect to database host.  Assumes default for driver if unset.
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dbsock - Socket file to connect to database through.
  
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<!-- Pod2Wiki=item_connect -->
 
<!-- Pod2Wiki=item_connect -->
 
====connect====
 
====connect====
  
<source lang="perl">$ok = $db->connect
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$db-&gt;connect()
 
 
</source>
 
 
Connects to the database.  
 
Connects to the database.  
  
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<!-- Pod2Wiki=item_disconnect -->
 
<!-- Pod2Wiki=item_disconnect -->
 
====disconnect====
 
====disconnect====
  
<source lang="perl">$db->disconnect
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$db-&gt;disconnect()
 
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Disconnects from the EPrints database. Should always be done before  any script exits.
</source>
 
Disconnects from the EPrints database.
 
  
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<!-- Pod2Wiki=item_set_debug -->
 
<!-- Pod2Wiki=item_set_debug -->
 
====set_debug====
 
====set_debug====
  
<source lang="perl">$db->set_debug( $boolean )
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$db-&gt;set_debug( $boolean )
 
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Set the SQL debug mode to <tt>true</tt> or <tt>false</tt>.
</source>
 
Set the SQL debug mode to true or false.
 
  
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<!-- Pod2Wiki=item_set_version -->
 
<!-- Pod2Wiki=item_set_version -->
 
====set_version====
 
====set_version====
  
<source lang="perl">$db->set_version( $versionid );
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$db-&gt;set_version( $versionid );
 
+
Set the version id table in the SQL database to the given <tt>versionid</tt> (used by the upgrade script).
</source>
 
Set the version id table in the SQL database to the given value (used by the upgrade script).
 
  
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<!-- Pod2Wiki=item_get_version -->
 
====get_version====
 
====get_version====
  
<source lang="perl">$version = $db->get_version
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$version = $db-&gt;get_version
 
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Returns the current database schema version.  
</source>
 
Returns the current database schema version.
 
  
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<!-- Pod2Wiki=item_is_latest_version -->
 
<!-- Pod2Wiki=item_is_latest_version -->
 
====is_latest_version====
 
====is_latest_version====
  
<source lang="perl">$boolean = $db->is_latest_version
+
$boolean = $db-&gt;is_latest_version
 
+
Return <tt>true</tt> if the SQL tables are in the correct configuration for this edition of eprints. Otherwise, <tt>false</tt>.
</source>
 
Return true if the database schema is in the correct configuration for this version of eprints. Otherwise false.
 
  
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<!-- Pod2Wiki=item_get_server_version -->
 
<!-- Pod2Wiki=item_get_server_version -->
 
====get_server_version====
 
====get_server_version====
  
<source lang="perl">$version = $db->get_server_version
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$version = $db-&gt;get_server_version
 
 
</source>
 
 
Return the database server version.
 
Return the database server version.
  
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<!-- Pod2Wiki=item_get_default_charset -->
 
<!-- Pod2Wiki=item_get_default_charset -->
 
====get_default_charset====
 
====get_default_charset====
  
<source lang="perl">$charset = $db->get_default_charset( LANGUAGE )
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$charset = $db-&gt;get_default_charset
 
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Return the character set to use.
</source>
 
Return the character set to use for LANGUAGE.
 
  
Returns undef if character sets are unsupported.
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Returns <tt>undef</tt> if character sets are unsupported.
  
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<!-- Pod2Wiki=item_get_default_collation -->
 
<!-- Pod2Wiki=item_get_default_collation -->
 
====get_default_collation====
 
====get_default_collation====
  
<source lang="perl">$collation = $db->get_default_collation( LANGUAGE )
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$collation = $db-&gt;get_default_collation( $lang )
 
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Return the collation to use for language <tt>$lang</tt>.
</source>
 
Return the collation to use for LANGUAGE.
 
  
Returns undef if collation is unsupported.
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Returns <tt>undef</tt> if collation is unsupported.
  
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<!-- Pod2Wiki=item_get_driver_name -->
 
====get_driver_name====
 
====get_driver_name====
  
<source lang="perl">$driver = $db->get_driver_name
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$driver = $db-&gt;get_driver_name
 
 
</source>
 
 
Return the database driver name.
 
Return the database driver name.
  
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<!-- Pod2Wiki=item_error -->
 
====error====
 
====error====
  
<source lang="perl">$errstr = $db->error
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$errstr = $db-&gt;error()
 
 
</source>
 
 
Return a string describing the last SQL error.
 
Return a string describing the last SQL error.
  
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<!-- Pod2Wiki=item_retry_error -->
 
====retry_error====
 
====retry_error====
  
<source lang="perl">$bool = $db->retry_error
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$boolean = $db-&gt;retry_error()
 
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Returns a boolean for whether the database error is a retry error.
</source>
 
Returns true if the current error is a retry error.
 
  
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<!-- Pod2Wiki=item_duplicate_error -->
 
====duplicate_error====
 
====duplicate_error====
  
<source lang="perl">$bool = $db->duplicate_error
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$boolean = $db-&gt;duplicate_error()
 
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Returns a boolean for whether the database error is a duplicate error.
</source>
 
Returns true if the current error is a PRIMARY KEY or UNIQUE error.
 
  
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<!-- Pod2Wiki=item_begin -->
 
<!-- Pod2Wiki=item_begin -->
 
====begin====
 
====begin====
  
<source lang="perl">$db->begin
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$db-&gt;begin()
 
 
</source>
 
 
Begin a transaction.
 
Begin a transaction.
  
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<!-- Pod2Wiki=item_commit -->
 
<!-- Pod2Wiki=item_commit -->
 
====commit====
 
====commit====
  
<source lang="perl">$db->commit
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$db-&gt;commit()
 
 
</source>
 
 
Commit the previously begun transaction.
 
Commit the previously begun transaction.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_rollback -->
 
<!-- Pod2Wiki=item_rollback -->
 
====rollback====
 
====rollback====
  
<source lang="perl">$db->rollback
+
$db-&gt;rollback()
 
+
Rollback the partially completed transaction.
</source>
 
Roll-back the current transaction.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_type_info -->
 
<!-- Pod2Wiki=item_type_info -->
 
====type_info====
 
====type_info====
  
<source lang="perl">$type_info = $db->type_info( DATA_TYPE )
+
$type_info = $db-&gt;type_info( $data_type )
 
 
</source>
 
 
See {{API:PodLink|file=DBI|package_name=DBI|section=type_info|text=DBI/type_info}}.
 
See {{API:PodLink|file=DBI|package_name=DBI|section=type_info|text=DBI/type_info}}.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_get_column_type -->
 
<!-- Pod2Wiki=item_get_column_type -->
 
====get_column_type====
 
====get_column_type====
  
<source lang="perl">$real_type = $db->get_column_type( NAME, TYPE, NOT_NULL, [ LENGTH/PRECISION ], [ SCALE ], %opts )
+
$real_type = $db-&gt;get_column_type( $name, $data_type, $not_null, [ $length, $scale, %opts ] )
 
+
Returns a SQL column definition for <tt>$name</tt> of type <tt>$type</tt>, usually something like:
</source>
 
Returns a SQL column definition for NAME of type TYPE, usually something like:
 
  
 
   $name $type($length,$scale) [ NOT NULL ]
 
   $name $type($length,$scale) [ NOT NULL ]
 
    
 
    
If NOT_NULL is true column will be set "not null".
+
If <tt>$not_null</tt> is <tt>true</tt> column will be set to <tt>NOT NULL</tt>.
  
LENGTH/PRECISION and SCALE control the maximum lengths of character or decimal types (see below).
+
<tt>$length</tt> and <tt>$scale</tt> control the maximum lengths of character or decimal types (see below).
  
 
Other options available to refine the column definition:
 
Other options available to refine the column definition:
Line 319: Line 446:
 
   sorted - whether this column will be used to order by
 
   sorted - whether this column will be used to order by
 
    
 
    
'''langid''' is mapped to real database values by the "dblanguages" configuration option. The database may not be able to order the request column type in which case, if '''sorted''' is true, the database may use a substitute column type.
+
'''langid''' is mapped to real database values by the "dblanguages" configuration option. The database may not be able to order the request column type in which case, if <tt>sorted</tt> is true, the database may use a substitute column type.
  
TYPE is the SQL type. The types are constants defined by this module, to import them use:
+
<tt>$data_type</tt> is the SQL type. The types are constants defined by this module, to import them use:
  
 
   use EPrints::Database qw( :sql_types );
 
   use EPrints::Database qw( :sql_types );
 
    
 
    
Supported types (n = requires LENGTH argument):
+
Supported types (n = requires <tt>$length</tt> argument):
  
Character data: SQL_VARCHAR(n), SQL_LONGVARCHAR, SQL_CLOB.
+
Character data: <tt>SQL_VARCHAR(n)</tt>, <tt>SQL_LONGVARCHAR</tt>, <tt>SQL_CLOB</tt>.
  
Binary data: SQL_VARBINARY(n), SQL_LONGVARBINARY.
+
Binary data: <tt>SQL_VARBINARY(n)</tt>, <tt>SQL_LONGVARBINARY</tt>.
  
Integer data: SQL_TINYINT, SQL_SMALLINT, SQL_INTEGER, SQL_BIGINT.
+
Integer data: <tt>SQL_TINYINT</tt>, <tt>SQL_SMALLINT</tt>, <tt>SQL_INTEGER</tt>, <tt>SQL_BIGINT</tt>.
  
Floating-point data: SQL_REAL, SQL_DOUBLE.
+
Floating-point data: <tt>SQL_REAL</tt>, <tt>SQL_DOUBLE</tt>.
  
Time data: SQL_DATE, SQL_TIME.
+
Time data: <tt>SQL_DATE</tt>, <tt>SQL_TIME</tt>.
  
 
The actual column types used will be database-specific.
 
The actual column types used will be database-specific.
  
 +
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</div>
 
<!-- Pod2Wiki=head_basic_sql_operations -->
 
<!-- Pod2Wiki=head_basic_sql_operations -->
===Basic SQL operations===
+
===Basic SQL Operations===
 +
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</div>
 
<!-- Pod2Wiki=item_do -->
 
<!-- Pod2Wiki=item_do -->
 
====do====
 
====do====
  
<source lang="perl">$success = $db->do( $sql )
+
$success = $db-&gt;do( $sql )
 
+
Execute the given <tt>$sql</tt>.
</source>
 
Execute the given SQL.
 
  
 +
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</div>
 
<!-- Pod2Wiki=item_prepare -->
 
<!-- Pod2Wiki=item_prepare -->
 
====prepare====
 
====prepare====
  
<source lang="perl">$sth = $db->prepare( $sql )
+
$sth = $db-&gt;prepare( $sql )
 
+
Prepare the given <tt>$sql</tt> and return a handle on it.
</source>
 
Prepare the SQL statement $sql for execution.
 
  
 
Use the <tt>execute</tt> method on the returned {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}} handle to execute the SQL:
 
Use the <tt>execute</tt> method on the returned {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}} handle to execute the SQL:
Line 374: Line 506:
 
   $sth-&gt;execute;
 
   $sth-&gt;execute;
 
    
 
    
 +
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</div>
 
<!-- Pod2Wiki=item_prepare_select -->
 
<!-- Pod2Wiki=item_prepare_select -->
 
====prepare_select====
 
====prepare_select====
  
<source lang="perl">$sth = $db->prepare_select( $sql [, %options ] )
+
$sth = $db-&gt;prepare_select( $sql, [ %options ] )
 +
Prepare a <tt>SELECT</tt> statement <tt>$sql</tt> and return a handle to it. After  preparing a statement use <tt>execute()</tt> to execute it.
  
</source>
+
Returns a {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}} statement handle.  
Prepare a SELECT statement $sql for execution. This method provides cross-database support for getting a part of the result list based on an offset/limit.
 
  
Returns a {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}} statement handle.
+
The <tt>LIMIT</tt> SQL keyword is not universally supported, to specify this  use the <tt>limit</tt> option.
  
 
Options:
 
Options:
  
 
   limit - limit the number of rows returned
 
   limit - limit the number of rows returned
   offset - return limit number of rows after offset
+
   offset - return '''limit''' number of rows after offset
 
    
 
    
 +
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</div>
 +
<!-- Pod2Wiki=item_execute -->
 +
====execute====
 +
 +
$success = $db-&gt;execute( $sth, $sql )
 +
Execute the SQL prepared earlier in the <tt>$sth</tt>. <tt>$sql</tt> is only  required for debugging purposes.
 +
 +
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 +
</div>
 
<!-- Pod2Wiki=item_update -->
 
<!-- Pod2Wiki=item_update -->
 
====update====
 
====update====
  
<source lang="perl">$rows = $db->update( $tablename, $keycols, $keyvals, $columns, $values )
+
$success = $db-&gt;update( $dataset, $data, $changed )
 
+
Updates a <tt>EPrints::DataObj</tt> from <tt>$dataset</tt> with the given <tt>$data</tt>.  The primary key field (e.g. <tt>eprintid</tt>) value must be included.
</source>
 
UPDATEs $columns with the equivalent slot from $values where the rows in $tablename match the $keycols/$keyvals.
 
  
Returns the number of rows affected or false on error, see {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}}'s execute() method.
+
Updates the <tt>ordervalues</tt> if the <tt>$dataset</tt> is  {{API:PodLink|file=EPrints/DataSet#ordered|package_name=EPrints::DataSet#ordered|section=|text=ordered}}.
  
  $db-&gt;update(
+
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    'eprint',
+
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    ['eprintid'],
 
    [23],
 
    ['title','description'],
 
    ['Hello, World!', undef]
 
  );
 
 
 
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
<!-- Pod2Wiki=item_update_quoted -->
+
</div>
====update_quoted====
+
<!-- Pod2Wiki=item__update -->
 +
====_update====
  
<source lang="perl">$success = $db->update_quoted( $tablename, $keycols, $keyvals, $columns, $Q_values )
+
$rows = $db-&gt;_update( $tablename, $keycols, $keyvals, $columns, @values )
 +
Updates <tt>$columns</tt> in <tt>$tablename</tt> with <tt>@values</tt> where <tt>$keycols</tt>  equals <tt>$keyvals</tt> and returns the number of rows affected.
  
</source>
+
N.B. If no rows are affected, the result is still <tt>true</tt>,  see {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}}'s <tt>execute()</tt> method.
UPDATEs $tablename where $keycols equals $keyvals.
 
  
Returns the number of rows affected or false on error, see {{API:PodLink|file=DBI|package_name=DBI|section=|text=DBI}}'s execute() method.
+
This is an internal method.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_insert -->
 
<!-- Pod2Wiki=item_insert -->
 
====insert====
 
====insert====
  
<source lang="perl">$success = $db->insert( $table, $columns, @values )
+
$success = $db-&gt;insert( $table, $columns, @values )
 
+
Inserts <tt>@values</tt> into the table <tt>$table</tt>. If <tt>$columns</tt> is defined it will be used as a list of columns to insert into. <tt>@values</tt> is a list of arrays containing values to insert. These will be quoted before insertion.
</source>
 
Inserts values into the table $table. If $columns is defined it will be used as a list of columns to insert into. @values is a list of arrays containing values to insert.
 
 
 
Values will be quoted before insertion.
 
  
 +
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</div>
 
<!-- Pod2Wiki=item_insert_quoted -->
 
<!-- Pod2Wiki=item_insert_quoted -->
 
====insert_quoted====
 
====insert_quoted====
  
<source lang="perl">$success = $db->insert_quoted( $table, $columns, @Q_values )
+
$success = $db-&gt;insert_quoted( $table, $columns, @qvalues )
 
+
Inserts values into the table <tt>$table</tt>. If <tt>$columns</tt> is defined it will be used as a list of columns to insert into. <tt>@qvalues</tt> is a list of arrays containing values to insert. These will NOT be quoted before insertion - care must be exercised!
</source>
 
Inserts values into the table $table. If $columns is defined it will be used as a list of columns to insert into. @qvalues is a list of arrays containing values to insert.
 
 
 
Values will NOT be quoted before insertion - care must be exercised!
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_delete_from -->
 
<!-- Pod2Wiki=item_delete_from -->
 
====delete_from====
 
====delete_from====
  
<source lang="perl">$success = $db->delete_from( $table, $columns, @values )
+
$success = $db-&gt;delete_from( $table, $columns, @values )
 +
Perform a SQL <tt>DELETE FROM</tt> <tt>$table</tt> using <tt>$columns</tt> to build a  where clause. <tt>@values</tt> is a list of array references of values in  the same order as <tt>$columns</tt>.
  
</source>
+
If you want to clear a table completely use <tt>clear_table()</tt>.
Perform a SQL DELETE FROM $table using $columns to build a where clause. @values is a list of array references of values in the same order as $columns.
 
 
 
If you want to clear a table completely use clear_table().
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_count_table -->
 
<!-- Pod2Wiki=item_count_table -->
 
====count_table====
 
====count_table====
  
<source lang="perl">$n = $db->count_table( $tablename )
+
$n = $db-&gt;count_table( $tablename )
 
+
Return the number of rows in the specified SQL table with  <tt>$tablename</tt>.
</source>
 
Return the number of rows in the specified SQL table.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_clear_table -->
 
<!-- Pod2Wiki=item_clear_table -->
 
====clear_table====
 
====clear_table====
  
<source lang="perl">$db->clear_table( $tablename )
+
$db-&gt;clear_table( $tablename )
 
+
Clears all records from the given table with <tt>$tablename</tt>. Use with  caution!
</source>
 
Clears all records from the given table, use with caution!
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=head_quoting -->
 
<!-- Pod2Wiki=head_quoting -->
 
===Quoting===
 
===Quoting===
 +
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</div>
 
<!-- Pod2Wiki=item_prep_int -->
 
<!-- Pod2Wiki=item_prep_int -->
 
====prep_int====
 
====prep_int====
  
<source lang="perl">$mungedvalue = EPrints::Database::prep_int( $value )
+
$mungedvalue = EPrints::Database::prep_int( $value )
 
+
Escape numerical <tt>$value</tt> for an SQL statement. <tt>undef</tt> becomes <tt>NULL</tt>. Anything else becomes a number (zero if needed).
</source>
 
Escape a numerical value for SQL. undef becomes NULL. Anything else becomes a number (zero if needed).
 
  
 +
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</div>
 
<!-- Pod2Wiki=item_prep_value -->
 
<!-- Pod2Wiki=item_prep_value -->
 
====prep_value====
 
====prep_value====
  
<source lang="perl">$mungedvalue = EPrints::Database::prep_value( $value )
+
$mungedvalue = EPrints::Database::prep_value( $value )
 
+
Escape <tt>$value</tt> for an SQL statement. Modify value such that <tt>"</tt>  becomes <tt>\"</tt> and <tt>\</tt> becomes <tt>\\</tt> and <tt>'</tt> becomes <tt>\'</tt>.
</source>
 
Escape a value for SQL. Modify value such that " becomes \" and \ becomes \\ and ' becomes \'
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_prep_like_value -->
 
<!-- Pod2Wiki=item_prep_like_value -->
 
====prep_like_value====
 
====prep_like_value====
  
<source lang="perl">$mungedvalue = EPrints::Database::prep_like_value( $value )
+
$mungedvalue = EPrints::Database::prep_like_value( $value )
 
+
Escape <tt>$value</tt> for an SQL <tt>LIKE</tt> clause. In addition to <tt>'</tt> <tt>"</tt>  and <tt>\</tt> also escapes <tt>%</tt> and <tt>_</tt>.
</source>
 
Escape an value for an SQL like field. In addition to ' " and \ also escapes % and _
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_quote_value -->
 
<!-- Pod2Wiki=item_quote_value -->
 
====quote_value====
 
====quote_value====
  
<source lang="perl">$str = $db->quote_value( $value )
+
$str = $db-&gt;quote_value( $value )
 
+
Return a quoted version of <tt>$value</tt>. To quote a <tt>LIKE</tt> value you should use:
</source>
 
Return a quoted value. To quote a 'like' value you should do:
 
  
  my $str = $database-&gt;quote_value( EPrints::Database::prep_like_value( $foo ) . '%' );
+
  $db-&gt;quote_value( EPrints::Database::prep_like_value( $foo ) . '%' );
 
    
 
    
 +
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 +
</div>
 
<!-- Pod2Wiki=item_quote_int -->
 
<!-- Pod2Wiki=item_quote_int -->
 
====quote_int====
 
====quote_int====
  
<source lang="perl">$str = $db->quote_int( $value )
+
$str = $db-&gt;quote_int( $value )
 
+
Return a quoted integer for <tt>$value</tt>.
</source>
 
Return a quoted integer value
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_quote_binary -->
 
<!-- Pod2Wiki=item_quote_binary -->
 
====quote_binary====
 
====quote_binary====
  
<source lang="perl">$str = $db->quote_binary( $bytes )
+
$str = $db-&gt;quote_binary( $bytes )
 
+
Some databases (Oracle/PostgreSQL) require transforms of binary data to work correctly.
</source>
 
Some databases (Oracle/PostgreSQL) require transforms of binary data to work correctly.
 
  
This method should be called on data containing nul bytes or back-slashes before being passed on [[API:EPrints/Database#quote_value|quote_value]].
+
This method should be called on data <tt>$bytes</tt> containing null bytes or back-slashes before being passed on [[API:EPrints/Database#quote_value|quote_value]].
  
 +
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</div>
 
<!-- Pod2Wiki=item_quote_ordervalue -->
 
<!-- Pod2Wiki=item_quote_ordervalue -->
 
====quote_ordervalue====
 
====quote_ordervalue====
  
<source lang="perl">$str = $db->quote_ordervalue( $field, $value )
+
$str = $db-&gt;quote_ordervalue( $field, $value )
 
+
Some databases (Oracle) can't order by <tt>CLOB</tt>s so need special treatment when creating the ordervalues tables. This method allows any fixing-up required for string data <tt>$value</tt> for <tt>$field</tt> before it's inserted.
</source>
 
Some databases (Oracle) can't order by CLOBS so need special treatment when creating the ordervalues tables. This method allows any fixing-up required for string data before it's inserted.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_quote_identifier -->
 
<!-- Pod2Wiki=item_quote_identifier -->
 
====quote_identifier====
 
====quote_identifier====
  
<source lang="perl">$str = $db->quote_identifier( @parts )
+
$str = $db-&gt;quote_identifier( @parts )
 
+
Quote a database identifier (e.g. table names). Multiple <tt>@parts</tt>  will be joined by dots (<tt>.</tt>).
</source>
 
Quote a database identifier (e.g. table names). Multiple @parts will be joined by dot.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_prepare_regexp -->
 
<!-- Pod2Wiki=item_prepare_regexp -->
 
====prepare_regexp====
 
====prepare_regexp====
  
<source lang="perl">$sql = $db->prepare_regexp( $quoted_column, $quoted_value )
+
$sql = $db-&gt;prepare_regexp( $col, $value )
 
+
The syntax used for regular expressions varies across databases. This method takes two quoted string and returns a SQL expression that will apply the quoted regexp <tt>$value</tt> to the quoted column <tt>$col</tt>.
</source>
 
The syntax used for regular expressions varies across databases. This method takes two '''quoted''' values and returns a SQL expression that will apply the regexp ($quoted_value) to the column ($quoted_column).
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_sql_as -->
 
<!-- Pod2Wiki=item_sql_as -->
 
====sql_as====
 
====sql_as====
  
<source lang="perl">$sql = $db->sql_AS()
+
$sql = $db-&gt;sql_AS()
 
+
Returns the syntactic glue to use when aliasing. SQL 92 databases will happily use <tt>AS</tt> but some databases (Oracle) will not accept it.
</source>
 
Returns the syntactic glue to use when aliasing. SQL 92 DBs will happilly use " AS " but some DBs (Oracle!) won't accept it.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_sql_like -->
 
<!-- Pod2Wiki=item_sql_like -->
 
====sql_like====
 
====sql_like====
  
<source lang="perl">$sql = $db->sql_LIKE()
+
$sql = $db-&gt;sql_LIKE()
 
+
Returns the syntactic glue to use when making a case-insensitive <tt>LIKE</tt>. PostgreSQL requires <tt>ILIKE</tt> while everything else uses <tt>LIKE</tt> and the column collation.
</source>
 
Returns the syntactic glue to use when making a case-insensitive LIKE. PostgreSQL requires "ILIKE" while everything else uses "LIKE" and the column collation.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=head_counters -->
 
<!-- Pod2Wiki=head_counters -->
 
===Counters===
 
===Counters===
 +
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 +
</div>
 
<!-- Pod2Wiki=item_counter_current -->
 
<!-- Pod2Wiki=item_counter_current -->
 
====counter_current====
 
====counter_current====
  
<source lang="perl">$n = $db->counter_current( $counter )
+
$n = $db-&gt;counter_current( $counter )
 
+
Return the value of the previous counter_next on <tt>$counter</tt>.
</source>
 
Return the value of the previous counter_next on $counter.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_counter_next -->
 
<!-- Pod2Wiki=item_counter_next -->
 
====counter_next====
 
====counter_next====
  
<source lang="perl">$n = $db->counter_next( $counter )
+
$n = $db-&gt;counter_next( $counter )
 
+
Return the next unused value for the named <tt>$counter</tt>. Returns <tt>undef</tt> if the <tt>$counter</tt> doesn't exist.
</source>
 
Return the next unused value for the named counter. Returns undef if the counter doesn't exist.
 
  
 +
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</div>
 
<!-- Pod2Wiki=item_counter_minimum -->
 
<!-- Pod2Wiki=item_counter_minimum -->
 
====counter_minimum====
 
====counter_minimum====
  
<source lang="perl">$db->counter_minimum( $counter, $value )
+
$db-&gt;counter_minimum( $counter, $value )
 
+
Ensure that the <tt>$counter</tt> is set no lower than <tt>$value</tt>. This is used when importing eprints which may not be in scrict sequence.
</source>
 
Ensure that the counter is set no lower than $value. This is used when importing eprints which may not be in scrict sequence.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_counter_reset -->
 
<!-- Pod2Wiki=item_counter_reset -->
 
====counter_reset====
 
====counter_reset====
  
<source lang="perl">$db->counter_reset( $counter )
+
$db-&gt;counter_reset( $counter )
 
+
Reset the <tt>$counter</tt>. Use with caution.
</source>
 
Reset the counter. Use with caution.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_next_doc_pos -->
 
<!-- Pod2Wiki=item_next_doc_pos -->
 
====next_doc_pos====
 
====next_doc_pos====
  
<source lang="perl">$n = $db->next_doc_pos( $eprintid )
+
$n = $db-&gt;next_doc_pos( $eprintid )
 
+
Return the next unused document position for the given <tt>$eprintid</tt>.
</source>
 
Return the next unused document pos for the given eprintid.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=head_dataset_data -->
 
<!-- Pod2Wiki=head_dataset_data -->
===Dataset data===
+
===Dataset Data===
 +
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</div>
 
<!-- Pod2Wiki=item_exists -->
 
<!-- Pod2Wiki=item_exists -->
 
====exists====
 
====exists====
  
<source lang="perl">$boolean = $db->exists( $dataset, $id )
+
$boolean = $db-&gt;exists( $dataset, $id )
 
+
Return <tt>true</tt> if there exists an [[API:EPrints/DataObj|EPrints::DataObj]] from the <tt>$dataset</tt> with its primary key set to <tt>$id</tt>. Otherwise, return  <tt>false</tt>.
</source>
 
Return true if a record with the given primary key exists in the dataset, otherwise false.
 
 
 
<!-- Edit below this comment -->
 
 
 
 
 
<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki=item_insert_data -->
 
====insert_data====
 
 
 
<source lang="perl">$success = $db->insert_data( $dataset, $data )
 
 
 
</source>
 
Add the given data as a new record in the given dataset. $data is a reference to a hash containing values structured for a record in the that dataset.
 
 
 
Returns undef if a record already exists with the key field value in $data.
 
 
 
Inserts ordervalues if the dataset is {{API:PodLink|file=EPrints/DataSet|package_name=EPrints::DataSet|section=ordered|text=ordered}}.
 
  
 +
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<!-- Pod2Wiki=item_update_data -->
+
</div>
====update_data====
+
<!-- Pod2Wiki=item_add_record -->
 
+
====add_record====
<source lang="perl">$success = $db->update_data( $dataset, $data, $changed )
 
 
 
</source>
 
Updates a record in the given {{API:PodLink|file=EPrints/DataSet|package_name=EPrints::DataSet|section=|text=$dataset}}. $data is a copy of the entire record's data and $changed the values that have changed.
 
 
 
If the record does not already exist or the key field is unset in $data no changes will be written.
 
  
Updates ordervalues if the dataset is {{API:PodLink|file=EPrints/DataSet|package_name=EPrints::DataSet|section=ordered|text=ordered}}.
+
$success = $db-&gt;add_record( $dataset, $data )
 +
Add the given <tt>$data</tt> as a new record in the given <tt>$dataset</tt>.  <tt>$data</tt> is a reference to a hash containing values structured for a  record in the that <tt>$dataset</tt>.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_remove -->
 
<!-- Pod2Wiki=item_remove -->
 
====remove====
 
====remove====
  
<source lang="perl">$success = $db->remove( $dataset, $id )
+
$success = $db-&gt;remove( $dataset, $id )
 
+
Attempts to remove the [[API:EPrints/DataObj|EPrints::DataObj]] with the primary key <tt>$id</tt>  from the specified <tt>$dataset</tt>.
</source>
 
Remove the record, index terms and order value with the key field value $id from the specified dataset.
 
 
 
Returns true on success.
 
  
 +
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</div>
 
<!-- Pod2Wiki=head_searching_caching_and_object_retrieval -->
 
<!-- Pod2Wiki=head_searching_caching_and_object_retrieval -->
 
===Searching, caching and object retrieval===
 
===Searching, caching and object retrieval===
 +
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 +
</div>
 
<!-- Pod2Wiki=item_cache_exp -->
 
<!-- Pod2Wiki=item_cache_exp -->
 
====cache_exp====
 
====cache_exp====
  
<source lang="perl">$searchexp = $db->cache_exp( $cacheid )
+
$searchexp = $db-&gt;cache_exp( $cacheid )
 
+
Return the serialised search of a the cached search with <tt>$cacheid</tt>. Return <tt>undef</tt> if the <tt>$cacheid</tt> is invalid or expired.
</source>
 
Return the serialised Search of a the cached search with id $cacheid. Return undef if the id is invalid or expired.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_cache -->
 
<!-- Pod2Wiki=item_cache -->
 
====cache====
 
====cache====
  
<source lang="perl">$cacheid = $db->cache( $searchexp, $dataset, $srctable, [$order], [$list] )
+
$cacheid = $db-&gt;cache( $searchexp, $dataset, $srctable, [$order], [$list] )
 
+
Create a cache of the specified search expression from the SQL table <tt>$srctable</tt>.
</source>
 
Create a cache of the specified search expression from the SQL table $srctable.
 
  
If $order is set then the cache is ordered by the specified fields. For example "-year/title" orders by year (descending). Records with the same year are ordered by title.
+
If <tt>$order</tt> is set then the cache is ordered by the specified fields. For example <tt>-year/title</tt> orders by year (descending). Records with the same year are ordered by title.
  
If $srctable is set to "LIST" then order is ignored and the list of ids is taken from the array reference $list.
+
If <tt>$srctable</tt> is set to <tt>LIST</tt> then order is ignored and the list of IDs is taken from the array reference <tt>$list</tt>.
  
If $srctable is set to "ALL" every matching record from $dataset is added to the cache, optionally ordered by $order.
+
If <tt>$srctable</tt> is set to <tt>ALL</tt> every matching record from $dataset is added to the cache, optionally ordered by <tt>$order</tt>.
  
 +
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</div>
 
<!-- Pod2Wiki=item_cache_table -->
 
<!-- Pod2Wiki=item_cache_table -->
 
====cache_table====
 
====cache_table====
  
<source lang="perl">$tablename = $db->cache_table( $id )
+
$tablename = $db-&gt;cache_table( $id )
 +
Return the name of the SQL table used to store the cache with <tt>$id</tt>.
 +
 
 +
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 +
 
 +
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_cache_userid -->
 +
====cache_userid====
 +
 
 +
$userid = $db-&gt;cache_userid( $id )
 +
Returns the <tt>userid</tt> associated with the cache with <tt>$id</tt> if that  cache exists.
 +
 
 +
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 +
 
 +
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_get_cachemap -->
 +
====get_cachemap====
  
</source>
+
$cachemap = $db-&gt;get_cachemap( $id )
Return the SQL table used to store the cache with id $id.
+
Return the cachemap with $&lt;id&gt;.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_search -->
 
<!-- Pod2Wiki=item_search -->
 
====search====
 
====search====
  
<source lang="perl">$ids = $db->search( $keyfield, $tables, $conditions, [$main_table_alias] )
+
$ids = $db-&gt;search( $keyfield, $tables, $conditions, [ $main_table_alias ] )
 
+
Return a reference to an array of <tt>$keyfield</tt> IDs - the results of the search specified by <tt>$conditions</tt> across the tables specified in the <tt>$tables</tt> hash where keys are tables aliases and values are table names.  
</source>
 
Return a reference to an array of ids - the results of the search specified by $conditions accross the tables specified in the $tables hash where keys are tables aliases and values are table names.  
 
  
If no table alias is passed then M is assumed.  
+
If no <tt>$main_table_alias</tt> is specified then <tt>M</tt> is assumed.  
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_drop_cache -->
 
<!-- Pod2Wiki=item_drop_cache -->
 
====drop_cache====
 
====drop_cache====
  
<source lang="perl">$db->drop_cache( $id )
+
$db-&gt;drop_cache( $id )
 
+
Remove the cached search with the given <tt>$id</tt>.
</source>
 
Remove the cached search with the given id.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_from_cache -->
 
<!-- Pod2Wiki=item_from_cache -->
 
====from_cache====
 
====from_cache====
  
<source lang="perl">$foo = $db->from_cache( $dataset, $cacheid, [$offset], [$count], [$justids] )
+
$items = $db-&gt;from_cache( $dataset, $cacheid, [ $offset, $count, $justids ] )
 
+
Return a reference to an array containing all the items from the given <tt>$dataset</tt> that have IDs in the cache specified by <tt>$cacheid</tt>. The cache may be specified either by ID or serialised search expression.  
</source>
 
Return a reference to an array containing all the items from the given dataset that have id's in the specified cache. The cache may be specified either by id or serialised search expression.  
 
  
$offset is an offset from the start of the cache and $count is the number of records to return.
+
<tt>$offset</tt> is an offset from the start of the cache and <tt>$count</tt> is the number of records to return.
  
If $justids is true then it returns just an ref to an array of the record ids, not the objects.
+
If <tt>$justids</tt> is <tt>true</tt> then it returns just a reference to an array of the record IDs and not the objects themselves.
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_drop_orphan_cache_tables -->
 
<!-- Pod2Wiki=item_drop_orphan_cache_tables -->
 
====drop_orphan_cache_tables====
 
====drop_orphan_cache_tables====
  
<source lang="perl">$c = $db->drop_orphan_cache_tables
+
$c = $db-&gt;drop_orphan_cache_tables
 
+
Drop tables called <tt>cacheXXX</tt> where <tt>XXX</tt> is an integer. Returns the number of cache tables dropped.
</source>
 
Drop tables called "cacheXXX" where XXX is an integer. Returns the number of tables dropped.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_get_single -->
 
<!-- Pod2Wiki=item_get_single -->
 
====get_single====
 
====get_single====
  
<source lang="perl">$obj = $db->get_single( $dataset, $id )
+
$obj = $db-&gt;get_single( $dataset, $id )
 
+
Return a single &lt;EPrints::DataObj&gt; from the given <tt>$dataset</tt> with primary key set to <tt>$id</tt>.
</source>
 
Return a single item from the given dataset. The one with the specified id.
 
  
 +
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 +
</div>
 
<!-- Pod2Wiki=item_get_all -->
 
<!-- Pod2Wiki=item_get_all -->
 
====get_all====
 
====get_all====
  
<source lang="perl">$items = $db->get_all( $dataset )
+
$items = $db-&gt;get_all( $dataset )
 
+
Returns a reference to an array with all the &lt;EPrints::DataObj&gt;s from the given <tt>$dataset</tt>.
</source>
 
Returns a reference to an array with all the items from the given dataset.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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 +
</div>
 
<!-- Pod2Wiki=item_get_cache_ids -->
 
<!-- Pod2Wiki=item_get_cache_ids -->
 
====get_cache_ids====
 
====get_cache_ids====
  
<source lang="perl">@ids = $db->get_cache_ids( $dataset, $cachemap, $offset, $count )
+
@ids = $db-&gt;get_cache_ids( $dataset, $cachemap, $offset, $count )
 
+
Returns a list of <tt>$count</tt> IDs from <tt>$cache_id</tt> starting at <tt>$offset</tt> and in the order in the <tt>$cachemap</tt>.
</source>
 
Returns a list of $count ids from $cache_id starting at $offset and in the order in the cachemap.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_get_dataobjs -->
 
<!-- Pod2Wiki=item_get_dataobjs -->
 
====get_dataobjs====
 
====get_dataobjs====
  
<source lang="perl">@dataobjs = $db->get_dataobjs( $dataset [, $id [, $id ] ] )
+
@dataobjs = $db-&gt;get_dataobjs( $dataset, [ $id, $id, ... ] )
 
+
Retrieves the records in <tt>$dataset</tt> with the given <tt>$id</tt>(s). If an <tt>$id</tt> doesn't exist in the database it will be ignored.
</source>
 
Retrieves the records in $dataset with the given $id(s). If an $id doesn't exist in the database it will be ignored.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_get_values -->
 
<!-- Pod2Wiki=item_get_values -->
 
====get_values====
 
====get_values====
  
<source lang="perl">$foo = $db->get_values( $field, $dataset )
+
$values = $db-&gt;get_values( $field, $dataset )
 +
Return a reference to an array of all the distinct values of the  [[API:EPrints/MetaField|EPrints::MetaField]] <tt>$field</tt> for the <tt>$dataset</tt> specified.
  
</source>
+
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
Return a reference to an array of all the distinct values of the  [[API:EPrints/MetaField|EPrints::MetaField]] specified.
+
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 +
 
 +
 
 +
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_sort_values -->
 +
====sort_values====
  
 +
$values = $db-&gt;sort_values( $field, $values, [ $langid ] )
 +
Sorts and returns the list of <tt>$values</tt> using the database.
 +
 +
<tt>$field</tt> is used to get the order value for each value. <tt>$langid</tt>  (or $session-&gt;get_langid if unset) is used to determine the database  collation to use when sorting the resulting order values.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_get_ids_by_field_values -->
 
<!-- Pod2Wiki=item_get_ids_by_field_values -->
 
====get_ids_by_field_values====
 
====get_ids_by_field_values====
  
<source lang="perl">$ids = $db->get_ids_by_field_values( $field, $dataset [ %opts ] )
+
$ids = $db-&gt;get_ids_by_field_values( $field, $dataset, [ %opts ] )
 
+
Return a reference to a hash table where the keys are specified  <tt>$datasets</tt>'s <tt>$field</tt> value IDs and the values are references to arrays of IDs.
</source>
 
Return a reference to a hash table where the keys are field value ids and the value is a reference to an array of ids.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_dequeue_events -->
 
<!-- Pod2Wiki=item_dequeue_events -->
 
====dequeue_events====
 
====dequeue_events====
  
<source lang="perl">@events = $db->dequeue_events( $n )
+
@events = $db-&gt;dequeue_events( $n )
 +
Attempt to dequeue upto <tt>$n</tt> events. May return between <tt>0</tt> and  <tt>$n</tt> events depending on parallel processes and how many events are  remaining in the queue.
  
</source>
+
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
Attempt to dequeue upto $n events. May return between 0 and $n events depending on parallel processes and how many events are remaining on the queue.
+
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 +
 
 +
 
 +
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 +
</div>
 +
<!-- Pod2Wiki=item_ci_lookup -->
 +
====ci_lookup====
 +
 
 +
$value = $db-&gt;ci_lookup( $field, $value )
 +
This is a hacky method to support case-insensitive lookup for usernames, emails, etc. It returns the actual case-sensitive version of <tt>$value</tt> if there is a case-insensitive match for the <tt>$field</tt>.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Pod2Wiki= -->
<!-- Pod2Wiki=head_password_validation -->
+
</div>
===Password Validation===
+
<!-- Pod2Wiki=head_password_validation_and_secret_fields -->
 +
===Password Validation and Secret Fields===
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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</div>
 
<!-- Pod2Wiki=item_valid_login -->
 
<!-- Pod2Wiki=item_valid_login -->
 
====valid_login====
 
====valid_login====
  
<source lang="perl">$real_username = $db->valid_login( $username, $password )
+
$db-&gt;valid_login( $username, $password )
 +
Returns whether the clear-text <tt>$password</tt> matches the stored crypted  password for the <tt>$username</tt>.
 +
 
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</source>
 
Tests whether the clear-text $password matches the stored encrypted password for $username.
 
  
Returns the user's real (case-sensitive) username or undef if the passwords don't match.
+
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_secret_matches -->
 +
====secret_matches====
  
 +
$db-&gt;secret_matches( $dataobj, $fieldname, $token [, $callback ] )
 +
Returns whether the clear-text <tt>$token</tt> matches the stored crypted  field with <tt>$fieldname</tt> for the <tt>$dataobj</tt> according to the  <tt>$callback</tt> function.
 +
 +
If not set, <tt>$callback</tt> defaults to [[API:EPrints/Utils#crypt_equals|EPrints::Utils#crypt_equals]].
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 +
<!-- Pod2Wiki=item_is_secret_set -->
 +
====is_secret_set====
 +
 +
$boolean = $db-&gt;is_secret_set( $dataobj, $fieldname )
 +
Returns a boolean for whether the secret <tt>$fieldname</tt> for <tt>$dataobj</tt>  has a value set.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
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 +
</div>
 
<!-- Pod2Wiki=head_database_schema_manipulation -->
 
<!-- Pod2Wiki=head_database_schema_manipulation -->
===Database schema manipulation===
+
===Database Schema Manipulation===
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_has_sequence -->
 
<!-- Pod2Wiki=item_has_sequence -->
 
====has_sequence====
 
====has_sequence====
  
<source lang="perl">$boolean = $db->has_sequence( $name )
+
$boolean = $db-&gt;has_sequence( $name )
 
+
Returns <tt>true</tt> if a sequence of the given <tt>$name</tt> exists in the database. Otherwise, returns <tt>false</tt>.
</source>
 
Return true if a sequence of the given name exists in the database.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_create_sequence -->
 
<!-- Pod2Wiki=item_create_sequence -->
 
====create_sequence====
 
====create_sequence====
  
<source lang="perl">$success = $db->create_sequence( $seq_name )
+
$success = $db-&gt;create_sequence( $name )
 
+
Creates a new sequence object with <tt>$name</tt> and initialises to zero.
</source>
 
Creates a new sequence object initialised to zero.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_drop_sequence -->
 
<!-- Pod2Wiki=item_drop_sequence -->
 
====drop_sequence====
 
====drop_sequence====
  
<source lang="perl">$success = $db->drop_sequence( $seq_name )
+
$success = $db-&gt;drop_sequence( $name )
 
+
Deletes a sequence object with <tt>$name</tt>.
</source>
 
Deletes a sequence object.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_has_column -->
 
<!-- Pod2Wiki=item_has_column -->
 
====has_column====
 
====has_column====
  
<source lang="perl">$boolean = $db->has_column( $tablename, $columnname )
+
$boolean = $db-&gt;has_column( $table, $column )
 
+
Return <tt>true</tt> if the named <tt>$table</tt> has the named <tt>$column</tt> in the database.
</source>
 
Return true if the a table of the given name has a column named $columnname in the database.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_drop_column -->
 
<!-- Pod2Wiki=item_drop_column -->
 
====drop_column====
 
====drop_column====
  
<source lang="perl">$success = $db->drop_column( $table, $column )
+
$success = $db-&gt;drop_column( $table, $column )
 
+
Drops the named <tt>$column</tt> from the named <tt>$table</tt>.
</source>
 
Drops a column from a table.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_get_primary_key -->
 
<!-- Pod2Wiki=item_get_primary_key -->
 
====get_primary_key====
 
====get_primary_key====
  
<source lang="perl">@columns = $db->get_primary_key( $tablename )
+
@columns = $db-&gt;get_primary_key( $tablename )
 
+
Returns a list of column names that comprise the primary key for the <tt>$tablename</tt>.
</source>
 
Returns the list of column names that comprise the primary key for $tablename.
 
  
Returns empty list if no primary key exists.
+
Returns an empty list if no primary key exists.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<!-- Pod2Wiki=item_create_primary_key -->
+
</div>
====create_primary_key====
+
<!-- Pod2Wiki=item_index_name -->
 +
====index_name====
  
<source lang="perl">$db->create_primary_key( $tablename, @cols )
+
$name = $db-&gt;index_name( $table, @cols )
 +
Returns the name of the first index that starts with named columns  <tt>@cols</tt> in the named <tt>$table</tt>.
  
</source>
+
Returns <tt>undef</tt> if no index exists.
Create a PRIMARY KEY on $tablename over @cols.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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<!-- Pod2Wiki=item_index_name -->
+
</div>
====index_name====
+
<!-- Pod2Wiki=item_get_index_ids -->
 +
====get_index_ids====
  
<source lang="perl">$name = $db->index_name( $table, @columns )
+
$ids = $db-&gt;get_index_ids( $table, $condition )
 
+
Return a reference to an array of the distinct primary keys from the named SQL <tt>$table</tt> which match the specified <tt>$condition</tt>.
</source>
 
Returns the name of the first index that starts with @columns on the $table table.
 
 
 
Returns undef if no index exists.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_create_index -->
 
<!-- Pod2Wiki=item_create_index -->
 
====create_index====
 
====create_index====
  
<source lang="perl">$success = $db->create_index( $tablename, @columns )
+
$success = $db-&gt;create_index( $table, @columns )
 
+
Creates an index over <tt>@columns</tt> for named <tt>$table</tt>. Returns <tt>true</tt>  on success, <tt>false</tt> otherwise.
</source>
 
Creates an index over @columns for $tablename. Returns true on success.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_create_unique_index -->
 
<!-- Pod2Wiki=item_create_unique_index -->
 
====create_unique_index====
 
====create_unique_index====
  
<source lang="perl">$success = $db->create_unique_index( $tablename, @columns )
+
$success = $db-&gt;create_unique_index( $tablename, @columns )
 
+
Creates a unique index over <tt>@columns</tt> for named <tt>$table</tt>. Returns <tt>true</tt> on success, <tt>false</tt> otherwise.
</source>
 
Creates a unique index over @columns for $tablename. Returns true on success.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_create_foreign_key -->
 
<!-- Pod2Wiki=item_create_foreign_key -->
 
====create_foreign_key====
 
====create_foreign_key====
  
<source lang="perl">$ok = $db->create_foreign_key( $main_table, $aux_table, $key_field )
+
$ok = $db-&gt;create_foreign_key( $main_table, $table, $key_field )
 
+
Create a foreign key relationship between named <tt>$main_table</tt> and named <tt>$table</tt> using <tt>$key_field</tt>.
</source>
 
Create a foreign key relationship between $main_table and $aux_table using the $key_field.
 
  
This will cause records in $aux_table to be deleted if the equivalent record is deleted from $main_table.
+
This will cause records in <tt>$table</tt> to be deleted if the equivalent record is deleted from <tt>$main_table</tt>.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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 +
</div>
 
<!-- Pod2Wiki=item_get_tables -->
 
<!-- Pod2Wiki=item_get_tables -->
 
====get_tables====
 
====get_tables====
  
<source lang="perl">@tables = $db->get_tables
+
@tables = $db-&gt;get_tables( [ $dbname ] )
 +
Returns a list of all the tables in the database. 
  
</source>
+
<tt>$dbname</tt> specifies a particular database name of current connection has access to more than one database.
Return a list of all the tables in the database.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_has_table -->
 
<!-- Pod2Wiki=item_has_table -->
 
====has_table====
 
====has_table====
  
<source lang="perl">$boolean = $db->has_table( $tablename )
+
$boolean = $db-&gt;has_table( $tablename )
 
+
Returns boolean dependent on whether a table of the <tt>$tablename</tt>  exists in the database.
</source>
 
Return true if a table of the given name exists in the database.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_create_table -->
 
<!-- Pod2Wiki=item_create_table -->
 
====create_table====
 
====create_table====
  
<source lang="perl">$success = $db->create_table( $tablename, $setkey, @fields );
+
$success = $db-&gt;create_table( $tablename, $setkey, @fields );
 
+
Creates a new table with <tt>$tablename</tt> based on <tt>@fields</tt>.
</source>
 
Creates a new table $tablename based on @fields.
 
  
The first $setkey number of fields are used for a primary key.
+
The first <tt>$setkey</tt> number of fields are used for its primary key.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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</div>
 
<!-- Pod2Wiki=item_drop_table -->
 
<!-- Pod2Wiki=item_drop_table -->
 
====drop_table====
 
====drop_table====
  
<source lang="perl">$db->drop_table( $tablename [, $tablename2 ] )
+
$db-&gt;drop_table( @tables )
 
+
Delete the named <tt>@tables</tt>. Use with caution!
</source>
 
Delete the named table(s). Use with caution!
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
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 +
</div>
 
<!-- Pod2Wiki=item_rename_table -->
 
<!-- Pod2Wiki=item_rename_table -->
 
====rename_table====
 
====rename_table====
  
<source lang="perl">$db->rename_table( $tablename, $newtablename )
+
$db-&gt;rename_table( $table_from, $table_to )
 
+
Renames the table named <tt>$table_from</tt> to <tt>$table_to</tt>.
</source>
 
Renames the table from the old name to the new one.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_swap_table -->
 
<!-- Pod2Wiki=item_swap_table -->
 
====swap_table====
 
====swap_table====
  
<source lang="perl">$db->swap_table( $table_a, $table_b )
+
$db-&gt;swap_table( $table_a, $table_b )
 
+
Renames table named <tt>$table_a</tt> to <tt>$table_b</tt> and vice-versa.  
</source>
 
Swap table a and table b.  
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=head_eprints_schema_manipulation -->
 
<!-- Pod2Wiki=head_eprints_schema_manipulation -->
===EPrints schema manipulation===
+
===EPrints Schema Manipulation===
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_create_archive_tables -->
 
<!-- Pod2Wiki=item_create_archive_tables -->
 
====create_archive_tables====
 
====create_archive_tables====
  
<source lang="perl">$success = $db->create_archive_tables
+
$success = $db-&gt;create_archive_tables()
 
+
Create all the SQL tables for all datasets.
</source>
 
Create all the SQL tables for each dataset.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_drop_archive_tables -->
 
<!-- Pod2Wiki=item_drop_archive_tables -->
 
====drop_archive_tables====
 
====drop_archive_tables====
  
<source lang="perl">$db->drop_archive_tables()
+
$db-&gt;drop_archive_tables()
 
+
Destroy all tables used by EPrints in the database.
</source>
 
Destroy all tables used by eprints in the database.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_create_version_table -->
 
<!-- Pod2Wiki=item_create_version_table -->
 
====create_version_table====
 
====create_version_table====
  
<source lang="perl">$db->create_version_table
+
$db-&gt;create_version_table
 
+
Make the version table (and set the only value to be the current version of EPrints).
</source>
 
Make the version table (and set the only value to be the current version of eprints).
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_drop_version_table -->
 
<!-- Pod2Wiki=item_drop_version_table -->
 
====drop_version_table====
 
====drop_version_table====
  
<source lang="perl">$db->drop_version_table
+
$db-&gt;drop_version_table
 
 
</source>
 
 
Drop the version table.
 
Drop the version table.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_has_dataset -->
 
<!-- Pod2Wiki=item_has_dataset -->
 
====has_dataset====
 
====has_dataset====
  
<source lang="perl">$db->has_dataset( $dataset )
+
$db-&gt;has_dataset( $dataset )
 +
Returns <tt>true</tt> if <tt>$dataset</tt> exists in the database and has all  expected tables including ordervalues and index tables.
 +
 
 +
This does not check that all fields are configured - see &lt;/has_field&gt;.
 +
 
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 +
<!-- Edit below this comment -->
 +
 
  
</source>
+
<!-- Pod2Wiki= -->
Returns true if $dataset exists in the database or has no database tables.
+
</div>
 +
<!-- Pod2Wiki=item_has_dataset_index_tables -->
 +
====has_dataset_index_tables====
  
This does not check that all fields are configured - see has_field().
+
$db-&gt;has_dataset_index_tables( $dataset )
 +
Returns <tt>true</tt> if index tables for <tt>$dataset</tt> exists of if this is  not indexable.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
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 +
</div>
 
<!-- Pod2Wiki=item_create_dataset_tables -->
 
<!-- Pod2Wiki=item_create_dataset_tables -->
 
====create_dataset_tables====
 
====create_dataset_tables====
  
<source lang="perl">$success = $db->create_dataset_tables( $dataset )
+
$success = $db-&gt;create_dataset_tables( $dataset )
 +
Creates all the SQL tables for the specified <tt>$dataset</tt>.
 +
 
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 +
<!-- Edit below this comment -->
  
</source>
 
Create all the SQL tables for a single dataset.
 
  
Index tables are created in the dataset is indexable.
+
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_drop_dataset_tables -->
 +
====drop_dataset_tables====
  
Order values tables are created for each configured languaged if the dataset is ordered.
+
$db-&gt;drop_dataset_tables( $dataset )
 +
Drops all the SQL tables for the specified <tt>$dataset</tt>.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
<!-- Pod2Wiki=item_drop_dataset_tables -->
+
</div>
====drop_dataset_tables====
+
<!-- Pod2Wiki=item_create_dataset_index_tables -->
 +
====create_dataset_index_tables====
 +
 
 +
$success = $db-&gt;create_dataset_index_tables( $dataset )
 +
Creates all the index tables for the specified <tt>$dataset</tt>.
 +
 
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Edit below this comment -->
  
<source lang="perl">$db->drop_dataset_tables( $dataset )
 
  
</source>
+
<!-- Pod2Wiki= -->
Drop all the SQL tables for a single dataset.
+
</div>
 +
<!-- Pod2Wiki=item_create_dataset_ordervalues_tables -->
 +
====create_dataset_ordervalues_tables====
  
 +
$success = $db-&gt;create_dataset_ordervalues_tables( $dataset )
 +
Creates all the ordervalues tables for the specified <tt>$dataset</tt>.
 +
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 
<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_has_field -->
 
<!-- Pod2Wiki=item_has_field -->
 
====has_field====
 
====has_field====
  
<source lang="perl">$db->has_field( $dataset, $field )
+
$db-&gt;has_field( $dataset, $field )
 
+
Returns <tt>true</tt> if <tt>$field</tt> is in the database for <tt>$dataset</tt>.
</source>
 
Returns true if $field is in the database for $dataset.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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 +
</div>
 
<!-- Pod2Wiki=item_add_field -->
 
<!-- Pod2Wiki=item_add_field -->
 
====add_field====
 
====add_field====
  
<source lang="perl">$db->add_field( $dataset, $field [, $force ] )
+
$db-&gt;add_field( $dataset, $field, [ $force ] )
 +
Add <tt>$field</tt> to <tt>$dataset</tt>'s tables.
  
</source>
+
If <tt>$force</tt> is <tt>true</tt> modify/replace an existing column. Use with care!
Add $field to $dataset's tables.
 
 
 
If $force is true will modify/replace an existing column (use with care!).
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Edit below this comment -->
 
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_remove_field -->
 
<!-- Pod2Wiki=item_remove_field -->
 
====remove_field====
 
====remove_field====
  
<source lang="perl">$db->remove_field( $dataset, $field )
+
$db-&gt;remove_field( $dataset, $field )
 
+
Remove <tt>$field</tt> from <tt>$dataset</tt>'s tables.
</source>
 
Remove $field from $dataset's tables.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_rename_field -->
 
<!-- Pod2Wiki=item_rename_field -->
 
====rename_field====
 
====rename_field====
  
<source lang="perl">$ok = $db->rename_field( $dataset, $field, $old_name )
+
$ok = $db-&gt;rename_field( $dataset, $field, $old_name )
 
+
Rename the <tt>$field</tt> in the <tt>$dataset</tt> from its <tt>$old_name</tt>.
</source>
 
Rename a $field in the database from it's old name $old_name.
 
  
Returns true if the field was successfully renamed.
+
Returns <tt>true</tt> if the <tt>$field</tt> is successfully renamed.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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 +
</div>
 
<!-- Pod2Wiki=item_create_counters -->
 
<!-- Pod2Wiki=item_create_counters -->
 
====create_counters====
 
====create_counters====
  
<source lang="perl">$success = $db->create_counters
+
$success = $db-&gt;create_counters
 
+
Create the counters used to store the highest current ID of eprints, users, etc.
</source>
 
Create the counters used to store the highest current id of eprints, users etc.
 
  
 +
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 +
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<!-- Pod2Wiki= -->
 +
</div>
 
<!-- Pod2Wiki=item_has_counter -->
 
<!-- Pod2Wiki=item_has_counter -->
 
====has_counter====
 
====has_counter====
  
<source lang="perl">$success = $db->has_counter( $counter )
+
$success = $db-&gt;has_counter( $counter )
 
+
Returns <tt>true</tt> if <tt>$counter</tt> exists.
</source>
 
Returns true if $counter exists.
 
  
 +
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 +
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 +
</div>
 
<!-- Pod2Wiki=item_create_counter -->
 
<!-- Pod2Wiki=item_create_counter -->
 
====create_counter====
 
====create_counter====
  
<source lang="perl">$success = $db->create_counter( $name )
+
$success = $db-&gt;create_counter( $name )
 
+
Create and initialise to zero a new counter with <tt>$name</tt>.
</source>
 
Create and initialise to zero a new counter called $name.
 
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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</div>
 
<!-- Pod2Wiki=item_remove_counters -->
 
<!-- Pod2Wiki=item_remove_counters -->
 
====remove_counters====
 
====remove_counters====
  
<source lang="perl">$success = $db->remove_counters
+
$success = $db-&gt;remove_counters
 
 
</source>
 
 
Destroy all counters.
 
Destroy all counters.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Edit below this comment -->
 
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 +
</div>
 
<!-- Pod2Wiki=item_drop_counter -->
 
<!-- Pod2Wiki=item_drop_counter -->
 
====drop_counter====
 
====drop_counter====
  
<source lang="perl">$success = $db->drop_counter( $name )
+
$success = $db-&gt;drop_counter( $name )
 +
Destroy the counter named <tt>$name</tt>.
 +
 
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
<span style='display:none'>User Comments</span>
 +
<!-- Edit below this comment -->
  
</source>
 
Destroy the counter named $name.
 
  
 +
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=head_user_messages -->
 +
===User Messages===
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Pod2Wiki= -->
<!-- Pod2Wiki=head_see_also -->
+
</div>
==SEE ALSO==
+
<!-- Pod2Wiki=item_save_user_message -->
To access database-stored objects use the methods provided by the following modules: [[API:EPrints/Repository|EPrints::Repository]], [[API:EPrints/DataSet|EPrints::DataSet]].
+
====save_user_message====
 +
 
 +
$message = $db-&gt;save_user_message( $userid, $m_type, $dom_m_data )
 +
Save user message provided in XML DOM object <tt>$dom_m_data</tt> as a  sanitized string in a [[API:EPrints:DataObj/Message|EPrints:DataObj::Message]] using <tt>$m_type</tt> to  define the message type and <tt>$userid</tt> for the ID of the user whose message it is.
 +
 
 +
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 +
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 +
 
 +
 
 +
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=item_get_user_messages -->
 +
====get_user_messages====
 +
 
 +
@messages = $db-&gt;get_user_messages( $userid, %opts )
 +
Get the messages for a user with ID <tt>$userid</tt> and clear messages if <tt>$opt{clear}</tt> is set.
  
 +
<div style='background-color: #e8e8f; margin: 0.5em 0em 1em 0em; border: solid 1px #cce;  padding: 0em 1em 0em 1em; font-size: 80%; '>
 +
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
<!-- Pod2Wiki=head_copyright -->
+
</div>
==COPYRIGHT==
+
<!-- Pod2Wiki=item_clear_user_messages -->
Copyright 2000-2011 University of Southampton.
+
====clear_user_messages====
  
This file is part of EPrints http://www.eprints.org/.
+
$db-&gt;clear_user_messages( $userid )
 +
Clear all messages for user with ID <tt>$userid</tt>.
  
EPrints is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
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<!-- Edit below this comment -->
  
EPrints is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 
  
You should have received a copy of the GNU Lesser General Public License along with EPrints.  If not, see http://www.gnu.org/licenses/.
+
<!-- Pod2Wiki= -->
 +
</div>
 +
<!-- Pod2Wiki=head_see_also -->
 +
==SEE ALSO==
 +
To access database-stored objects use the methods provided by the  following modules: [[API:EPrints/Repository|EPrints::Repository]], [[API:EPrints/DataSet|EPrints::DataSet]].
  
 +
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<!-- Pod2Wiki= -->
 
<!-- Pod2Wiki= -->
<!-- Pod2Wiki=_postamble_ -->
+
</div>
 +
<!-- Pod2Wiki=head_copyright -->
 +
==COPYRIGHT==
 +
{{API:Copyright}}
 +
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<!-- Pod2Wiki=_postamble_ --><!-- Edit below this comment -->

Latest revision as of 23:41, 11 January 2022

EPrints 3 Reference: Directory Structure - Metadata Fields - Repository Configuration - XML Config Files - XML Export Format - EPrints data structure - Core API - Data Objects


API: Core API

Latest Source Code (3.4, 3.3) | Revision Log | Before editing this page please read Pod2Wiki


Contents

NAME

EPrints::Database - a connection to the SQL database for an eprints session.

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DESCRIPTION

EPrints Database Access Module

Provides access to the backend database. All database access done via this module, in the hope that the backend can be replaced as easily as possible.

In most use-cases it should not be necessary to use the database module directly. Instead you should use EPrints::DataSet or EPrints::MetaField accessor methods to access objects and field values respectively.

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Cross-database Support

Any use of SQL statements must use quote_identifier to quote database tables and columns and quote_value to quote values. The only exception to this are the EPrints::Database::* modules which provide database-driver specific extensions.

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Quoting SQL Values

By convention variables that contain already quoted values are prefixed with Q_ so they can be easily recognised when used in string interpolation:

my $Q_value = $db->quote_value( "Hello, World!" );
$db->do("SELECT $Q_value");
 

Where possible you should avoid quoting values yourself, instead use a method that accepts unquoted values which will (safely) do the work for you.

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CONSTANTS

All the SQL_ column types defined by Perl module DBI and the following:

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SQL_NULL

A column value is undefined.

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SQL_NOT_NULL

A column value is defined.

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INSTANCE VARIABLES

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$self->{session}

The EPrints::Session which is associated with this database connection.

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$self->{debug}

If true then SQL is logged.

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$self->{dbh}

The handle on the actual database connection.

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METHODS

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Database

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new

$db = EPrints::Database->new( $repo, [ %opts ] )

Create a connection to the database.

Options:

 db_connect - Boolean. Also connect to the database (default: true).

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create

$db = $db->create( $username, $password )

Create and connect to a new database using user account $username and $password.

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build_connection_string

$dbstr = EPrints::Database::build_connection_string( %params )

Build the string to use to connect to the database via DBI.

Parameters:

dbname - Database name (REQUIRED).
dbdriver - Database driver (e.g. mysql, Oracle, pgsql, default: mysql).
dbhost - Database host.  Assumes localhost if unset.
dbport - Port to connect to database host.  Assumes default for driver if unset.
dbsock - Socket file to connect to database through.

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connect

$db->connect()

Connects to the database.

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disconnect

$db->disconnect()

Disconnects from the EPrints database. Should always be done before any script exits.

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set_debug

$db->set_debug( $boolean )

Set the SQL debug mode to true or false.

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set_version

$db->set_version( $versionid );

Set the version id table in the SQL database to the given versionid (used by the upgrade script).

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get_version

$version = $db->get_version

Returns the current database schema version.

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is_latest_version

$boolean = $db->is_latest_version

Return true if the SQL tables are in the correct configuration for this edition of eprints. Otherwise, false.

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get_server_version

$version = $db->get_server_version

Return the database server version.

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get_default_charset

$charset = $db->get_default_charset

Return the character set to use.

Returns undef if character sets are unsupported.

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get_default_collation

$collation = $db->get_default_collation( $lang )

Return the collation to use for language $lang.

Returns undef if collation is unsupported.

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get_driver_name

$driver = $db->get_driver_name

Return the database driver name.

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error

$errstr = $db->error()

Return a string describing the last SQL error.

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retry_error

$boolean = $db->retry_error()

Returns a boolean for whether the database error is a retry error.

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duplicate_error

$boolean = $db->duplicate_error()

Returns a boolean for whether the database error is a duplicate error.

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begin

$db->begin()

Begin a transaction.

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commit

$db->commit()

Commit the previously begun transaction.

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rollback

$db->rollback()

Rollback the partially completed transaction.

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type_info

$type_info = $db->type_info( $data_type )

See DBI/type_info.

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get_column_type

$real_type = $db->get_column_type( $name, $data_type, $not_null, [ $length, $scale, %opts ] )

Returns a SQL column definition for $name of type $type, usually something like:

 $name $type($length,$scale) [ NOT NULL ]
 

If $not_null is true column will be set to NOT NULL.

$length and $scale control the maximum lengths of character or decimal types (see below).

Other options available to refine the column definition:

 langid - character set/collation to use
 sorted - whether this column will be used to order by
 

langid is mapped to real database values by the "dblanguages" configuration option. The database may not be able to order the request column type in which case, if sorted is true, the database may use a substitute column type.

$data_type is the SQL type. The types are constants defined by this module, to import them use:

 use EPrints::Database qw( :sql_types );
 

Supported types (n = requires $length argument):

Character data: SQL_VARCHAR(n), SQL_LONGVARCHAR, SQL_CLOB.

Binary data: SQL_VARBINARY(n), SQL_LONGVARBINARY.

Integer data: SQL_TINYINT, SQL_SMALLINT, SQL_INTEGER, SQL_BIGINT.

Floating-point data: SQL_REAL, SQL_DOUBLE.

Time data: SQL_DATE, SQL_TIME.

The actual column types used will be database-specific.

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Basic SQL Operations

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do

$success = $db->do( $sql )

Execute the given $sql.

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prepare

$sth = $db->prepare( $sql )

Prepare the given $sql and return a handle on it.

Use the execute method on the returned DBI handle to execute the SQL:

 my $sth = $db->prepare_select( "SELECT 'Hello, World'" );
 $sth->execute;
 

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prepare_select

$sth = $db->prepare_select( $sql, [ %options ] )

Prepare a SELECT statement $sql and return a handle to it. After preparing a statement use execute() to execute it.

Returns a DBI statement handle.

The LIMIT SQL keyword is not universally supported, to specify this use the limit option.

Options:

 limit - limit the number of rows returned
 offset - return limit number of rows after offset
 

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execute

$success = $db->execute( $sth, $sql )

Execute the SQL prepared earlier in the $sth. $sql is only required for debugging purposes.

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update

$success = $db->update( $dataset, $data, $changed )

Updates a EPrints::DataObj from $dataset with the given $data. The primary key field (e.g. eprintid) value must be included.

Updates the ordervalues if the $dataset is ordered.

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_update

$rows = $db->_update( $tablename, $keycols, $keyvals, $columns, @values )

Updates $columns in $tablename with @values where $keycols equals $keyvals and returns the number of rows affected.

N.B. If no rows are affected, the result is still true, see DBI's execute() method.

This is an internal method.

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insert

$success = $db->insert( $table, $columns, @values )

Inserts @values into the table $table. If $columns is defined it will be used as a list of columns to insert into. @values is a list of arrays containing values to insert. These will be quoted before insertion.

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insert_quoted

$success = $db->insert_quoted( $table, $columns, @qvalues )

Inserts values into the table $table. If $columns is defined it will be used as a list of columns to insert into. @qvalues is a list of arrays containing values to insert. These will NOT be quoted before insertion - care must be exercised!

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delete_from

$success = $db->delete_from( $table, $columns, @values )

Perform a SQL DELETE FROM $table using $columns to build a where clause. @values is a list of array references of values in the same order as $columns.

If you want to clear a table completely use clear_table().

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count_table

$n = $db->count_table( $tablename )

Return the number of rows in the specified SQL table with $tablename.

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clear_table

$db->clear_table( $tablename )

Clears all records from the given table with $tablename. Use with caution!

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Quoting

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prep_int

$mungedvalue = EPrints::Database::prep_int( $value )

Escape numerical $value for an SQL statement. undef becomes NULL. Anything else becomes a number (zero if needed).

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prep_value

$mungedvalue = EPrints::Database::prep_value( $value )

Escape $value for an SQL statement. Modify value such that " becomes \" and \ becomes \\ and ' becomes \'.

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prep_like_value

$mungedvalue = EPrints::Database::prep_like_value( $value )

Escape $value for an SQL LIKE clause. In addition to ' " and \ also escapes % and _.

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quote_value

$str = $db->quote_value( $value )

Return a quoted version of $value. To quote a LIKE value you should use:

$db->quote_value( EPrints::Database::prep_like_value( $foo ) . '%' );
 

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quote_int

$str = $db->quote_int( $value )

Return a quoted integer for $value.

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quote_binary

$str = $db->quote_binary( $bytes )

Some databases (Oracle/PostgreSQL) require transforms of binary data to work correctly.

This method should be called on data $bytes containing null bytes or back-slashes before being passed on quote_value.

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quote_ordervalue

$str = $db->quote_ordervalue( $field, $value )

Some databases (Oracle) can't order by CLOBs so need special treatment when creating the ordervalues tables. This method allows any fixing-up required for string data $value for $field before it's inserted.

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quote_identifier

$str = $db->quote_identifier( @parts )

Quote a database identifier (e.g. table names). Multiple @parts will be joined by dots (.).

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prepare_regexp

$sql = $db->prepare_regexp( $col, $value )

The syntax used for regular expressions varies across databases. This method takes two quoted string and returns a SQL expression that will apply the quoted regexp $value to the quoted column $col.

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sql_as

$sql = $db->sql_AS()

Returns the syntactic glue to use when aliasing. SQL 92 databases will happily use AS but some databases (Oracle) will not accept it.

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sql_like

$sql = $db->sql_LIKE()

Returns the syntactic glue to use when making a case-insensitive LIKE. PostgreSQL requires ILIKE while everything else uses LIKE and the column collation.

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Counters

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counter_current

$n = $db->counter_current( $counter )

Return the value of the previous counter_next on $counter.

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counter_next

$n = $db->counter_next( $counter )

Return the next unused value for the named $counter. Returns undef if the $counter doesn't exist.

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counter_minimum

$db->counter_minimum( $counter, $value )

Ensure that the $counter is set no lower than $value. This is used when importing eprints which may not be in scrict sequence.

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counter_reset

$db->counter_reset( $counter )

Reset the $counter. Use with caution.

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next_doc_pos

$n = $db->next_doc_pos( $eprintid )

Return the next unused document position for the given $eprintid.

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Dataset Data

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exists

$boolean = $db->exists( $dataset, $id )

Return true if there exists an EPrints::DataObj from the $dataset with its primary key set to $id. Otherwise, return false.

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add_record

$success = $db->add_record( $dataset, $data )

Add the given $data as a new record in the given $dataset. $data is a reference to a hash containing values structured for a record in the that $dataset.

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remove

$success = $db->remove( $dataset, $id )

Attempts to remove the EPrints::DataObj with the primary key $id from the specified $dataset.

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Searching, caching and object retrieval

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cache_exp

$searchexp = $db->cache_exp( $cacheid )

Return the serialised search of a the cached search with $cacheid. Return undef if the $cacheid is invalid or expired.

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cache

$cacheid = $db->cache( $searchexp, $dataset, $srctable, [$order], [$list] )

Create a cache of the specified search expression from the SQL table $srctable.

If $order is set then the cache is ordered by the specified fields. For example -year/title orders by year (descending). Records with the same year are ordered by title.

If $srctable is set to LIST then order is ignored and the list of IDs is taken from the array reference $list.

If $srctable is set to ALL every matching record from $dataset is added to the cache, optionally ordered by $order.

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cache_table

$tablename = $db->cache_table( $id )

Return the name of the SQL table used to store the cache with $id.

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cache_userid

$userid = $db->cache_userid( $id )

Returns the userid associated with the cache with $id if that cache exists.

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get_cachemap

$cachemap = $db->get_cachemap( $id )

Return the cachemap with $<id>.

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search

$ids = $db->search( $keyfield, $tables, $conditions, [ $main_table_alias ] )

Return a reference to an array of $keyfield IDs - the results of the search specified by $conditions across the tables specified in the $tables hash where keys are tables aliases and values are table names.

If no $main_table_alias is specified then M is assumed.

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drop_cache

$db->drop_cache( $id )

Remove the cached search with the given $id.

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from_cache

$items = $db->from_cache( $dataset, $cacheid, [ $offset, $count, $justids ] )

Return a reference to an array containing all the items from the given $dataset that have IDs in the cache specified by $cacheid. The cache may be specified either by ID or serialised search expression.

$offset is an offset from the start of the cache and $count is the number of records to return.

If $justids is true then it returns just a reference to an array of the record IDs and not the objects themselves.

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drop_orphan_cache_tables

$c = $db->drop_orphan_cache_tables

Drop tables called cacheXXX where XXX is an integer. Returns the number of cache tables dropped.

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get_single

$obj = $db->get_single( $dataset, $id )

Return a single <EPrints::DataObj> from the given $dataset with primary key set to $id.

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get_all

$items = $db->get_all( $dataset )

Returns a reference to an array with all the <EPrints::DataObj>s from the given $dataset.

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get_cache_ids

@ids = $db->get_cache_ids( $dataset, $cachemap, $offset, $count )

Returns a list of $count IDs from $cache_id starting at $offset and in the order in the $cachemap.

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get_dataobjs

@dataobjs = $db->get_dataobjs( $dataset, [ $id, $id, ... ] )

Retrieves the records in $dataset with the given $id(s). If an $id doesn't exist in the database it will be ignored.

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get_values

$values = $db->get_values( $field, $dataset )

Return a reference to an array of all the distinct values of the EPrints::MetaField $field for the $dataset specified.

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sort_values

$values = $db->sort_values( $field, $values, [ $langid ] )

Sorts and returns the list of $values using the database.

$field is used to get the order value for each value. $langid (or $session->get_langid if unset) is used to determine the database collation to use when sorting the resulting order values.

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get_ids_by_field_values

$ids = $db->get_ids_by_field_values( $field, $dataset, [ %opts ] )

Return a reference to a hash table where the keys are specified $datasets's $field value IDs and the values are references to arrays of IDs.

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dequeue_events

@events = $db->dequeue_events( $n )

Attempt to dequeue upto $n events. May return between 0 and $n events depending on parallel processes and how many events are remaining in the queue.

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ci_lookup

$value = $db->ci_lookup( $field, $value )

This is a hacky method to support case-insensitive lookup for usernames, emails, etc. It returns the actual case-sensitive version of $value if there is a case-insensitive match for the $field.

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Password Validation and Secret Fields

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valid_login

$db->valid_login( $username, $password )

Returns whether the clear-text $password matches the stored crypted password for the $username.

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secret_matches

$db->secret_matches( $dataobj, $fieldname, $token [, $callback ] )

Returns whether the clear-text $token matches the stored crypted field with $fieldname for the $dataobj according to the $callback function.

If not set, $callback defaults to EPrints::Utils#crypt_equals.

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is_secret_set

$boolean = $db->is_secret_set( $dataobj, $fieldname )

Returns a boolean for whether the secret $fieldname for $dataobj has a value set.

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Database Schema Manipulation

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has_sequence

$boolean = $db->has_sequence( $name )

Returns true if a sequence of the given $name exists in the database. Otherwise, returns false.

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create_sequence

$success = $db->create_sequence( $name )

Creates a new sequence object with $name and initialises to zero.

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drop_sequence

$success = $db->drop_sequence( $name )

Deletes a sequence object with $name.

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has_column

$boolean = $db->has_column( $table, $column )

Return true if the named $table has the named $column in the database.

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drop_column

$success = $db->drop_column( $table, $column )

Drops the named $column from the named $table.

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get_primary_key

@columns = $db->get_primary_key( $tablename )

Returns a list of column names that comprise the primary key for the $tablename.

Returns an empty list if no primary key exists.

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index_name

$name = $db->index_name( $table, @cols )

Returns the name of the first index that starts with named columns @cols in the named $table.

Returns undef if no index exists.

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get_index_ids

$ids = $db->get_index_ids( $table, $condition )

Return a reference to an array of the distinct primary keys from the named SQL $table which match the specified $condition.

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create_index

$success = $db->create_index( $table, @columns )

Creates an index over @columns for named $table. Returns true on success, false otherwise.

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create_unique_index

$success = $db->create_unique_index( $tablename, @columns )

Creates a unique index over @columns for named $table. Returns true on success, false otherwise.

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create_foreign_key

$ok = $db->create_foreign_key( $main_table, $table, $key_field )

Create a foreign key relationship between named $main_table and named $table using $key_field.

This will cause records in $table to be deleted if the equivalent record is deleted from $main_table.

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get_tables

@tables = $db->get_tables( [ $dbname ] )

Returns a list of all the tables in the database.

$dbname specifies a particular database name of current connection has access to more than one database.

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has_table

$boolean = $db->has_table( $tablename )

Returns boolean dependent on whether a table of the $tablename exists in the database.

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create_table

$success = $db->create_table( $tablename, $setkey, @fields );

Creates a new table with $tablename based on @fields.

The first $setkey number of fields are used for its primary key.

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drop_table

$db->drop_table( @tables )

Delete the named @tables. Use with caution!

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rename_table

$db->rename_table( $table_from, $table_to )

Renames the table named $table_from to $table_to.

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swap_table

$db->swap_table( $table_a, $table_b )

Renames table named $table_a to $table_b and vice-versa.

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EPrints Schema Manipulation

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create_archive_tables

$success = $db->create_archive_tables()

Create all the SQL tables for all datasets.

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drop_archive_tables

$db->drop_archive_tables()

Destroy all tables used by EPrints in the database.

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create_version_table

$db->create_version_table

Make the version table (and set the only value to be the current version of EPrints).

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drop_version_table

$db->drop_version_table

Drop the version table.

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has_dataset

$db->has_dataset( $dataset )

Returns true if $dataset exists in the database and has all expected tables including ordervalues and index tables.

This does not check that all fields are configured - see </has_field>.

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has_dataset_index_tables

$db->has_dataset_index_tables( $dataset )

Returns true if index tables for $dataset exists of if this is not indexable.

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create_dataset_tables

$success = $db->create_dataset_tables( $dataset )

Creates all the SQL tables for the specified $dataset.

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drop_dataset_tables

$db->drop_dataset_tables( $dataset )

Drops all the SQL tables for the specified $dataset.

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create_dataset_index_tables

$success = $db->create_dataset_index_tables( $dataset )

Creates all the index tables for the specified $dataset.

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create_dataset_ordervalues_tables

$success = $db->create_dataset_ordervalues_tables( $dataset )

Creates all the ordervalues tables for the specified $dataset.

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has_field

$db->has_field( $dataset, $field )

Returns true if $field is in the database for $dataset.

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add_field

$db->add_field( $dataset, $field, [ $force ] )

Add $field to $dataset's tables.

If $force is true modify/replace an existing column. Use with care!

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remove_field

$db->remove_field( $dataset, $field )

Remove $field from $dataset's tables.

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rename_field

$ok = $db->rename_field( $dataset, $field, $old_name )

Rename the $field in the $dataset from its $old_name.

Returns true if the $field is successfully renamed.

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create_counters

$success = $db->create_counters

Create the counters used to store the highest current ID of eprints, users, etc.

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has_counter

$success = $db->has_counter( $counter )

Returns true if $counter exists.

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create_counter

$success = $db->create_counter( $name )

Create and initialise to zero a new counter with $name.

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remove_counters

$success = $db->remove_counters

Destroy all counters.

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drop_counter

$success = $db->drop_counter( $name )

Destroy the counter named $name.

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User Messages

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save_user_message

$message = $db->save_user_message( $userid, $m_type, $dom_m_data )

Save user message provided in XML DOM object $dom_m_data as a sanitized string in a EPrints:DataObj::Message using $m_type to define the message type and $userid for the ID of the user whose message it is.

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get_user_messages

@messages = $db->get_user_messages( $userid, %opts )

Get the messages for a user with ID $userid and clear messages if $opt{clear} is set.

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clear_user_messages

$db->clear_user_messages( $userid )

Clear all messages for user with ID $userid.

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SEE ALSO

To access database-stored objects use the methods provided by the following modules: EPrints::Repository, EPrints::DataSet.

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COPYRIGHT

© Copyright 2022 University of Southampton.

EPrints 3.4 is supplied by EPrints Services.

http://www.eprints.org/eprints-3.4/

LICENSE

This file is part of EPrints 3.4 http://www.eprints.org/.

EPrints 3.4 and this file are released under the terms of the GNU Lesser General Public License version 3 as published by the Free Software Foundation unless otherwise stated.

EPrints 3.4 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with EPrints 3.4. If not, see http://www.gnu.org/licenses/.

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