Editing API:EPrints/Database/Oracle (section)

==METHODS==
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===connect===

 $db-&gt;connect()
Connects to the database.  Also sets <tt>LongReadLen</tt> to <tt>128*1024</tt>.

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===prepare_select===

 $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.

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:

    limit - limit the number of rows returned
    offset - return '''limit''' number of rows after offset
  
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===create_archive_tables===

 $success = $db-&gt;create_archive_tables()
Creates all the SQL tables for all datasets.

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===get_server_version===

 $version = $db-&gt;get_server_version
Returns the database server version.

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<!-- Pod2Wiki=item_get_column_type -->
===get_column_type===

 $real_type = $db-&gt;get_column_type( $name, $type, $not_null, [ $length ] )
Returns a SQL column definition for <tt>$name</tt> of type <tt>$type</tt>. If  <tt>$not_null</tt> is <tt>true</tt> the column will be set to <tt>NOT NULL</tt>. For  column types that require a length use <tt>$length</tt>.

<tt>$type</tt> 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: <tt>SQL_VARCHAR(n)</tt>, <tt>SQL_LONGVARCHAR</tt>.

Binary data: <tt>SQL_VARBINARY(n)</tt>, <tt>SQL_LONGVARBINARY</tt>.

Integer data: <tt>SQL_TINYINT</tt>, <tt>SQL_SMALLINT</tt>, <tt>SQL_INTEGER</tt>, 

Floating-point data: <tt>SQL_REAL</tt>, <tt>SQL_DOUBLE</tt>.

Time data: <tt>SQL_DATE</tt>, <tt>SQL_TIME</tt>.

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===get_tables===

 @tables = $db-&gt;get_tables
Return a list of all the tables in the database.

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<!-- Pod2Wiki=item_has_sequence -->
===has_sequence===

 $boolean = $db-&gt;has_sequence( $name )
Return <tt>true</tt> if a sequence of the given $&lt;name&gt; exists in the  database.

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<!-- Pod2Wiki=item_has_column -->
===has_column===

 $boolean = $db-&gt;has_column( $table, $column )
Return <tt>true</tt> if the named database <tt>$table</tt> has the named  <tt>$column</tt>.

Default method from [[API:EPrints/Database|EPrints::Database]] this is really slow and this  is much faster.

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<!-- Pod2Wiki=item_has_table -->
===has_table===

 $boolean = $db-&gt;has_table( $table )
Returns boolean dependent on whether the named <tt>$table</tt> exists in the  database.

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<!-- Pod2Wiki=item_counter_current -->
===counter_current===

 $n = $db-&gt;counter_current( $counter )
Return the value of the previous counter_next on <tt>$counter</tt>.

Oracle doesn't support getting the <tt>current</tt> value of a sequence so this method always returns <tt>undef</tt>.

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<!-- Pod2Wiki=item_quote_identifier -->
===quote_identifier===

 $id = $db-&gt;quote_identifier( @columns )
This method quotes and returns the given database identifier. If more  than one name is supplied joins them using the correct database  joining character (typically <tt>.</tt>).

Oracle restricts identifiers to:

   30 chars long
   start with a letter [a-z]
   { [a-z0-9], $, _, # }
   case insensitive
   not a reserved word (unless quoted?)
  
Identifiers longer than 30 characters will be abbreviated to the first  5 characters of the identifier and 25 characters from an MD5 derived  from the identifier. This should make name collisions unlikely.

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<!-- Pod2Wiki=item_prepare_regexp -->
===prepare_regexp===

 $sql = $db-&gt;prepare_regexp( $col, $value )
Oracle use the syntax:

 REGEXP_LIKE ($col, $value)
 
For the quoted regexp <tt>$value</tt> and the quoted column <tt>$col</tt>.

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<!-- Pod2Wiki=item_quote_binary -->
===quote_binary===

 $str = $db-&gt;quote_binary( $value )
Oracle requires transforms of binary data to work correctly.

This method should be called on data <tt>$value</tt> containing null bytes or back-slashes before being passed on [[API:EPrints/Database/Oracle#quote_value|quote_value]].

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<!-- Pod2Wiki=item_quote_ordervalue -->
===quote_ordervalue===

 $str = $db-&gt;quote_ordervalue( $field, $value )
Oracle can't order by <tt>CLOB</tt>S so need special treatment when creating  the ordervalues tables. This method fixes up <tt>$value</tt> to limit it to  1000 characters (4000 bytes) or returns <tt>undef</tt> if <tt>$value</tt> is not  defined.

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<!-- Pod2Wiki=item_index_name -->
===index_name===

 $name = $db-&gt;index_name( $table, @cols )
Should return the name of the first index that starts with named  columns <tt>@cols</tt> in the named <tt>$table</tt>. However, this is not  supported by Oracle so always returns <tt>1</tt>.

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<!-- Pod2Wiki=item_sql_as -->
===sql_as===

 $sql = $db-&gt;sql_AS()
Returns the syntactic glue to use when aliasing. Oracle does not  require a phrase so just returns a space character.

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<!-- Pod2Wiki=item_retry_error -->
===retry_error===

 $boolean = $db-&gt;retry_error()
Returns a boolean for whether the database error is a retry error. Based on whether {{API:PodLink|file=DBI#err|package_name=DBI#err|section=|text=DBI#err}} code is <tt>3113</tt> or <tt>3114</tt>.

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<!-- Pod2Wiki=item_type_info -->
===type_info===

 $type_info = $db-&gt;type_info( $data_type )
See {{API:PodLink|file=DBI|package_name=DBI|section=type_info|text=DBI/type_info}}.  Oracle has is own type information mappings.

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