Difference between revisions of "Text field"
(Add examples and link to API page. Moved description to top) |
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{{fieldtypes}} | {{fieldtypes}} | ||
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== Description == | == Description == | ||
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This is a very simple type of metadata field, which is used as a basis for several others. | This is a very simple type of metadata field, which is used as a basis for several others. | ||
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Note that 255 bytes does not mean 255 characters! UTF-8 can use 1 to 4 bytes to store a character. ASCII characters (a-z,0-9 etc) only use 1 byte so it will store 255 ASCII characters, but less of latin and much less of chinese. | Note that 255 bytes does not mean 255 characters! UTF-8 can use 1 to 4 bytes to store a character. ASCII characters (a-z,0-9 etc) only use 1 byte so it will store 255 ASCII characters, but less of latin and much less of chinese. | ||
| + | |||
| + | == Inheritance == | ||
| + | * [[Metadata]] | ||
| + | ** [[Text field]] | ||
== Properties == | == Properties == | ||
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{| border="1" cellpadding="3" cellspacing="0" | {| border="1" cellpadding="3" cellspacing="0" | ||
| name || default || description | | name || default || description | ||
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== Required Phrases == | == Required Phrases == | ||
| − | + | No additional phrases. | |
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== Database == | == Database == | ||
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Text fields are stored in the database as | Text fields are stored in the database as | ||
fieldname VARCHAR(255) | fieldname VARCHAR(255) | ||
| + | |||
| + | == API == | ||
| + | See [[API:EPrints/MetaField/Text|API page]]. | ||
| + | |||
| + | == Examples == | ||
| + | Most basic example. | ||
| + | { | ||
| + | name => 'publisher', | ||
| + | type => 'text', | ||
| + | }, | ||
| + | Allow multiple values. | ||
| + | { | ||
| + | name => 'corp_creators', | ||
| + | type => 'text', | ||
| + | multiple => 1, | ||
| + | }, | ||
| + | Create an index in the SQL database table. | ||
| + | { | ||
| + | name => 'publisher', | ||
| + | type => 'text', | ||
| + | sql_index => 1, | ||
| + | }, | ||
| + | Do not allow to be indexed for search. | ||
| + | { | ||
| + | name => 'private', | ||
| + | type => 'text', | ||
| + | text_index => 0, | ||
| + | }, | ||
Revision as of 08:32, 21 March 2023
EPrints 3 Reference: Directory Structure - Metadata Fields - Repository Configuration - XML Config Files - XML Export Format - EPrints data structure - Core API - Data Objects
Metadata Fields: Arclanguage - Base64 - Bigint - Boolean - Compound - Counter - Dataobjref - Date - Decimal - Email - Fields - Float - Id - Idci - Image - Int - Itemref - Keywords - Langid - Longtext - Longtext_counter - Multilang - Multipart - Name - Namedset - Pagerange - Recaptcha - Relation - Search - Secret - Set - Storable - Subject - Subobject - Text - Time - Timestamp - Url - Uuid
Description
This is a very simple type of metadata field, which is used as a basis for several others.
It stores a string of text. The maximum possible length of the string is 255 bytes.
Note that 255 bytes does not mean 255 characters! UTF-8 can use 1 to 4 bytes to store a character. ASCII characters (a-z,0-9 etc) only use 1 byte so it will store 255 ASCII characters, but less of latin and much less of chinese.
Inheritance
Properties
| name | default | description |
| sql_index | 0 | as for Metadata but with a different default. |
| text_index | 1 | as for Metadata but with a different default. |
Required Phrases
No additional phrases.
Database
Text fields are stored in the database as
fieldname VARCHAR(255)
API
See API page.
Examples
Most basic example.
{
name => 'publisher',
type => 'text',
},
Allow multiple values.
{
name => 'corp_creators',
type => 'text',
multiple => 1,
},
Create an index in the SQL database table.
{
name => 'publisher',
type => 'text',
sql_index => 1,
},
Do not allow to be indexed for search.
{
name => 'private',
type => 'text',
text_index => 0,
},
