Difference between revisions of "Text field"
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== Description == | == Description == | ||
| − | |||
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. | ||
| − | == Properties == | + | == Inheritance == |
| + | * [[Metadata]] | ||
| + | ** [[Id field]] | ||
| + | *** [[Text field]] | ||
| + | |||
| + | == Additional Properties == | ||
| + | As for [[Id field#Additional_Properties|Id fields]] except for | ||
{| border="1" cellpadding="3" cellspacing="0" | {| border="1" cellpadding="3" cellspacing="0" | ||
| − | + | ! Name !! Default Value !! Required !! Description !! Notes | |
|- | |- | ||
| − | | ''' | + | | '''match''' || <tt>IN</tt> || NO || How to match values in search results. || Different from [[Id field]] default (<tt>EX</tt>). Treat the search value as a list of whitespace-separated words rather than an exact single string to match. |
|- | |- | ||
| − | | ''' | + | | '''sql_index''' || <tt>0</tt> || NO || Whether field should be index for quicker lookup by the database. || Different from [[Id field]] default (<tt>1</tt>). |
| + | |- | ||
| + | | '''text_index''' || <tt>1</tt> || NO || Whether the text for this field should be indexed. || Different from [[Metadata]] default (<tt>0</tt>). | ||
|} | |} | ||
== Required Phrases == | == Required Phrases == | ||
| + | No additional phrases beyond those required for [[Id field#Required_Phrases|Id fields]]. | ||
| + | |||
| + | == Database == | ||
| + | Text fields are stored in the database as | ||
| + | |||
| + | 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, | ||
| + | }, | ||
Latest revision as of 13:27, 16 April 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
Contents
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
Additional Properties
As for Id fields except for
| Name | Default Value | Required | Description | Notes |
|---|---|---|---|---|
| match | IN | NO | How to match values in search results. | Different from Id field default (EX). Treat the search value as a list of whitespace-separated words rather than an exact single string to match. |
| sql_index | 0 | NO | Whether field should be index for quicker lookup by the database. | Different from Id field default (1). |
| text_index | 1 | NO | Whether the text for this field should be indexed. | Different from Metadata default (0). |
Required Phrases
No additional phrases beyond those required for Id fields.
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,
},
