Manuel:table linktarget

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Schéma de base de données MédiaWiki

table linktarget

Version de MediaWiki :

≥ 1.38

This table stores a page namespace-title tuples, each one with a unique integer ID. This table is used for referenced page titles in tables that track links to pages: templatelinks , pagelinks tables.

This table contains immutable rows, which means only new rows are inserted, and never deleted or updated during normal wiki operation. However, the pruneUnusedLinkTargetRows.php maintenance script can be run to delete unused entries.

Access to this table from code is handled by instances of the class MediaWiki\Linker\LinkTargetLookup interface.

During schema migration, this table is filled using the migrateLinksTable.php maintenance script. $wgTemplateLinksSchemaMigrationStage controls whether data is read/written to this table.

Champs

lt_id

Clé primaire.

lt_namespace

Espace de noms du lien cible.

lt_title

Partie textuelle du lien cible sans l'espace de noms.

Résumé du schéma

Version de MediaWiki :

≥ 1.38

DESCRIBE linktarget;

+--------------+---------------------+------+-----+---------+----------------+
| Field        | Type                | Null | Key | Default | Extra          |
+--------------+---------------------+------+-----+---------+----------------+
| lt_id        | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| lt_namespace | int(11)             | NO   | MUL | NULL    |                |
| lt_title     | varbinary(255)      | NO   |     | NULL    |                |
+--------------+---------------------+------+-----+---------+----------------+

Les index

Version de MediaWiki :

≥ 1.38 Gerrit change 754989

SHOW INDEX IN linktarget;

+------------+------------+--------------------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table      | Non_unique | Key_name           | Seq_in_index | Column_name  | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+------------+------------+--------------------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| linktarget |          0 | PRIMARY            |            1 | lt_id        | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| linktarget |          0 | lt_namespace_title |            1 | lt_namespace | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| linktarget |          0 | lt_namespace_title |            2 | lt_title     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
+------------+------------+--------------------+--------------+--------------+-----------+-------------+----------+--------+------+------------+---------+---------------+