Manual:DatabaseUpdater.php

DatabaseUpdater is the class for handling database updates (e.g. adding, modifying, and dropping database tables, fields, and indexes). MysqlUpdater.php , PostgresUpdater.php , and SqliteUpdater.php extend this class, and all of those files (as well as the tables.sql files for the various database types) potentially need to be revised when a core schema change is made. Extensions usually change the schema by means of LoadExtensionSchemaUpdates hook functions. Either way, SQL patch file(s) need to be created.

• addExtensionField( $tableName, $columnName, $sqlPath )
• addExtensionIndex( $tableName, $indexName, $sqlPath )
• addExtensionTable( $tableName, $sqlPath )
• addExtensionUpdate( array $update )
• addPostDatabaseUpdateMaintenance( $class )
• doUpdates( array $what = [ 'core', 'extensions', 'stats' ] )
• dropExtensionField( $tableName, $columnName, $sqlPath )
• dropExtensionIndex( $tableName, $indexName, $sqlPath )
• dropExtensionTable( $tableName, $sqlPath = false )
• getDB()
• getPostDatabaseUpdateMaintenance()
• getSchemaVars()
• insertUpdateRow( $key, $val = null )
• modifyExtensionField( $tableName, $fieldName, $sqlPath )
• modifyExtensionTable( $tableName, $sqlPath )
• output( $str )
• patchPath( IDatabase $db, $patch )
• purgeCache()
• renameExtensionIndex( $tableName, $oldIndexName, $newIndexName,
• setAutoExtensionHookContainer( HookContainer $hookContainer )
• setFileAccess()
• tableExists( $tableName )
• updateRowExists( $key )