+
+ public static function setSchemaAliases( LBFactory $lbFactory, Config $config ) {
+ if ( $config->get( 'DBtype' ) === 'mysql' ) {
+ /**
+ * When SQLite indexes were introduced in r45764, it was noted that
+ * SQLite requires index names to be unique within the whole database,
+ * not just within a schema. As discussed in CR r45819, to avoid the
+ * need for a schema change on existing installations, the indexes
+ * were implicitly mapped from the new names to the old names.
+ *
+ * This mapping can be removed if DB patches are introduced to alter
+ * the relevant tables in existing installations. Note that because
+ * this index mapping applies to table creation, even new installations
+ * of MySQL have the old names (except for installations created during
+ * a period where this mapping was inappropriately removed, see
+ * T154872).
+ */
+ $lbFactory->setIndexAliases( [
+ 'ar_usertext_timestamp' => 'usertext_timestamp',
+ 'un_user_id' => 'user_id',
+ 'un_user_ip' => 'user_ip',
+ ] );
+ }
+ }
+
+ /**
+ * Log a database deprecation warning
+ * @param string $msg Deprecation message
+ */
+ public static function logDeprecation( $msg ) {
+ global $wgDevelopmentWarnings;
+
+ if ( isset( self::$loggedDeprecations[$msg] ) ) {
+ return;
+ }
+ self::$loggedDeprecations[$msg] = true;
+
+ if ( $wgDevelopmentWarnings ) {
+ trigger_error( $msg, E_USER_DEPRECATED );
+ }
+ wfDebugLog( 'deprecated', $msg, 'private' );
+ }