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<?php |
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/** |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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* @ingroup Maintenance |
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*/ |
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/** |
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* When using shared tables that are referenced by foreign keys on local |
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* tables you have to change the constraints on local tables. |
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* |
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* The shared tables have to have GRANT REFERENCE on shared tables to local schema |
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* i.e.: GRANT REFERENCES (user_id) ON mwuser TO hubclient; |
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*/ |
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require_once __DIR__ . '/../Maintenance.php'; |
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class AlterSharedConstraints extends Maintenance { |
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public function __construct() { |
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parent::__construct(); |
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$this->addDescription( 'Alter foreign key to reference master tables in shared database setup.' ); |
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} |
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public function getDbType() { |
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return Maintenance::DB_ADMIN; |
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} |
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public function execute() { |
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global $wgSharedDB, $wgSharedTables, $wgSharedPrefix, $wgDBprefix; |
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if ( $wgSharedDB == null ) { |
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$this->output( "Database sharing is not enabled\n" ); |
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return; |
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} |
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$dbw = $this->getDB( DB_MASTER ); |
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foreach ( $wgSharedTables as $table ) { |
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$stable = $dbw->tableNameInternal( $table ); |
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if ( $wgSharedPrefix != null ) { |
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$ltable = preg_replace( "/^$wgSharedPrefix(.*)/i", "$wgDBprefix\\1", $stable ); |
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} else { |
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$ltable = "{$wgDBprefix}{$stable}"; |
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} |
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$result = $dbw->query( "SELECT uc.constraint_name, uc.table_name, ucc.column_name, |
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uccpk.table_name pk_table_name, uccpk.column_name pk_column_name, |
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uc.delete_rule, uc.deferrable, uc.deferred |
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FROM user_constraints uc, user_cons_columns ucc, user_cons_columns uccpk |
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WHERE uc.constraint_type = 'R' |
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AND ucc.constraint_name = uc.constraint_name |
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AND uccpk.constraint_name = uc.r_constraint_name |
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AND uccpk.table_name = '$ltable'" ); |
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while ( ( $row = $result->fetchRow() ) !== false ) { |
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$this->output( "Altering {$row['constraint_name']} ..." ); |
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try { |
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$dbw->query( "ALTER TABLE {$row['table_name']} |
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DROP CONSTRAINT {$wgDBprefix}{$row['constraint_name']}" ); |
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} catch ( DBQueryError $exdb ) { |
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if ( $exdb->errno != 2443 ) { |
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throw $exdb; |
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} |
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} |
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$deleteRule = $row['delete_rule'] == 'NO ACTION' ? '' : "ON DELETE {$row['delete_rule']}"; |
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$dbw->query( "ALTER TABLE {$row['table_name']} |
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ADD CONSTRAINT {$wgDBprefix}{$row['constraint_name']} |
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FOREIGN KEY ({$row['column_name']}) |
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REFERENCES {$wgSharedDB}.$stable({$row['pk_column_name']}) |
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{$deleteRule} {$row['deferrable']} INITIALLY {$row['deferred']}" ); |
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$this->output( "DONE\n" ); |
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} |
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} |
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} |
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} |
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$maintClass = "AlterSharedConstraints"; |
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require_once RUN_MAINTENANCE_IF_MAIN; |
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wikimedia /
mediawiki
Loading history...
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.