deleteSelfExternals.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class DeleteSelfExternals extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = 'Delete self-references to $wgServer from externallinks';
        $this->mBatchSize = 1000;
    }

    public function execute() {
        global $wgServer;
        $this->output( "Deleting self externals from $wgServer\n" );
        $db = wfGetDB( DB_MASTER );
        while ( 1 ) {
            wfWaitForSlaves();
            $db->commit( __METHOD__ );
            $q = $db->limitResult( "DELETE /* deleteSelfExternals */ FROM externallinks WHERE el_to"
                . $db->buildLike( $wgServer . '/', $db->anyString() ), $this->mBatchSize );
            $this->output( "Deleting a batch\n" );
            $db->query( $q );
            if ( !$db->affectedRows() ) {
                return;
            }
        }
    }
}

$maintClass = "DeleteSelfExternals";
require_once RUN_MAINTENANCE_IF_MAIN;