MysqlDatabaseCreator.php

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<?php
 
namespace MediaWiki\Installer;
 
use MediaWiki\Status\Status;
use Wikimedia\Rdbms\IDatabase;
 
class MysqlDatabaseCreator extends NetworkedDatabaseCreator {
    protected function existsInConnection( IDatabase $conn, $database ) {
        return (bool)$conn->newSelectQueryBuilder()
            ->select( '1' )
            ->from( 'information_schema.schemata' )
            ->where( [ 'schema_name' => $database ] )
            ->caller( __METHOD__ )
            ->fetchRow();
    }
 
    protected function createInConnection( IDatabase $conn, $database ): Status {
        $encDatabase = $conn->addIdentifierQuotes( $database );
        $conn->query( "CREATE DATABASE IF NOT EXISTS $encDatabase", __METHOD__ );
        return Status::newGood();
    }
}