core-bundle/src/Resources/contao/library/Contao/Database.php
public function lockTables($arrTables)
	{
		$arrLocks = array();

		foreach ($arrTables as $table=>$mode)
		{
			$arrLocks[] = $this->resConnection->quoteIdentifier($table) . ' ' . $mode;
		}

		$this->resConnection->exec('LOCK TABLES ' . implode(', ', $arrLocks) . ';');
	}
public function lockTables($arrTables)
	{
		$arrLocks = array();

		foreach ($arrTables as $table=>$mode)
		{
			$arrLocks[] = $this->resConnection->quoteIdentifier($table) . ' ' . $mode;
		}

		$this->resConnection->exec('LOCK TABLES ' . implode(', ', $arrLocks) . ';');
	}
Lock one or more tables

@param array $arrTables An array of table names to be locked