private function getLockString($lockMode)
{
$lockModeString = TableLockMode::toString($lockMode);
if (!$lockModeString) {
throw new LockException("Invalid lock mode: {$lockMode}");
}
$tableName = $this->getTableName();
$aliases = $this->getTableAliasGuesstimates($tableName);
return $this->constructLockString($tableName, $aliases, $lockModeString);
}