ree to use (that is, not locked).\nReturns 1 if the lock is free (no one is using the lock), 0 if the lock\nis in use, and NULL if an error occurs (such as an incorrect argument).\n\nURL: https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html\n\n','','https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html');