в 13:46, 26 мая 2010

2010-05-26T13:46:00Z

Admin: 1 версия

2010-05-26T10:17:12Z

1 версия

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==Get lock in a procedure==



<source lang="sql">

mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
-> BEGIN
-> DECLARE lock_result INT;
-> IF get_lock("sp_critical_section_lock",60) THEN
-> /* This block can only be run by one user at a time*/
-> SELECT "got lock";
-> /* Critical code here */
-> SET lock_result=release_lock("sp_critical_section_lock");
-> ELSE
-> SELECT "failed to acquire lock";
-> /* Error handling here */
-> END IF;
-> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql> call myProc();
+----------+
| got lock |
+----------+
| got lock |
+----------+
1 row in set (0.02 sec)
Query OK, 0 rows affected (0.02 sec)
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
</source>

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SQL/MySQL/Procedure Function/Lock - История изменений

в 13:46, 26 мая 2010

Admin: 1 версия