如何检查MySQL中是否存在存储过程？
让我们首先创建一个存储过程-
mysql> DELIMITER // mysql> CREATE PROCEDURE ExtenddatesWithMonthdemo(IN date1 datetime, IN NumberOfMonth int ) -> BEGIN -> SELECT DATE_ADD(date1,INTERVAL NumberOfMonth MONTH) AS ExtendDate; -> END; -> // mysql> DELIMITER ;
现在，使用helpSHOWCREATE命令检查存储过程是否存在。
查询如下-
mysql> SHOW CREATE PROCEDURE ExtenddatesWithMonthdemo; The following is the output displaying the details of the stored procedure we created above: +--------------------------+--------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ | Procedure | sql_mode | Create Procedure | character_set_client | collation_connection | Database Collation | +--------------------------+--------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ | ExtenddatesWithMonthdemo | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | CREATE DEFINER = `root`@`%` PROCEDURE `ExtenddatesWithMonthdemo`(IN date1 datetime, IN NumberOfMonth int ) BEGIN SELECT DATE_ADD(date1,INTERVAL NumberOfMonth MONTH) AS ExtendDate; END | utf8 | utf8_general_ci | utf8_general_ci | +--------------------------+--------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+ 1 row in set (0.00 sec)
借助CALL命令调用存储过程。查询如下-
mysql> call ExtenddatesWithMonthdemo('2019-02-13',6);输出结果
+---------------------+ | ExtendDate | +---------------------+ | 2019-08-13 00:00:00 | +---------------------+ 1 row in set (0.10 sec)