MySQL 如何检查存储过程是否存在

首先，让我们创建一个存储过程 −

mysql> DELIMITER //
mysql> CREATE PROCEDURE ExtenddatesWithMonthdemo(IN date1 datetime, IN NumberOfMonth int )
   -> BEGIN
   -> SELECT DATE_ADD(date1,INTERVAL NumberOfMonth MONTH) AS ExtendDate;
   -> END;
   -> //
Query OK, 0 rows affected (0.20 sec)
mysql> DELIMITER ;

现在，您可以使用SHOW CREATE命令检查存储过程是否存在。

查询如下所示 −

mysql> SHOW CREATE PROCEDURE ExtenddatesWithMonthdemo;
以下是我们上面创建的存储过程的详细信息：
+--------------------------+--------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+
| 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)

使用CALL命令调用存储过程。查询如下所示 −

mysql> call ExtenddatesWithMonthdemo('2019-02-13',6);

阅读更多：MySQL 教程

输出

+---------------------+
| ExtendDate          |
+---------------------+
| 2019-08-13 00:00:00 |
+---------------------+
1 row in set (0.10 sec)
Query OK, 0 rows affected (0.12 sec)