MySQL 如何更改MySQL存储过程？

如果我们拥有存储过程的ALTER ROUTINE权限，则可以使用 ALTER PROCEDURE 语句更改MySQL存储过程。为了演示它，我们将使用名为“delete_studentinfo”的存储过程的示例，该存储过程具有以下创建语句 –

mysql> SHOW CREATE PROCEDURE Delete_studentinfo\G
*************************** 1. row ***************************
           Procedure: Delete_studentinfo
            sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_
ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `Delete_studentinfo`( IN p_id INT)
BEGIN
DELETE FROM student_info
WHERE ID=p_id;
END
character_set_client: cp850
collation_connection: cp850_general_ci
  Database Collation: latin1_swedish_ci
1 row in set (0.01 sec)

在上面的结果集中，可以清楚地看出存储过程“delete_studentinfo”中没有注释。现在，使用ALTER PROCEDURE语句，我们可以添加注释如下 –

mysql> ALTER PROCEDURE Delete_studentinfo
   -> COMMENT 'deleting the record'//
Query OK, 0 rows affected (0.03 sec)

现在，可以确认已经在存储过程中添加了注释，可以通过以下查询的结果集进行确认 –

mysql> SHOW CREATE PROCEDURE Delete_studentinfo\G
*************************** 1. row ***************************
           Procedure: Delete_studentinfo
            sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_
ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
    Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `Delete_studen
tinfo`( IN p_id INT)
   COMMENT 'deleting the record'
BEGIN
DELETE FROM student_info
WHERE ID=p_id;
END
character_set_client: cp850
collation_connection: cp850_general_ci
  Database Collation: latin1_swedish_ci
1 row in set (0.00 sec)

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