MySQL 存储过程的异常处理
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2024-01-25 21:41:29
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无详细内容 异常处理 MySQL mysqlmysql delimiter $$mysqlmysql CREATE PROCEDURE myProc - (p_first_name VARCHAR(30), - p_last_name VARCHAR(30), - p_city VARCHAR(30), - p_description VARCHAR(30), - OUT p_sqlcode INT, - OUT p_status_message VARCH
异常处理 MySQLmysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc -> (p_first_name VARCHAR(30), -> p_last_name VARCHAR(30), -> p_city VARCHAR(30), -> p_description VARCHAR(30), -> OUT p_sqlcode INT, -> OUT p_status_message VARCHAR(100)) -> BEGIN -> -> /* START Declare Conditions */ -> -> DECLARE duplicate_key CONDITION FOR 1062; -> DECLARE foreign_key_violated CONDITION FOR 1216; -> -> /* END Declare Conditions */ -> -> /* START Declare variables and cursors */ -> -> DECLARE l_manager_id INT; -> -> DECLARE csr_mgr_id CURSOR FOR -> SELECT id -> FROM employee -> WHERE first_name=p_first_name -> AND last_name=p_last_name; -> -> /* END Declare variables and cursors */ -> -> /* START Declare Exception Handlers */ -> -> DECLARE CONTINUE HANDLER FOR duplicate_key -> BEGIN -> SET p_sqlcode=1052; -> SET p_status_message='Duplicate key error'; -> END; -> -> DECLARE CONTINUE HANDLER FOR foreign_key_violated -> BEGIN -> SET p_sqlcode=1216; -> SET p_status_message='Foreign key violated'; -> END; -> -> DECLARE CONTINUE HANDLER FOR not FOUND -> BEGIN -> SET p_sqlcode=1329; -> SET p_status_message='No record found'; -> END; -> -> /* END Declare Exception Handlers */ -> -> /* START Execution */ -> -> SET p_sqlcode=0; -> OPEN csr_mgr_id; -> FETCH csr_mgr_id INTO l_manager_id; -> -> IF p_sqlcode0 THEN /* Failed to get manager id*/ -> SET p_status_message=CONCAT(p_status_message,' when fetching manager id'); -> ELSE -> INSERT INTO employee (first_name,id,city) -> VALUES(p_first_name,l_manager_id,p_city); -> -> IF p_sqlcode0 THEN /* Failed to insert new department */ -> SET p_status_message=CONCAT(p_status_message, -> ' when inserting new department'); -> END IF; -> END IF; -> -> CLOSE csr_mgr_id; -> -> /* END Execution */ -> -> END$$ Query OK, 0 rows affected (0.02 sec) mysql> mysql> delimiter ; mysql> set @myCode = 0; Query OK, 0 rows affected (0.00 sec) mysql> set @myMessage = 0; Query OK, 0 rows affected (0.00 sec) mysql> mysql> call myProc('Jason','Martin','New City','New Description',@myCode,@myMessage); Query OK, 1 row affected (0.00 sec) mysql> mysql> select @myCode, @myMessage; +---------+------------+ | @myCode | @myMessage | +---------+------------+ | 0 | NULL | +---------+------------+ 1 row in set (0.00 sec) mysql> mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec)
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