MySQL存储过程的异常处理方法

本文实例讲述了MySQL存储过程的异常处理方法。分享给大家供大家参考。具体如下： mysqlmysql delimiter $$mysqlmysql CREATE PROCEDURE myProc - (p_first_name VARCHAR(30), - p_last_name VARCHAR(30), - p_city VARCHA

                        <p>本文实例讲述了MySQL存储过程的异常处理方法。分享给大家供大家参考。具体如下：</p>

mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc -> (p_first_name VARCHAR(30), -> p_last_name VARCHAR(30), -> p_city VARCHAR(30), -> p_description VARCHAR(30), -> OUT p_sqlcode INT, -> OUT p_status_message VARCHAR(100)) -> BEGIN -> -> / START Declare Conditions / -> -> DECLARE duplicate_key CONDITION FOR 1062; -> DECLARE foreign_key_violated CONDITION FOR 1216; -> -> / END Declare Conditions / -> -> / START Declare variables and cursors / -> -> DECLARE l_manager_id INT; -> -> DECLARE csr_mgr_id CURSOR FOR -> SELECT id -> FROM employee -> WHERE first_name=p_first_name -> AND last_name=p_last_name; -> -> / END Declare variables and cursors / -> -> / START Declare Exception Handlers / -> -> DECLARE CONTINUE HANDLER FOR duplicate_key -> BEGIN -> SET p_sqlcode=1052; -> SET p_status_message='Duplicate key error'; -> END; -> -> DECLARE CONTINUE HANDLER FOR foreign_key_violated -> BEGIN -> SET p_sqlcode=1216; -> SET p_status_message='Foreign key violated'; -> END; -> -> DECLARE CONTINUE HANDLER FOR not FOUND -> BEGIN -> SET p_sqlcode=1329; -> SET p_status_message='No record found'; -> END; -> -> / END Declare Exception Handlers / -> -> / START Execution / -> -> SET p_sqlcode=0; -> OPEN csr_mgr_id; -> FETCH csr_mgr_id INTO l_manager_id; -> -> IF p_sqlcode<>0 THEN / Failed to get manager id/ -> SET p_status_message=CONCAT(p_status_message,' when fetching manager id'); -> ELSE -> INSERT INTO employee (first_name,id,city) -> VALUES(p_first_name,l_manager_id,p_city); -> -> IF p_sqlcode<>0 THEN / Failed to insert new department / -> SET p_status_message=CONCAT(p_status_message, -> ' when inserting new department'); -> END IF; -> END IF; -> -> CLOSE csr_mgr_id; -> -> / END Execution / -> -> END$$ 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)

希望本文所述对大家的MySQL数据库程序设计有所帮助。