当前位置:Gxlcms > mysql > MySQL存储过程的异常处理方法

MySQL存储过程的异常处理方法

时间:2021-07-01 10:21:17 帮助过:33人阅读

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:

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。

您可能感兴趣的文章:

  • mysql5.7.21启动异常的修复方法
  • JDBC连接mysql乱码异常问题处理总结
  • 连接MySQL时出现1449与1045异常解决办法
  • mysql innodb 异常修复经验分享
  • mysql中异常错误ERROR:2002的解决方法
  • MySQL定义异常和异常处理详解
  • linux 后台日志 mysql 错误异常的解释(推荐)
  • mysql存储过程中的异常处理解析
  • MySQL存储过程中一些基本的异常处理教程
  • navicatdesignquery.sql.bak系统找不到指定路径错误的解决方法

人气教程排行