Mysql学习MySQL 错误处理例子[译]

发布时间：2020-12-12 02:33:42 所属栏目：MySql教程来源：网络整理

导读：《Mysql学习MySQL 错误处理例子[译]》要点：本文介绍了Mysql学习MySQL 错误处理例子[译]，希望对您有用。如果有疑问，可以联系我们。 from http://www.devshed.com/c/a/MySQL/Error-Handling-Examples/ Error Handler Examples Here are some examples of h

《Mysql学习MySQL 错误处理例子[译]》要点：
本文介绍了Mysql学习MySQL 错误处理例子[译]，希望对您有用。如果有疑问，可以联系我们。

from http://www.devshed.com/c/a/MySQL/Error-Handling-Examples/
Error Handler Examples
Here are some examples of handler declarations:
If any error condition arises (other than a NOT FOUND ),continue execution after setting l_error=1 :
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
SET l_error=1;
If any error condition arises (other than a NOT FOUND ),exit the current block or stored program after issuing a ROLLBACK statement and issuing an error message:
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
ROLLBACK;
SELECT 'Error occurred C terminating';
END;
If MySQL error 1062 (duplicate key value) is encountered,continue execution after executing the SELECT statement (which generates a message for the calling program):
DECLARE CONTINUE HANDER FOR 106 2
SELECT 'Duplicate key in index';
If SQLSTATE 23000 (duplicate key value) is encountered,continue execution after executing the SELECT statement (which generates a message for the calling program):
DECLARE CONTINUE HANDER FOR SQLSTATE '23000'
SELECT 'Duplicate key in index';
When a cursor fetch or SQL retrieves no values,continue execution after setting l_done=1 :
DECLARE CONTINUE HANDLER FOR NOT
FOUND
SET l_done=1;
Same as the previous example,except specified using a SQLSTATE variable rather than a named condition:
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000 '
SET l_done=1;
Same as the previous two examples,except specified using a MySQL error code variable rather than a named condition or SQLSTATE variable:
DECLARE CONTINUE HANDLER FOR 1329
SET l_done=1;

错误处理例子
有几种错误处理的声明形式：
§ 如果任何错误(不是 NOT FOUND ),设置 l_error 为 1 后继续执行：
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
SET l_error=1;
§ 如果发生任何错误(不是 NOT FOUND),执行 ROLLBACK和产生一条错误消息后退出当前块或存储过程.
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
ROLLBACK;
SELECT 'Error occurred C terminating';
END;
§ 如果 MySQL 1062错误 (重复的健值 )发生,执行 SELECT语句(向调用程序发一条消息)后继续执行
DECLARE CONTINUE HANDER FOR 106 2
SELECT 'Duplicate key in index';
§ 如果 SQLSTATE 2300错误 (重复的健值 )发生,执行 SELECT语句(向调用程序发一条消息)后继续执行
DECLARE CONTINUE HANDER FOR SQLSTATE '23000'
SELECT 'Duplicate key in index';
§ 当游标或者 SQL 选择语句没有返回值时,设置 l_done=1 后继续执行
DECLARE CONTINUE HANDLER FOR NOT
FOUND
SET l_done=1;
§ 此例除了用 SQLSTATE 变量而不是命名条件以外,跟前一个例子一样
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000 '
SET l_done=1;
§ 此例除了用 MySQL 的错误码变量而不是命名条件或者 SQLSTATE 变量以外,跟前两个例子一样
DECLARE CONTINUE HANDLER FOR 1329
SET l_done=1;

《Mysql学习MySQL 错误处理例子[译]》是否对您有启发，欢迎查看更多与《Mysql学习MySQL 错误处理例子[译]》相关教程，学精学透。编程之家PHP学院为您提供精彩教程。

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!