MySQL 错误处理例子[译]
2022-11-12 09:17:31
内容摘要
这篇文章主要为大家详细介绍了MySQL 错误处理例子[译]，具有一定的参考价值，可以用来参考一下。
对此感兴趣的朋友，看看idc笔记做的技术笔记！from http://www.devshed.com/c/a/M
文章正文
这篇文章主要为大家详细介绍了MySQL 错误处理例子[译]，具有一定的参考价值，可以用来参考一下。
对此感兴趣的朋友，看看idc笔记做的技术笔记！
from http://www.devshed.com/c/a/MySQL/Error-Handling-Examples/Error Handler ExamplesHere 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 SQLEXCEPTIONSET 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 SQLEXCEPTIONBEGINROLLBACK;SELECT 'Error occurred – 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 2SELECT '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 NOTFOUNDSET 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 1329SET 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 SQLEXCEPTIONSET 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 SQLEXCEPTIONBEGINROLLBACK;SELECT 'Error occurred – 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 2SELECT '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 NOTFOUNDSET 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 1329SET l_done=1;注：关于MySQL 错误处理例子[译]的内容就先介绍到这里，更多相关文章的可以留意
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作者：喵哥笔记
