我创建了一个 MySQL 函数,如果为参数传递的值无效,我想引发错误.在 MySQL 函数中引发错误的选项有哪些?
I've created a MySQL function and would like to raise an error if the values passed for the parameters are invalid. What are my options for raising an error within a MySQL function?
MySQL 5.5 引入了信号,类似于其他语言中的异常:
MySQL 5.5 introduces signals, which are similar to exceptions in other languages:
http://dev.mysql.com/doc/refman/5.5/en/signal.html
例如在mysql
命令行客户端:
mysql> SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Custom error';
ERROR 1644 (45000): Custom error
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