如何在 MySql 过程中抛出错误？
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How to throw an error in MySql procedure?
提问by Arman
What is the mechanism to force the MySQL to throw an error within the stored procedure?
强制 MySQL 在存储过程中抛出错误的机制是什么？
I have a procedure which call s another function:
我有一个调用另一个函数的过程：
PREPARE my_cmd FROM @jobcommand;
EXECUTE my_cmd;
DEALLOCATE PREPARE my_cmd;
the job command is:
作业命令是：
jobq.exec("Select 1;wfdlk# to simulatte an error");
then:
然后：
CREATE PROCEDURE jobq.`exec`(jobID VARCHAR(128),cmd TEXT)
BEGIN
DECLARE result INT DEFAULT 0;
SELECT sys_exec( CONCAT('echo ',cmd,' | base64 -d > ', '/tmp/jobq.',jobID,'.sh ; bash /tmp/jobq.',jobID,'.sh &> /tmp/jobq.',jobID)) INTO result;
IF result>0 THEN
# call raise_mysql_error(result);
END IF;
END;
My jobq.execis always succeeding.
Are there way to rise an error?
How to implement raise_mysql_error function??
我的工作q。exec总是成功。有没有办法提高错误？如何实现 raise_mysql_error 函数？？
BTW I am using MySQL 5.5.8
顺便说一句，我正在使用 MySQL 5.5.8
thanks Arman.
谢谢阿尔曼。
回答by BlitZ
You may use following stored procedure to emulate error-throwing:
您可以使用以下存储过程来模拟错误抛出：
CREATE PROCEDURE `raise`(`errno` BIGINT UNSIGNED, `message` VARCHAR(256))
BEGIN
SIGNAL SQLSTATE
'ERR0R'
SET
MESSAGE_TEXT = `message`,
MYSQL_ERRNO = `errno`;
END
Example:
例子：
CALL `raise`(1356, 'My Error Message');
