Home  >  Article  >  Database  >  MySql中捕获异常的方法

MySql中捕获异常的方法

WBOY
WBOYOriginal
2016-06-07 14:54:431423browse

mySql中是否能有SQLserver的@@error变量呢,或者如c#中的try catch语法呢。 MySQL 捕获异常 /**mySql中是否能有SQLserver的@@error变量呢,或者如c#中的try catch语法呢。答案是肯定的,实例代码如下:**/CodeDROP PROCEDURE IF EXISTS sp_call_jobs;CREATE

mySql中是否能有SQLserver的@@error变量呢,或者如c#中的try catch语法呢。 MySQL 捕获异常
/**mySql中是否能有SQLserver的@@error变量呢,或者如c#中的try catch语法呢。
答案是肯定的,实例代码如下:**/
Code
DROP PROCEDURE IF EXISTS sp_call_jobs;
CREATE PROCEDURE sp_call_jobs()
    NOT DETERMINISTIC
    SQL SECURITY DEFINER
    COMMENT ''
BEGIN
declare _row,_err,_count int default 0;
DECLARE CONTINUE  HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND set _err=1;
while _row<3 DO
  START TRANSACTION;
     insert into t1(cond_val)values(null);
  COMMIT;
 if _err=1 then
   set _count=_count+1;
 end if;
 set _row=_row+1;
end while;
select _count;
END;
 
/**语句:
DECLARE CONTINUE  HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND set _err=1;
作用是当遇到SQLEXCEPTION,SQLWARNING,NOT FOUND 错误时,设置_err=1并执行CONTINUE操作,即继续执行后面的语句。
这就与c#中的try catch语法很像。
而且在执行可能出错的语句的时候我们用事务语句:START TRANSACTION; …… COMMIT; 可以保证完整性。
**/
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn