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MySql中捕获异常的方法

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2016-06-07 14:54:431462browse

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。
**/
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