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HomeDatabaseMysql TutorialMySQL生产库Insert了2次同样的记录但是主键ID是不一样的问题的分_MySQL

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MySQL生产库Insert了2次同样的记录但是主键ID是不一样的问题的分析过程

 

laopan:

 

insert into HudsonResult(JobID,EnvironmentID,FirstSessionID,RerunSessionID,State,Desp,OtherInfo) values ((select ID from Hudson where Stream='A7510_R52_Integration' and State='N' and pakName='needCompile' and User='jinhaiz'),0,'N','N','N','smoke_test','')

 

如果相同的记录不存在就执行上面这条insert命令,防止执行是insert两次。

这个语句该怎么写?

 

能明白不?

现在有个问题就是insert了2次同样的记录但是主键ID是不一样的。

 

me :

如果是mysql数据库的话:

 

1 如果你表中有唯一健的话,可以通过这个唯一健来进行赛选的。

2 如果没有唯一健的话,你需要有判断数据是否重复的条件,根据这个条件先select出来,看是否存在,如果不存在就insert,如果存在要么覆盖要么就忽略掉不执行,这个过程需要多条sql语句,最好开启事务来进行控制。

 

 

Mysql中有一个replace以及Insert into ..... on duplicate key update 来判断对重复数据进行insert或者update的,但是这是依据主健或者唯一健来判断的。你可以参考下下面这篇文章。

 

laopan:

1.唯一键怎么筛选?现在的问题是唯一的不同是key不一样,别的列都是一样的。

 

 

me :

把表结构发给我,我看看 , 通过执行 命令  show create table HudsonResult;  可以得出表结构。

如果没有唯一健的话,就不能从sql层面去判断数据的唯一性,否则资源消耗太大了。需要从应用角度数据来源角度去验证过滤。

 

laopan:mysql> show create table HudsonResult;+--------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| Table        | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |+--------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| HudsonResult | CREATE TABLE `HudsonResult` (  `JobID` int(32) NOT NULL,  `EnvironmentID` int(32) NOT NULL,  `FirstSessionID` varchar(100) default NULL,  `RerunSessionID` varchar(100) default NULL,  `State` varchar(5) default NULL,  `ID` int(32) NOT NULL auto_increment,  `Desp` varchar(100) default NULL,  `ExecNum` int(32) default NULL,  `FailNum` int(32) default NULL,  `ATCStartTime` datetime default NULL,  `ATCEndTime` datetime default NULL,  `FocNumBefore` int(32) default '0',  `FocNumAfter` int(32) default '0',  `Priority` int(32) default '0',  `FocDesp` varchar(5000) default '',  `OtherInfo` varchar(100) default NULL,  PRIMARY KEY  (`ID`)) ENGINE=MyISAM AUTO_INCREMENT=14910 DEFAULT CHARSET=latin1 | +--------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec)

 

现在的问题背景是这样的,网页上insert后,电脑卡了一下,这个时候还没有返回,又点了一下,变成又insert了一次,导致2条记录

内容是一样的,但是主键是不一样的,java你也做过,有没有啥想法,避免这个?

 

 

ME :

把提交按钮做下处理,很简单的,提交一次后,按纽设置为灰色的,操作者点击不了,只有等待提交处理结果出来继续进行下一步操作。

 

 

laopan:

搞定了,呵呵,简单易用哈,考虑多了,谢啦。

 

总结:可见有很多时候错误数据都是由于应用的bug导致的,清理数据的同时要从根源处理问题,数据层面的sql能不动尽量不要动。
 

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