Field 'id' doesn't have a default value问题解决方法
2017-04-27 17:43
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Field 'id' doesn't have a default value问题解决方法
突然想温习温习对数据库的读写。于是就用mysql建了一张单独的表(见代码1),用Hibernate写了个应用,能够正常查询、改动数据了。開始时。数据是在mysql的GUI工具里手工输入的,嫌烦,于是就想到用程序批量生成一些,于是麻烦也跟着来了……代码1Sql代码CREATE TABLE `stitp`.`Ticket` (`id` int(11) NOT NULL,`state` tinyint(1) NOT NULL,`grade` int(2) NOT NULL,PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=gbk执行插入数据的java代码,报异常:field ‘id' doesn't have a default value没错啊。我的主键怎么可能有默认值呢?不理解。谷歌了一下这个异常。一大坨结果,总结一下就是那么两种方法:解决方法一:打开my.ini。查找sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"改动为sql-mode="NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"然后重新启动MYSQL解决方法二:MySQL 5 uses a strict mode which needs to be disabled.In Windows, Goto Start-->Programs-->MySQL->MySQL Instance Config Wizard. Follow through the Reconfigure Instance option-->Detailed Configuration-->Continue Next a few screens. At the bottom under Enable TCP/IP option there is 'Enable Strict Mode'. Deslect this option (no tick). Save changes and MySQL will restart.都试了。没用,并且我是Fedora,没有ini文件。而是cnf文件(我的my.cnf在/etc以下)这个keyword看来是找不到办法了,换成查找hibernate里对主键的设置吧。果然就找到了办法!原来是.hbm.xml文件的设置问题。在里面把主键的属性改为:Xml代码<generator class="assigned"/>再执行就能够了。由于assigned是指主键是由人工分配的。而native则指主键值由库自己主动给出。我曾经都是想都没想就加上native的,反正也不知道什么意思,并且曾经用到要插入数据的表,主键都是“auto increment”的,所以也没碰到问题。这次就暴露了。总结一下:事实上就是缺乏对Hibernate的全面理解,没有全然掌握它的各种设置。由于当初学hibernate也是抱着"需求"学的,而不是正儿八经学习它的,没有全然理解各种设置就上手了。
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