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.
3、看看你的数据库定义的时候是不是把主键生成方式设置为int的,但是没有设置为自增的!!或者数据定义的时候设置一个默认值就可以了。