创建mysql数据表的时候没有设置自增，后面怎么设置成自增？
用命令或phpmydamin
------解决方案--------------------
命令：alter table tt modify id int auto_increment primary key
phpmyadmin也有相关功能。
------解决方案--------------------
进入phpmyadmin看表结构，有一项修改字段的，进去后把auto_increment打钩。
------解决方案--------------------
这年代都用sql工具了：http://download.csdn.net/detail/dmtnewtons/4230136
图形化界面，很好操作
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