在新增的时候报了这个异常
java.sql.SQLException: Field ‘id’ doesn’t have a default value
其实这个很简单 就是 你的Mysql数据库没有设置自动递增：刚才那就话不就是字段“id”没有默认值
在数据库加上自动递增 别忘了主键也加上 就解决了 
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