MyBatis+MySQL 返回插入的主键ID

useGeneratedKeys="true" keyProperty="userId"  这两句话加进去要传的值   userId 是要返回的id

<insert id="insertAndGetId" useGeneratedKeys="true" keyProperty="userId" parameterType="com.chenzhou.mybatis.User">
insert into user(userName,password,comment)
values(#{userName},#{password},#{comment})
</insert>

User user = new User();
user.setUserName("chenzhou");
user.setPassword("xxxx");
user.setComment("测试插入数据返回主键功能");

System.out.println("插入前主键为："+user.getUserId());
userDao.insertAndGetId(user);//插入操作
System.out.println("插入后主键为："+user.getUserId());