建立实体类和数据库映射（注解）

1.建立实体类和数据库映射
		@Select("select * from user")
    @Results(id = "resultMap",value = {
            @Result(id = true,property = "userId",column ="id"),
            @Result(property = "userName",column ="username"),
            @Result(property = "userSex",column ="sex"),
            @Result(property = "userAddress",column ="address"),
    })
    List findAll();
    
2.其他mapper对其进行引用
		@Select("select * from user where id=#{id}")
    @ResultMap(value={"resultMap"})
    User getUserById(Integer id);