mybatis基于注解的关联查询

public class User implements UserDetails, Serializable {
//parent是一个对象，有自己的表，这是1对1的多表关联查询
private Parent scale;
//Authority是一个对象，有自己的表，这是1对多的查询
private List<Authority> authoritys;

public interface UserInfoDAO {
//一个user对应一个userinfo
@Select("select * from test_userinfo where id =#{id}")
public UserInfo getUserInfoById(@Param("id") String id);

//select ="com.zwk.dao.UserInfoDAO.getUserInfoById",getUserinfoById方法必须存在
@Select("select * from test_user u where u.id = #{id}")
@Results({
@Result(id = true,property = "id" ,column = "id"),
@Result(property ="password",column = "password"),
@Result(property ="userInfo",column="info_id",one =@One(select ="com.zwk.dao.UserInfoDAO.getUserInfoById"))}
)
public User getById(@Param("id") String id);
}