Mybatis注解开发(一对一)

其他代码访问：Mybatis注解开发基础操作

1.添加OrderMapper接口

public interface OrderMapper {

//    @Select("select *,o.id oid from orders o,user u where o.uid=u.id")

//    @Results({

//            @Result(column = "oid",property = "id"),

//            @Result(column = "ordertime",property = "ordertime"),

//            @Result(column = "uid",property = "user.id"),

//            @Result(column = "username",property = "user.username"),

//            @Result(column = "password",property = "user.password")

//    })

//    public List<Order> findAll();

    @Select("select * from orders")

    @Results({

            @Result(column = "oid",property = "id"),

            @Result(column = "ordertime",property = "ordertime"),

            @Result(column = "total",property = "total"),

            @Result(

                    property = "user",//要封装的属性名称

                    column = "uid", //根据哪个字段进行查询User表的字段

                    javaType = User.class,//要封装的实体类型

                    //select属性，代表查询查询哪个接口方法获得数据

                    one = @One(select ="com.hao.mapper.UserMapper.findById")

            )

    })

    public List<Order> findAll();

    }

2.测试

public class MapperTest2 {

    private OrderMapper orderMapper;

    @Before

    public void before() throws IOException {

        InputStream stream = Resources.getResourceAsStream("SqlMapConfig.xml");

        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(stream);

        SqlSession sqlSession = build.openSession(true);

        orderMapper = sqlSession.getMapper(OrderMapper.class);

    }

    @Test

    public void testFindAll(){

        List<Order> list = orderMapper.findAll();

        for (Order order : list) {

            System.out.println(order);

        }

    }

}

测试结果：
Order{id=0, ordertime=Wed Dec 12 08:00:00 CST 2018, total=3000.0, user=User{id=1, username=‘lucy’, password=‘123’, birthday=Wed Dec 12 08:00:00 CST 2018}}
Order{id=0, ordertime=Wed Dec 12 08:00:00 CST 2018, total=4000.0, user=User{id=1, username=‘lucy’, password=‘123’, birthday=Wed Dec 12 08:00:00 CST 2018}}
Order{id=0, ordertime=Wed Dec 12 08:00:00 CST 2018, total=5000.0, user=User{id=2, username=‘dou’, password=‘bi’, birthday=null}}

巴特西

Mybatis注解开发(一对一)

其他代码访问：Mybatis注解开发基础操作

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