其他代碼訪問：Mybatis注解開發(fā)基礎(chǔ)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",//要封裝的屬性名稱column = "uid", //根據(jù)哪個字段進(jìn)行查詢User表的字段javaType = User.class,//要封裝的實體類型//select屬性，代表查詢查詢哪個接口方法獲得數(shù)據(jù)one = @One(select ="com.hao.mapper.UserMapper.findById"))})public List<Order> findAll();}

2.測試

public class MapperTest2 {private OrderMapper orderMapper;@Beforepublic 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);}@Testpublic void testFindAll(){List<Order> list = orderMapper.findAll();for (Order order : list) {System.out.println(order);}} }

測試結(jié)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}}

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