Mybatis中注解的一种简单使用方法

1. 注解在UserMapper接口上实现,不用写Mapper.xml了

   @Select(value = "select * from user")
   List<User> getUsers();
   

2. 需要在核心配置文件中绑定接口！

   <!--绑定接口-->
   <mappers>
       <mapper class="com.tt.dao.UserMapper"/>
   </mappers>
   

3. 测试

	public class UserMapperTest {
	    @Test
	    public void test(){
	        SqlSession sqlSession = MyBatisUtils.getSqlSession();
	        //底层主要应用反射
	        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
	        List<User> users = mapper.getUsers();
	        for (User user : users) {
	            System.out.println(user);
	        }
	        sqlSession.close();
	    }
	}

注解的本质是反射机制