MyBatis 自定义映射结果ResultMap

Posted 2021-02-16 司徒二条

（1）接口中对应的方法

public Emp getEmpById(Integer id);

（2）Mapper文件

 1 　<resultMap type="com.eu.bean.Emp" id="emp">
 2       <id column="id" property="id"/>
 3       <result column="last_name" property="lastName"/>
 4       <result column="gender" property="geder"/>
 5       <result column="email" property="email"/>
 6   </resultMap>
 7   
 8   
 9   <select id="getEmpById" resultMap="emp">
10       select * from emp where id = #{id}
11   </select>

 （3）测试

 1 　　public SqlSessionFactory getSqlSessionFactory() throws IOException {
 2         String resource = "conf/mybatis-config.xml";
 3         InputStream inputStream = Resources.getResourceAsStream(resource);
 4         return new SqlSessionFactoryBuilder().build(inputStream);
 5     }
 6     
 7     @Test
 8     public void testMapper() throws IOException {
 9         SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
10         //1.获取到sqlsession 不会自动提交数据
11         SqlSession openSession = sqlSessionFactory.openSession();
12         EmpDao mapper = openSession.getMapper(EmpDao.class);
13         
14         Emp emp = mapper.getEmpById(4);
15         System.out.println(emp);
16         
17         //手动提交数据
18         openSession.commit();
19         openSession.close();
20     }