MyBatis（四）多参数处理问题

这里总结了关于多参数传递时，MyBatis接收的三种方式。

（1）接口中编写方法

 　　public Emp getEmpByParams(Integer id,String lastNmae);

     public Emp getEmpByParam(@Param("id")Integer id,@Param("lastName")String lastNmae);

     public Emp getEmpByParam(Map<String, Object> map);

（2）编写Mapper文件

　　<select id="getEmpByParams" resultType="com.eu.bean.Emp">
        select id,last_name lastName,gender geder,email from Emp where id = #{param1} and last_name= #{param2}
   </select>
　　<select id="getEmpByParam" resultType="com.eu.bean.Emp">
        select id,last_name lastName,gender geder,email from Emp where id = #{id} and last_name= #{lastName}
    </select>

（3）编写测试

 　　public SqlSessionFactory getSqlSessionFactory() throws IOException {
         String resource = "conf/mybatis-config.xml";
         InputStream inputStream = Resources.getResourceAsStream(resource);
         return new SqlSessionFactoryBuilder().build(inputStream);
     }
 　　@Test
     public void testMapperPar() throws IOException {
         SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
         //1.获取到sqlsession 不会自动提交数据
         SqlSession openSession = sqlSessionFactory.openSession();
         EmpDao mapper = openSession.getMapper(EmpDao.class);

         Emp emp = mapper.getEmpByParam(1, "张三");
         System.out.println(emp);

         //手动提交数据
         openSession.commit();
         openSession.close();
     }

     @Test
     public void testMapperMap() throws IOException {
         SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
         //1.获取到sqlsession 不会自动提交数据
         SqlSession openSession = sqlSessionFactory.openSession();
         EmpDao mapper = openSession.getMapper(EmpDao.class);

         Map<String, Object> map=new HashMap<String, Object>();
         map.put("id", 1);
         map.put("lastName", "张三");
         Emp emp = mapper.getEmpByParam(map);
         System.out.println(emp);

         //手动提交数据
         openSession.commit();
         openSession.close();
     }