Spring_22_整合Mybatis方式二

整合Mybatis方式二 SqlSessionDaoSupport

• 让实现类继承 org.mybatis.spring.support.SqlSessionDaoSupport;

  public class UserMapperImplTwo extends SqlSessionDaoSupport implements UserMapper

• 继承之后可以通过父类的getSqlSession()方法获取到SqlSession对象， 就不需要在application.xml文件中再进行SqlSession的配置了，但是需要给实现类传入一个SqlSessionFactory对象

   <!--注入实现类 传入sqlSessionFactory-->
   <bean name="queryUser2" class="com.shi.mapper.UserMapperImplTwo">
       <property name="sqlSessionFactory"  ref="sqlSessionFactory"/>
   </bean>
  

• 代码

  • 实现类

    public class UserMapperImplTwo extends SqlSessionDaoSupport implements UserMapper {

                 public List<User> queryUser() {
    
                       /*
                       //获取SqlSession
                       SqlSessionTemplate sqlSession=getSqlSessionTemplate();
    
                       //注册映射文件
                       UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
    
                       //返回执行结果
                       return userMapper.queryUser();
                      */
    
                       //总结一行代码
                       return getSqlSession().getMapper(UserMapper.class).queryUser();
                   }
               }   
    

  • 测试类

    @Test
    public void testQueryUserTwo() throws IOException {
    //注册配置文件
    ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

       //获取对象
       UserMapper userMapper=context.getBean("queryUser2",UserMapper.class);
    
       //执行方法
       List<User> userList=userMapper.queryUser();
    
       //输出
       for (User user:userList) {
           System.out.println(user);
       }
    

    }