MyBatis——mapper动态代理开发

动态代理操作数据库 只需要:1个接口  1个mapper.xml即可  避免自己手写实现类  简化了操作

创建测试程序1: 根据学号查找学生

测试代码:

public class MapperTest {

	@Test
	public void Test3() throws IOException {
	String resource = "sqlMapConfig.xml";  //路径
		
		//读取配置文件(用输入流来读取)
		InputStream in = Resources.getResourceAsStream(resource );
		
		//创建sqlSessionFactory
		SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(in);
		
		//生产一个sqlSession
		SqlSession ss = ssf.openSession();
		
		//操作数据库
		StudentMapper mapper = ss.getMapper(StudentMapper.class);
		
		//通过mapper能直接获取接口对象
		Student student = mapper.selectStuByNum("2016001");
		System.out.println(student);
	}
}

接口:

public interface StudentMapper {
    //通过学号查询学生
	public Student selectStuByNum(String num);
}

StudentMapper.xml:

运行结果:

猜你喜欢

转载自blog.csdn.net/weixin_42153410/article/details/92577325