Mybatis mapper接口动态代理开发步骤解析
一、必须遵守的四项原则
1:接口 方法名==xx.xml中的id名
2:方法返回值类型与Mapper.xml文件中返回值类型一致
3:方法的入参类型与Mapper.xml文件中入参值类型一致
4:命名空间绑定接口
二、代码
public class UserMapperTest {
private SqlSession sqlSession;
private InputStream in;
@Before
public void before() throws IOException {
//1.读取配置文件
in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.创建 SqlSessionFactory 的构建者对象
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
//3.使用构建者创建工厂对象 SqlSessionFactory
SqlSessionFactory sqlSessionFactory = builder.build(in);
sqlSession = sqlSessionFactory.openSession();
}
@After
public void after() throws IOException {
//7.释放资源
sqlSession.close();
in.close();
}
@Test
public void findUserById() {
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
List<User> users = userMapper.findAll();
for (User user : users) {
System.out.println(user);
}
}
}
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