Mybatis-Dao层实现（通过代理方式）

1.代理方式开发是主流

2.Mapper接口开发方法只需要编写Mapper接口（相当于Dao接口）,然后由Mybatis根据接口创建动态代理对象

Mapper接口开发需要遵循以下规范

一一对应

UserMapper.xml

<!-- 根据id查询-->
<select id="findById" parameterType="int" resultType="user">
select * from user where id=#{id}
</select>

UserMapper接口(dao层)

public User findById(int Id);

ServiceTest类

public class ServiceTest {
public static void main(String[] args) throws IOException {
InputStream stream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(stream);
SqlSession sqlSession = factory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User user = mapper.findById(1);
System.out.println(user);
}
}

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