Mybatis——注解开发常用注解以及完成基本crud

使用SpringBoot集成Mybatis
利用注解开发完成基本的增删改查操作
基本的注解有

User实体类

public class User {
     
    private int id;
    private String name;
    private String password;
    //......注意配置get、set和ToString函数
}

UserMapper

@Mapper
@Repository
public interface UserMapper {
     

    @Select("select * from user")
    public List<User> findAll();

    @Insert("insert into user values(#{id},#{name},#{password})")
    public void save(User user);

    @Update("update user set name=#{name},password=#{password} where id=#{id}")
    public void update(User user);

    @Delete("delete from user where id=#{id}")
    public void delete(int id);

    @Select("select * from user where id=#{id}")
    public User findById(int id);
}

测试

@RunWith(SpringRunner.class)
@SpringBootTest
class SpringBootMybatisApplicationTests {
     

    @Autowired
    private UserMapper userMapper;

    @Test
    public void testFindAllAnno(){
     
        List<User> userList = userMapper.findAll();
        System.out.println(userList);
    }

    @Test
    public void testFindByIdAnno(){
     
        User user = userMapper.findById(1);
        System.out.println(user);
    }

    @Test
    public void testDelectAnno(){
     
        userMapper.delete(1);
    }

    @Test
    public void testSaveAnno(){
     
        User user = new User();
        user.setName("张三");
        user.setId(1);
        user.setPassWord("123456");
        userMapper.save(user);
    }

    @Test
    public void testUpdateAnno(){
     
        User user = new User();
        user.setName("张三");
        user.setId(1);
        user.setPassWord("123");
        userMapper.update(user);
    }
}