家庭记账本4

完成User后端增删改查的操作

实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User extends Model<User> {
@TableId(type = IdType.AUTO)
private Integer username;

private String password;

private String role;


}

像前端传递消息的实体类

@NoArgsConstructor
@AllArgsConstructor
@Data
public class Result {
    private Integer code;//响应码，1 代表成功; 0 代表失败
    private String msg;  //响应信息 描述字符串
    private Object data; //返回的数据

    //增删改 成功响应
    public static Result success(){
        return new Result(1,"success",null);
    }
    //查询 成功响应
    public static Result success(Object data){
        return new Result(1,"success",data);
    }
    //失败响应
    public static Result error(String msg){
        return new Result(0,msg,null);
    }
}

UserController.java

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    UserService service;
    @GetMapping("{username}")
    public  Result findById(@PathVariable int username){
        return Result.success(service.getById(username));
    }

    @PostMapping
    public Result add(@RequestBody User user){
        service.save(user);
        return Result.success();
    }
    @DeleteMapping("{username}")
    public Result delById(@PathVariable int username){
        service.removeById(username);
        return Result.success();
    }
    @PutMapping
    public Result update(@RequestBody User user){
        service.updateById(user);
        return Result.success();
    }

}

UserService.java

public interface UserService extends IService<User> {

}

UserServiceImpl.java

@Service
public class UserServiceImpl extends ServiceImpl<UserDao, User> implements UserService {

}

UserDao.java

@Mapper
public interface UserDao extends BaseMapper<User> {

}

后端就此完成

项目结构如下