java接口概念(java什么是接口)

CRUD

单条查询：

@RequestMapping(value = "/qust",method = RequestMethod.GET)
public Student list(@PathVariable Integer id){
   List ldd  =   orderRecordMapper.selectByPrimaryKey(id);
   return ldd ;
}

或
@RequestMapping(value = "/qust",method = RequestMethod.GET)
public @RequestBodylist  Object qust (Integer id){
   Student ldd  =   orderRecordMapper.selectByPrimaryKey(id);
   return ldd ;
}
全表查询：
xml配置文件增加全表查询


 SELECT 
 FROM order_record


新增查询全表数据接口方法
List selectAll();


@RequestMapping(value = "/list",method = RequestMethod.GET)
public List list(){
    List ldd  =   orderRecordMapper.selectAll();
    return ldd ;
}

新增表数据

//@Transactional(rollbackFor = Exception.class)  开启事务 一般不需要开启
public void insert(OrderRecordInsertUpdateDto dto) throws Exception{
   

   //TODO：采用spring提供的BeanUtils进行操作 只需三行代码
   OrderRecord record=new OrderRecord();
   BeanUtils.copyProperties(dto,record);
   orderRecordMapper.insertSelective(record);
}

@Autowired
private OrderRecordMapper orderRecordMapper;
@Autowired
private OrderRecordService orderRecordService;
@RequestMapping(value = prefix+"/save",method = RequestMethod.POST,consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public baseResponse insert(@RequestBody OrderRecordInsertUpdateDto dto){
    baseResponse response=new baseResponse(StatusCode.Success);
    try {
        log.info("接收数据：{} ",dto);

        //TODO：进行属于你自己的控制层层面的校验以及处理
        orderRecordService.insert(dto);
    }catch (Exception e){
        log.error("新增发生异常：",e.fillInStackTrace());
        response=new baseResponse(StatusCode.Fail.getCode(),e.getMessage());
    }
    return response;
}

更新表数据

public void update(OrderRecord entity,OrderRecordInsertUpdateDto dto) throws Exception{
    //TODO：采用spring提供的BeanUtils进行操作 
    final Integer pk=entity.getId();
    BeanUtils.copyProperties(dto,entity);
    entity.setUpdateTime(new Date());
    entity.setId(pk);

    orderRecordMapper.updateByPrimaryKeySelective(entity);
}

@RequestMapping(value = prefix+"/update",method = RequestMethod.POST,consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public baseResponse update(@RequestBody OrderRecordInsertUpdateDto dto){
  baseResponse response=new baseResponse(StatusCode.Success);
  try {
      log.info("接收数据：{} ",dto);

      //TODO：进行属于你自己的控制层层面的校验以及处理
      OrderRecord entity=orderRecordMapper.selectByPrimaryKey(dto.getId());
      if (entity==null){
          return new baseResponse(StatusCode.Entity_Not_Exist);
      }

      orderRecordService.update(entity,dto);
  }catch (Exception e){
      log.error("更新发生异常：",e.fillInStackTrace());
      response=new baseResponse(StatusCode.Fail.getCode(),e.getMessage());
  }
  return response;
}