解释这段代码@Autowired private ChartDataService chartDataService; //TempTop @RequestMapping("TempTop") public Result getTempretureTop() { String name = "TempTop"; GetData getData = new GetData(); QueryWrapper wrapper = new QueryWrapper(); wrapper.eq("name", name); int count = chartDataService.count(wrapper); if (count == 0) { ChartData chartData = new ChartData(); String value = getData.getTempretureTop(); chartData.setName(name); chartData.setValue(value); chartDataService.save(chartData); return Result.ok(chartData); } else { ChartData chartData = chartDataService.getOne(wrapper); return Result.ok(chartData); } }
时间: 2023-06-03 19:05:07 浏览: 92
这段代码是一个后端接口,使用@RequestMapping注解指定了请求路径为"TempTop"。接口的作用是获取温度排名数据,首先调用chartDataService的count方法获取符合条件的记录数,如果记录数为0,则根据getData获取温度数据,并将数据插入数据库中;如果记录数不为0,则从数据库中获取数据并返回给前端。其中@Autowired注解表示自动注入ChartDataService的实例。
相关问题
我要写一个查看被教师和校长驳回的信息,写一个coonterller专门去查看,代码应该怎么写,给我完整代码@Autowired private RuntimeService runtimeService; @Autowired private TaskService taskService; @Autowired private HistoryService historyService; @Autowired private RepositoryService repositoryService; @PostMapping("leave") public R startLeave(String name,Integer days){ //学生发起请假 Map<String, Object> map=new HashMap<>(); map.put("studentUser",name); map.put("day",days); //通过流程ID启动一个流程实例 ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("StudentLeave", map); //根据流程processInstance实例id创建学生的任务,singleResult单个任务 Task studentTask = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult(); //让学生完成任务 taskService.complete(studentTask.getId()); return R.ok("发起请假成功"); }}
您想要编写一个Controller用于查看被教师和校长驳回的信息。以下是一个示例代码,供您参考:
```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/rejected")
public class RejectedInfoController {
@Autowired
private TaskService taskService;
@Autowired
private HistoryService historyService;
@GetMapping
public R getRejectedInfo() {
// 查询被教师和校长驳回的任务历史记录
List<HistoricTaskInstance> rejectedTasks = historyService
.createHistoricTaskInstanceQuery()
.taskDeleteReason("rejected")
.list();
// 处理查询结果
List<Map<String, Object>> rejectedInfoList = new ArrayList<>();
for (HistoricTaskInstance task : rejectedTasks) {
Map<String, Object> rejectedInfo = new HashMap<>();
rejectedInfo.put("taskId", task.getId());
rejectedInfo.put("taskName", task.getName());
rejectedInfo.put("assignee", task.getAssignee());
rejectedInfo.put("processInstanceId", task.getProcessInstanceId());
// 可以根据需要添加更多相关信息
rejectedInfoList.add(rejectedInfo);
}
return R.ok().put("rejectedInfo", rejectedInfoList);
}
}
```
请注意,这只是一个示例代码,您可能需要根据您的具体需求进行适当的修改和调整。还请确保已正确注入相关的服务(如TaskService、HistoryService等)。
@Data @AllArgsConstructor @NoArgsConstructor @Builder @Table(name = "advert") public class Advert { /** * 主键 / @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @ApiModelProperty(value = "广告唯一id") private Integer id; /* * 广告名称 / @ApiModelProperty(value = "广告名称") @NotBlank(message = "广告名称不可为空", groups = {AddGroup.class, UpdateGroup.class}) private String name; /* * 广告位置ID / @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "position_id") private AdPosition position; /* * 广告图片ID / @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "media_id") private MediaFile media; /* * 开始日期 / @Column(name = "start_date") @ApiModelProperty(value = "开始日期") @NotNull(message = "开始日期不可为空", groups = {AddGroup.class}) private Date startDate; /* * 结束日期 / @Column(name = "end_date") @ApiModelProperty(value = "结束日期") @NotNull(message = "结束日期不可为空", groups = {AddGroup.class}) private Date endDate; /* * 广告链接 / @ApiModelProperty(value = "广告链接") @NotBlank(message = "广告链接不可为空", groups = {AddGroup.class}) private String link; /* * 广告状态:0:未启用,1:已启用,2:已结束 / @ApiModelProperty(value = "广告状态") @NotNull(message = "广告状态不可为空", groups = {UpdateGroup.class}) private Integer status; /* * 创建时间 / @Column(name = "create_time") @ApiModelProperty(value = "创建时间") private Date createTime; /* * 更新时间 */ @Column(name = "update_time") @ApiModelProperty(value = "更新时间") private Date updateTime; },对这个类的对象进行添加和修改时,因为在server层有大量重复代码,如何简化代码并避免并发问题
可以使用Spring Data JPA中的`CrudRepository`或`JpaRepository`接口来简化代码,并避免并发问题。
首先,定义一个通用的BaseService类,其中包含常用的CRUD操作:
```
public abstract class BaseService<T, ID extends Serializable> {
@Autowired
protected JpaRepository<T, ID> repository;
public T save(T entity) {
return repository.save(entity);
}
public T findById(ID id) {
return repository.findById(id).orElse(null);
}
public void delete(T entity) {
repository.delete(entity);
}
public void deleteById(ID id) {
repository.deleteById(id);
}
public List<T> findAll() {
return repository.findAll();
}
public Page<T> findAll(Pageable pageable) {
return repository.findAll(pageable);
}
}
```
然后,定义一个AdvertService类,继承BaseService,并添加一些特定的业务方法:
```
@Service
public class AdvertService extends BaseService<Advert, Integer> {
@Autowired
private AdvertRepository advertRepository;
public List<Advert> findByStatus(Integer status) {
return advertRepository.findByStatus(status);
}
public List<Advert> findByPositionId(Integer positionId) {
return advertRepository.findByPositionId(positionId);
}
// add other business methods here
}
```
在AdvertRepository接口中定义需要的查询方法:
```
public interface AdvertRepository extends JpaRepository<Advert, Integer> {
List<Advert> findByStatus(Integer status);
List<Advert> findByPositionId(Integer positionId);
// add other query methods here
}
```
最后,在controller层中使用AdvertService来进行增删改查操作:
```
@RestController
@RequestMapping("/advert")
public class AdvertController {
@Autowired
private AdvertService advertService;
@PostMapping("/add")
public Result add(@RequestBody Advert advert) {
advertService.save(advert);
return Result.success();
}
@PostMapping("/update")
public Result update(@RequestBody Advert advert) {
advertService.save(advert);
return Result.success();
}
// add other controller methods here
}
```
这样做可以避免重复的代码,同时也可以有效地避免并发问题。由于Spring Data JPA会自动处理事务,因此在进行增删改操作时,可以确保数据的一致性。