不使用Spring JPA更新实体中未指定的字段

Question

我正在使用REST API创建应用程序，因此其中一个端点是创建的，另一个是更新的。当我尝试更新实体时，我遇到的问题是它更新了我在创建中添加但未在更新中添加的字段。我正在尝试使用@DynamicUpdate和@SelectBeforeUpdate，但它仍然遵循相同的行为。

Controller

@RestController
@RequestMapping("/v01")
@Slf4j
public class ProjectController {

@Autowired
private ProjectServiceIface projectService;


@PostMapping(path = "/project", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Project> createProject(@Valid @RequestBody Project project, BindingResult result){
    if(result.hasErrors()){
        throw new BusinessServiceException(result.getFieldError().getDefaultMessage(), result.getFieldError().getField() + " " + result.getFieldError().getCode());
    }
    Project projectSaved = projectService.createProject(project);
    HttpHeaders headers = new HttpHeaders();
    headers.add("Location", projectSaved.getId().toString());

    return new ResponseEntity<>(project, headers, HttpStatus.CREATED);
}

@PatchMapping(path = "/project", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Project> updateProject(@Valid @RequestBody Project project, BindingResult result){
    if(result.hasErrors()){
        throw new BusinessServiceException(result.getFieldError().getDefaultMessage(), result.getFieldError().getField() + " " + result.getFieldError().getCode());
    }
    Project projectUpdated = projectService.updateProject(project);

    if(projectUpdated == null) {
        return new ResponseEntity<>(null, new HttpHeaders(), HttpStatus.NOT_FOUND);
    }
    HttpHeaders headers = new HttpHeaders();
    headers.add("Location", projectUpdated.getId().toString());

    return new ResponseEntity<>(projectUpdated, headers, HttpStatus.CREATED);
}
}

服务

@Service
public class ProjectServiceImpl implements ProjectServiceIface {

@Autowired
private ProjectRepository projectRepository;

@Autowired
private ProjectRepository projectRepository;

@Override
public Project createProject(Project project) {
    Project projectFound = projectRepository.findByName(project.getName());
    if(projectFound != null){
        throw new BusinessServiceException(Constants.FUNCTIONAL_ERROR, "The Project already exists");
    }
    project.setCreateTime(new Date());

    Project projectSaved = projectRepository.save(project);
    return projectSaved;
}

@Override
public Project findProjectById(String id) {
    Project projectFound = null;
    if(!StringUtils.isNumeric(id)){
        throw new BusinessServiceException(Constants.FUNCTIONAL_ERROR, "The ID is not in a correct format");
    }
    Optional<Project> projectOptional = projectRepository.findById(Integer.valueOf(id));
    if(projectOptional.isPresent()){
        projectFound = projectOptional.get();
    }
    return projectFound;
}

@Override
public Project updateProject(Project project) {
    Project projectUpdated = null;
    Optional<Project> projectFound = projectRepository.findById(project.getId());
    if(projectFound.isPresent()){
        project.setUpdateTime(new Date());
        //Project projectMapped = EntityMapper.projectMapper(project);
        projectUpdated = projectRepository.save(project);
    }
    return projectUpdated;
}

@Override
public Project findProjectByName(String projectName) {
    Project project = projectRepository.findByName(projectName);

    return project;
}
}

存储库

public interface ProjectRepository extends CrudRepository<Project, Integer> {

@Query(value = "SELECT * FROM project p WHERE p.name = :projectName", nativeQuery = true)
Project findByName(String projectName);

 }

项目（实体）

@Entity
@Data
@DynamicUpdate
@SelectBeforeUpdate
@Table(name = "project")
public class Project implements Serializable {
private static final long serialVersionUID = -6163778458602900643L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@NotEmpty
private String name;
@NotEmpty
private String tag;
private String icon;
@Column(name = "create_user", updatable = false)
private String createUser;
@Column(name = "update_user")
private String updateUser;
@Column(name = "create_time", updatable = false)
private Date createTime;
@Column(name = "update_time")
private Date updateTime;
}

这是我用于创建的请求：

{
"name" : "Test12",
"tag" : "TST",
"icon" : "/var/usr"
}

我得到的答复：

{
"id": 5,
"name": "Test12",
"tag": "TST",
"icon": "/var/usr",
"createUser": null,
"updateUser": null,
"createTime": "2020-01-24T22:33:48.499+0000",
"updateTime": null
}

这是我执行的更新请求：

{
"id": 5,
"name": "Test5",
"tag": "AAA"
}

我得到的答复：

{
"id": 5,
"name": "Test67",
"tag": "AAA",
"icon": null,
"createUser": null,
"updateUser": null,
"createTime": null,
"updateTime": "2020-01-24T22:44:50.914+0000"
}

如您所见，icon和createTime都被设置为null。我只想专门更新我在请求/实体中发送的字段。

Answer 1

您可以使用Spring DataRestsPatch方法，或在EntityManager上显式调用merge

Answer 2

如果您共享要插入/更新的代码，将会很有帮助在创建时删除实体类中的updatable = false

问题是您没有从数据库中获取Project的值..您正在数据库中检查值是否存在，但不存在以JSON发送的值保存在Project Json图标中

修复，您需要获取基于ID的值并再次设置将要更改的值。这种方式将检索旧值并更新新值