使用springboot编写一套实体类为Approval的基本的crud接口

好的，下面是Approval实体类的基本CRUD接口实现：

1. 定义Approval实体类

@Entity
@Table(name = "approval")
public class Approval {
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String name;
    
    private String description;
    
    // getters and setters
}

2. 创建ApprovalRepository接口

@Repository
public interface ApprovalRepository extends JpaRepository<Approval, Long> {}

3. 创建ApprovalService接口和实现类

public interface ApprovalService {
    
    Approval create(Approval approval);
    
    Approval update(Long id, Approval approval);
    
    void delete(Long id);
    
    Approval findById(Long id);
    
    List<Approval> findAll();
}

@Service
public class ApprovalServiceImpl implements ApprovalService {
    
    @Autowired
    private ApprovalRepository approvalRepository;
    
    @Override
    public Approval create(Approval approval) {
        return approvalRepository.save(approval);
    }
    
    @Override
    public Approval update(Long id, Approval approval) {
        Approval existingApproval = findById(id);
        existingApproval.setName(approval.getName());
        existingApproval.setDescription(approval.getDescription());
        return approvalRepository.save(existingApproval);
    }
    
    @Override
    public void delete(Long id) {
        approvalRepository.deleteById(id);
    }
    
    @Override
    public Approval findById(Long id) {
        return approvalRepository.findById(id)
                .orElseThrow(() -> new NoSuchElementException("Approval not found with id " + id));
    }
    
    @Override
    public List<Approval> findAll() {
        return approvalRepository.findAll();
    }
}

4. 创建ApprovalController类

@RestController
@RequestMapping("/approvals")
public class ApprovalController {
    
    @Autowired
    private ApprovalService approvalService;
    
    @PostMapping
    public Approval create(@RequestBody Approval approval) {
        return approvalService.create(approval);
    }
    
    @PutMapping("/{id}")
    public Approval update(@PathVariable Long id, @RequestBody Approval approval) {
        return approvalService.update(id, approval);
    }
    
    @DeleteMapping("/{id}")
    public void delete(@PathVariable Long id) {
        approvalService.delete(id);
    }
    
    @GetMapping("/{id}")
    public Approval findById(@PathVariable Long id) {
        return approvalService.findById(id);
    }
    
    @GetMapping
    public List<Approval> findAll() {
        return approvalService.findAll();
    }
}

至此，我们就完成了一个基本的Approval实体类的CRUD接口。