不得执行语句； sql [n/a];约束[primary];嵌套的异常是org.hibernate.exception.constraintviolationException

Question

I使用Java/Spring Boot创建了一个CRUD RESTFUL API应用程序。我有一个Mariadb，其中包含员工列表和内部相关数据。我正在使用MySQL Workbench作为我的SQL客户端。 运行Spring Boot应用程序时没有错误。我的数据库中没有错误。当我在数据库中获取所有工程师的API时，没有错误。 我的“ get”请求正常工作；但是，“邮政”没有。我无法创建一个新员工，而无需直接使用MySQL WB插入数据库。 我希望能够通过

Postman创建一个新员工。

，您可以看到抛出了一个约束violationException。相反是我的主要钥匙，即“ id”。我将其设置为在MySQLWB.

中自动插入。

在这里是我的工程师类的代码：

package engineermanagement.model;

import org.springframework.data.jpa.domain.support.AuditingEntityListener;
import javax.persistence.*;

@Entity
@Table(name = "Engineers")
@EntityListeners(AuditingEntityListener.class)
public class Engineer {

    private Long id;
    private String firstName;
    private String lastName;
    private String sid;
    private String email;
    private String manager;
    private Boolean teamLead;
    private String groupName;
    private String shift;
    private int startTime;
    private int endTime;


    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }

    @Column(name = "first_name", nullable = false)
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Column(name = "last_name", nullable = false)
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    @Column(name = "eid", nullable = false)
    public String getEid() {
        return eid;
    }
    public void setEid(String eid) {
        this.sid = eid;
    }

    @Column(name = "email", nullable = false)
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

    @Column(name = "manager", nullable = false)
    public String getManager() {
        return manager;
    }
    public void setManager(String manager) {
        this.manager = manager;
    }

    @Column(name = "teamlead", nullable = false)
    public Boolean getTeamLead() {
        return teamLead;
    }
    public void setTeamLead(Boolean teamLead) {
        this.teamLead = teamLead;
    }

    @Column(name = "group_name", nullable = false)
    public String getGroupName() {
        return groupName;
    }
    public void setGroupName(String groupName) {
        this.groupName = groupName;
    }

    @Column(name = "shift", nullable = false)
    public String getShift() {
        return shift;
    }
    public void setShift(String shift) {
        this.shift = shift;
    }

    @Column(name = "start_time", nullable = false)
    public int getStartTime() {
        return startTime;
    }
    public void setStartTime(int startTime) {
        this.startTime = startTime;
    }

    @Column(name = "end_time", nullable = false)
    public int getEndTime() {
        return endTime;
    }
    public void setEndTime(int endTime) {
        this.endTime = endTime;
    }
}

这是我的engineercontrollerclass：

package jpmchase.controller;

import jpmchase.exception.*;
import jpmchase.model.Engineer;
import jpmchase.repository.EngineerRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import javax.validation.Valid;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@RestController
@RequestMapping("/api/v1")
public class EngineerController {

    @Autowired
    private EngineerRepository engineerRepository;

    @GetMapping("/engineers")
    public List<Engineer> getAllEngineers() {
        return engineerRepository.findAll();
    }

    @GetMapping("/engineers/{id}")
    public ResponseEntity<Engineer> getEngineerById(
            @PathVariable(value = "id") Long engineerId) throws ResourceNotFoundException {
        Engineer engineer = engineerRepository.findById(engineerId)
                .orElseThrow(() -> new ResourceNotFoundException("Engineer not found on :: "+ engineerId));
        return ResponseEntity.ok().body(engineer);
    }

    @PostMapping("/engineers")
    public Engineer createEngineer(@Valid @RequestBody Engineer engineer) {
        return engineerRepository.save(engineer);
    }

    @PutMapping("/engineers/{id}")
    public ResponseEntity<Engineer> updateEngineer(
            @PathVariable(value = "id") Long engineerId,
            @Valid @RequestBody Engineer engineerDetails) throws ResourceNotFoundException {
        Engineer engineer = engineerRepository.findById(engineerId)
                .orElseThrow(() -> new ResourceNotFoundException("Engineer not found on :: "+ engineerId));
        engineer.setId(engineerDetails.getId());
        engineer.setFirstName(engineerDetails.getFirstName());
        engineer.setLastName(engineerDetails.getLastName());
        engineer.setSid(engineerDetails.getSid());
        engineer.setEmail(engineerDetails.getEmail());
        engineer.setTeamLead(engineerDetails.getTeamLead());
        engineer.setManager(engineerDetails.getManager());
        engineer.setShift(engineerDetails.getShift());
        engineer.setStartTime(engineerDetails.getStartTime());
        engineer.setEndTime(engineerDetails.getEndTime());

//      engineer.setUpdatedAt(new Date());
        final Engineer updatedEngineer = engineerRepository.save(engineer);
        return ResponseEntity.ok(updatedEngineer);
    }

    @DeleteMapping("/engineers/{id}")
    public Map<String, Boolean> deleteEngineer(
            @PathVariable(value = "id") Long engineerId) throws Exception {
        Engineer engineer = engineerRepository.findById(engineerId)
                .orElseThrow(() -> new ResourceNotFoundException("Engineer not found on :: "+ engineerId));

        engineerRepository.delete(engineer);
        Map<String, Boolean> response = new HashMap<>();
        response.put("deleted", Boolean.TRUE);
        return response;
    }
}

使用Postman，我正在尝试“发布”新的“测试”员工，但由于上述约束而失败。任何帮助将不胜感激... Full堆栈跟踪：

2019-01-11 15:26:50.605  WARN 15276 --- [nio-8080-exec-6] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 1062, SQLState: 23000
2019-01-11 15:26:50.606 ERROR 15276 --- [nio-8080-exec-6] o.h.engine.jdbc.spi.SqlExceptionHelper   : Duplicate entry '68' for key 'PRIMARY'
2019-01-11 15:26:50.606 ERROR 15276 --- [nio-8080-exec-6] o.h.i.ExceptionMapperStandardImpl        : HHH000346: Error during managed flush [org.hibernate.exception.ConstraintViolationException: could not execute statement]
2019-01-11 15:26:50.657  WARN 15276 --- [nio-8080-exec-6] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [PRIMARY]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

我也有同样的问题，原因是

o.h.engine.jdbc.spi.SqlExceptionHelper : Duplicate entry '68' for key 'PRIMARY'

.

Hibernate试图为新的Engineer

生成一个ID，但是当它试图遵循由

@GeneratedValue(strategy = GenerationType.AUTO)

指定的生成策略时，它将获得已经存在的ID。 很可能发生这种情况，因为您将新的行添加到

启动器

表中，该表与Hibernate的下一个生成ID值折叠。

同样，如果您不断尝试插入新的工具

Answer 1

要解决问题，您可以将ID生成策略更改为

@GeneratedValue(strategy = GenerationType.IDENTITY)

或继续尝试插入，直到Hibernate达到非使用ID值（如果您想保留相同的生成策略）

org.hibernate.exception.ConstraintViolationException,

例外约束违规意味着您将数据库字段设置为具有非NULL，唯一等的数据库字段。数据库在将数据插入表中之前先检查数据。如果有任何条件不匹配，您将获得约束ViolationException。

在您的情况下，您有主要键违规。因此，是否存在“ ID = 68”的数据库表工程师。如果有余地，请删除行。