Question

我正在使用Hibernate，MySQL，Spring MVC。

我目前的工作是预订机票。

我从路径变量获得了航班时刻表实体。而且，我从HttpSession获得了一个乘客实体。

以下是控制器代码：

@RequestMapping("/booking/{results[0].flightscheduleId}")
public String bookBoardingPass
    (@PathVariable("results[0].flightscheduleId") Integer flightId, HttpSession session) {

    Passenger passenger = (Passenger) session.getAttribute("user");
    FlightSchedule flightSchedule = this.flightScheduleService.get(flightId);

    this.boardingPassService.booking(flightSchedule, passenger);

    return "search";
}

以下是预订方法代码：

@Override 
public void booking (FlightSchedule flightSchedule, Passenger passenger) {

    BoardingPass ticket = new BoardingPass();
    ticket.setFlightschedule(flightSchedule);
    ticket.setPassenger(passenger);

    System.out.println("flight id: "+flightSchedule.getFlightscheduleId());
    System.out.println("passenger id: "+passenger.getPassengerId());

    this.persist(ticket);
    //sessionFactory.getCurrentSession().saveOrUpdate(ticket);
}

在预订方式中，我可以同时打印flightSchedule个ID和passenger的ID。

但是，当我执行＆＃39;坚持＆＃39;方法，它说Field 'flightschedule_id' doesn't have a default value

在persist方法中，它运行sessionFactory.getCurrentSession().saveOrUpdate(ticket);

flightschedule_id是主键，自动增量，非空。

我不能给它一个默认值。另外，我通过谷歌搜索结果检查phpmyadmin上的STRICT模式（？）。（我不确定我做得好。无论如何它都没有用）。

我该如何解决这个问题？

编辑：

以下是BoardingPass课程：

@Entity
@Table
public class BoardingPass implements java.io.Serializable {

private Integer boardingpassId;
private FlightSchedule flightschedule;
private Passenger passenger;

public BoardingPass() {
}

public BoardingPass(FlightSchedule flightschedule, Passenger passenger) {
    this.flightschedule = flightschedule;
    this.passenger = passenger;
}

@Id
@GeneratedValue(strategy = IDENTITY)

@Column(name = "id", unique = true, nullable = false)
public Integer getBoardingpassId() {
    return this.boardingpassId;
}

public void setBoardingpassId(Integer boardingpassId) {
    this.boardingpassId = boardingpassId;
}

@ManyToOne
@MapsId("flightscheduleId")
public FlightSchedule getFlightschedule() {
    return this.flightschedule;
}

public void setFlightschedule(FlightSchedule flightschedule) {
    this.flightschedule = flightschedule;
}

@ManyToOne
@MapsId("passengerId")
public Passenger getPassenger() {
    return this.passenger;
}

public void setPassenger(Passenger passenger) {
    this.passenger = passenger;
}


}

以防万一，我添加了FlightSchedule和Passenger类的一部分。

下面是FlightSchedule.java：

@Entity
@Table
public class FlightSchedule implements java.io.Serializable {

private Integer flightscheduleId;
private Date depDay;
private Date depTime;
private Date arrDay;
private Date arrTime;
private Double flightTime;
private Integer price;
private Set<BoardingPass> boardingPasses = new HashSet<BoardingPass>(0);
private Airplane airplane;
private Airport depAirport;
private Airport arrAirport;

public FlightSchedule() {
}

public FlightSchedule(Date depDay, Date depTime, Date arrDay, Date arrTime, Integer price) {
    this.depDay = depDay;
    this.depTime = depTime;
    this.arrDay = arrDay;
    this.arrTime = arrTime;
    this.price = price;
}

public FlightSchedule(Date depDay, Date depTime, Date arrDay, Date arrTime, Double flightTime, Integer price,
        Set<BoardingPass> boardingPasses, Airplane airplane, Airport depAirport, Airport arrAirport) {
    this.depDay = depDay;
    this.depTime = depTime;
    this.arrDay = arrDay;
    this.arrTime = arrTime;
    this.flightTime = flightTime;
    this.price = price;
    this.boardingPasses = boardingPasses;
    this.airplane = airplane;
    this.depAirport = depAirport;
    this.arrAirport = arrAirport;
}

@Id
@GeneratedValue(strategy = IDENTITY)

@Column(name = "id", unique = true, nullable = false)
public Integer getFlightscheduleId() {
    return this.flightscheduleId;
}

public void setFlightscheduleId(Integer flightscheduleId) {
    this.flightscheduleId = flightscheduleId;
}

@OneToMany(mappedBy = "flightschedule", cascade = CascadeType.ALL, orphanRemoval = true)
public Set<BoardingPass> getBoardingPasses() {
    return this.boardingPasses;
}

public void setBoardingPasses(Set<BoardingPass> boardingPasses) {
    this.boardingPasses = boardingPasses;
}


.... getters and setters... 

}

下面是Passenger.java：

@Entity
@Table
public class Passenger implements java.io.Serializable {

private Integer passengerId;
private String password;
private String passportNo;
private String passengerName;
private Date birth;
private Integer mileage;
private String contact;
private Set<BoardingPass> boardingPasses = new HashSet<BoardingPass>(0);

public Passenger() {
}

public Passenger(String password, String passportNo, Date birth, Integer mileage) {
    this.password = password;
    this.passportNo = passportNo;
    this.birth = birth;
    this.mileage = mileage;
}

public Passenger(String password, String passportNo, String passengerName, Date birth, Integer mileage, String contact, Set<BoardingPass> boardingPasses) {
    this.password = password;
    this.passportNo = passportNo;
    this.passengerName = passengerName;
    this.birth = birth;
    this.mileage = mileage;
    this.contact = contact;
    this.boardingPasses = boardingPasses;
}

@Id
@GeneratedValue(strategy = IDENTITY)

@Column(name = "id", unique = true, nullable = false)
public Integer getPassengerId() {
    return this.passengerId;
}

public void setPassengerId(Integer passengerId) {
    this.passengerId = passengerId;
}

@OneToMany(mappedBy = "passenger", cascade = CascadeType.ALL, orphanRemoval = true)
public Set<BoardingPass> getBoardingPasses() {
    return this.boardingPasses;
}

public void setBoardingPasses(Set<BoardingPass> boardingPasses) {
    this.boardingPasses = boardingPasses;
}


.... getters and setters...

}

Answer 1

我认为该映射完全错误的第一件事是@MapsId注释：

这些用于告诉hibernate关系属性对应的复合键中的属性。

没有复合主键的含义它没有任何意义，我怀疑它会弄乱你的映射...尝试删除它们并看看它是怎么回事

一个简单的例子http://www.objectdb.com/api/java/jpa/MapsId

P.S。我忘了你需要将@JoinColumn注释添加到映射

@JoinColumn(name = "flightschedule_id", referencedColumnName = "boardingPass_id")

编辑：导致问题的原因还在于您指定了db列的名称错误

@Column(name = "id", unique = true, nullable = false)
public Integer getFlightscheduleId() {
    return this.flightscheduleId;
}

不应该是@Column(name = "flightschedule_id", unique = true, nullable = false)？

其他2个实体的相同内容也检查@Column name属性是否对应于db列名

Answer 2

如果您未将PRIMARY KEY列指定为AUTO_INCREMENT，则必须在数据库中手动提供值。将您的flightschedule_id列作为主键AUTO_INCREMENT，然后它应该有效。希望这会有所帮助。谢谢。

Mysql，Hibernate - 当插入表时，它表示Field没有默认值

2 个答案: