Question

我正在开发一个spring mvc app，其中我有2个型号。 Tripstop和物品交易。以下是我的tripstop模型：

   import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;

@Entity
@Table(name="TripStop")
public class TripStopModel {
    @Id
    @Column(name="tripstopid")
    @GeneratedValue 
    private Integer tripStopId;

    @Column(name="datetime")
    private String tripStopDateTime;

    @Column(name="createts")
    private Date tripStopCreateTime;

    @Column(name="latitude")
    private double latitude;

    @Column(name="longitude")
    private double longitude;

    @ManyToOne(optional=true)
    @JoinColumn(name="locationid")
    private LocationModel locationModel;

    @ManyToOne(optional=true)
    @JoinColumn(name="userid", referencedColumnName="SYSTEMUSERID")
    private UserModel userModel;

    @ManyToOne(optional=true)
    @JoinColumn(name="tripid")
    private TripModel tripModel;

    @OneToMany(mappedBy = "tripStopModel", cascade = CascadeType.REMOVE, orphanRemoval = true)
    private List<ItemTransactionModel> itemTransactionModelList;

    @ManyToOne(optional = true)
    @JoinColumn(name="tid")
    private CircleModel circleModel;
}

以下是我的商品交易模型：

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="itemTx")
public class ItemTransactionModel {

    @Id
    @Column(name="itemTxid")
    @GeneratedValue 
    private Integer itemTxId;

    @Column(name="itemcode")
    private String itemCode;

    @Column(name="weight")
    private String weight;

    @Column(name="bagcount")
    private Integer bagCount;   

    @ManyToOne(optional=true)
    @JoinColumn(name="tripstopid")
    private TripStopModel tripStopModel;
}

以下是我用来删除tripstop的代码：

Session session = sessionFactory.getCurrentSession();
        session.delete(tripStopModel);

我希望当我删除tripstop时，来自itemtx的相关记录也应该被删除。为此，我使用级联类型删除。

但是没有一个被删除，而且会引发以下错误：

org.hibernate.exception.ConstraintViolationException: could not execute statement

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails

tripstopid是itemtx表中的外键。

JPA级联类型REMOVE引发SQL错误

0 个答案: