Java 删除父实体抛出org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException:引用完整性约束冲突

所以我有两个表：projectStatus和projectStatusHistory。
创建新项目时，将在projectStatus表中插入一条新记录。项目启动或状态更改后，将在projectStatusHistory表中插入一条记录（该记录的内容来自projectStatus表），然后在projectStatus表中更新项目状态。当一个项目完成时，我们将把最后一条记录归档到历史记录表中，projectStatus表将不再有该项目的记录

但是

projectStatusRepository.delete（projectStatusId）

会引发异常

原因：org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException:引用完整性约束冲突：“FKIB57NUSJBIJ4K8G83MFNY6V06

---

您无法删除

ProjectStatus

实体，因为它具有与子实体建立的外键

ProjectStatusHistory

。因此，该约束不允许您删除父实体，因为它会使子实体成为孤儿。具有相同属性序列的两个关系可能是需要解决的建模问题gin with.@code\u这在DB2中工作，但在H2中不工作。我从未使用过DB2，所以不确定，您是否在那里自己创建了db？并且可能错过了外键约束，可能是。不，我没有创建DB2表，

@Entity
@Table(name = "projectStatus", schema = "test")
public class ProjectStatus {
    @EmbeddedId
    private ProjectStatusId id;
    
    @Column(name = "projectName", nullable = false)
    private String projectName;
    
    @Column(name = "createDate", nullable = false)
    @Temporal(TemporalType.DATE)
    private Date createDate;
    
    @Column(name = "status", nullable = false)
    private String status;

    @Column(name = "statusUpdateDate", nullable = false)
    private Date statusUpdateDate;  

    @OneToMany(cascade = {CascadeType.MERGE, CascadeType.PERSIST}, fetch = FetchType.EAGER, mappedBy = "projectStatus")
    private List<projectStatusHistory> history;
}

@Embeddable
public class ProjectStatusId implements Serializable {
    @Column(name = "projectName", nullable = false)
    private String projectName;
    
    @Column(name = "createDate", nullable = false)
    @Temporal(TemporalType.DATE)
    private Date createDate;
}

@Entity
@Table(name = "projectStatusHistory", schema = "test")
public class ProjectStatusHistory {

    @EmbeddedId
    private ProjectStatusHistoryId id;
    
    @Column(name = "projectName", nullable = false)
    private String projectName;
    
    @Column(name = "createDate", nullable = false)
    @Temporal(TemporalType.DATE)
    private Date createDate;
    
    @Column(name = "status", nullable = false)
    private String status;

    @Column(name = "statusUpdateTimeStamp", nullable = false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date statusUpdateTimeStamp;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumns({@JoinColumn(name = "projectName", insertable = false, updatable = false),
            @JoinColumn(name = "createDate", insertable = false, updatable = false)})
    private ProjectStatus projectStatus;

}

@Embeddable
public class ProjectStatusHistoryId implements Serializable {

    @Column(name = "projectName", nullable = false)
    private String projectName;
    
    @Column(name = "createDate", nullable = false)
    @Temporal(TemporalType.DATE)
    private Date createDate;

    @Column(name = "statusUpdateTimeStamp", nullable = false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date statusUpdateTimeStamp;
}

public interface ProjectStatusRepository extends JpaRepository<ProjectStatus, ProjectStatusId> {
}

public interface ProjectStatusHistoryRepository extends JpaRepository<ProjectStatusHistory, ProjectStatusHistoryId> {
}

public void projectStatusChanged(ProjectStatusId projectStatusId){
    ProjectStatus projectStatus =  projectStatusRepository.findById(projectStatusId);
    //move current status to history table and then update status 
    projectStatusHistory = createANewProjectStatusHistoryFromProjectStatus(projectStatus);
    projectStatus.status = newStatus;
    projectStatus.History = projectStatusHistory;
    projectStatusRepository.save(projectStatus);
}

public void projectComplete(ProjectStatusId projectStatusId){
    ProjectStatus projectStatus =  projectStatusRepository.findById(projectStatusId);
    //move current status to history table and then update status 
    projectStatusHistory = createANewProjectStatusHistoryFromProjectStatus(projectStatus);
    projectStatusHistoryRepository.save(projectStatusHistory);
    projectStatusRepository.delete(projectStatusId);
}