Question

我有两个映射实体，AssignmentOpsEntity 和 ConventionalOptionEntity。我想删除一个包含所有 AssignmentOpsEntity 的 conventionalOption。所以我从AssignmentOpsEntity中删除了所有conventionalOption，然后我从数据库中删除了conventionalOption，最后我删除了对象AssignmentOpsEntity。但我有以下错误。

<块引用>

错误：更新或删除表“assignmentopsentity”违反表上的外键约束“fkll31qdog9ye067ybhltjey6u7” “conventionaloptionentity”细节：关键 (assignmentopsid)=(8bf4a6b3-c09e-4da1-a88d-d49d9f7b63f6) 还是引用自表“conventionaloptionentity”。

@Entity
public class AssignmentOpsEntity {

  @OneToMany(mappedBy = "assignmentOps", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
  private Set<ConventionalOptionEntity> conventionalOption;

  public void removeConventionalOption(Set<ConventionalOptionEntity> conventionalOption) {
    this.conventionalOption.removeAll(conventionalOption);
    conventionalOption.forEach(item -> item.assignmentOps(null));
  }

}

@Entity
public class ConventionalOptionEntity {
    
    @JsonIgnore
    @ManyToOne(fetch = FetchType.LAZY)
    private AssignmentOpsEntity assignmentOps;
    
}

public void on(OpsDetachedFromAgreementEvent event) {
    Optional<AssignmentOpsEntity> assignmentOpsEntityOptional = assignmentOpsRepository.findById(event.assignmentOpsId);
    if (assignmentOpsEntityOptional.isPresent()) {
        AssignmentOpsEntity assignmentOpsEntity = assignmentOpsEntityOptional.get();
        assignmentOpsEntity.removeConventionalOption(assignmentOpsEntity.getConventionalOption());
        conventionalOptionRepository.deleteAll(assignmentOpsEntity.getConventionalOption());
        assignmentOpsRepository.delete(assignmentOpsEntity);
    }
}

Answer 1

@OneToMany(mappedBy = "assignmentOps", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private Set<ConventionalOptionEntity> conventionalOption;

CascadeType.ALL 在这里表示删除父实体时会删除 conventionalOption 个实体

这里是你需要的代码

public void on(OpsDetachedFromAgreementEvent event) {
    Optional<AssignmentOpsEntity> assignmentOpsEntityOptional = assignmentOpsRepository.findById(event.assignmentOpsId);
    if (assignmentOpsEntityOptional.isPresent()) {
        assignmentOpsRepository.delete(assignmentOpsEntity);
    }
}

jpa - 删除 OneToMany 违反外键约束

1 个答案: