Question

我有三张桌子：

CREATE TABLE IF NOT EXISTS `DB`.`global_history` (
  `ID` INT(11) AUTO_INCREMENT,
  `ID_HISTORY` INT(11) NULL,

  PRIMARY KEY (`ID`),

  CONSTRAINT `FK_HISTORY_GLOBAL_HISTORY`
    FOREIGN KEY (`ID_HISTORY`)
    REFERENCES `DB`.`history` (`ID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION);

第二张表：

CREATE TABLE IF NOT EXISTS `DB`.`history` (
  `ID` INT(11) AUTO_INCREMENT,
  `TIMESTAMP` DATETIME NOT NULL,
  PRIMARY KEY (`ID`));*

第三张表：

CREATE TABLE IF NOT EXISTS `DB`.`audit` (
  `ID` INT(11) AUTO_INCREMENT,
  `ID_HISTORY` INT(11) NULL,

  PRIMARY KEY (`ID`),

  CONSTRAINT `FK_HISTORY_AUDIT`
    FOREIGN KEY (`ID_HISTORY`)
    REFERENCES `DB`.`history` (`ID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION);

这些是我的模型类：

全球历史：

@ManyToOne
@JoinColumn(name = "ID_HISTORY", nullable = true)
private History history;

历史记录：

    @OneToMany(mappedBy = "history", fetch = FetchType.EAGER, cascade = { CascadeType.ALL })
@Fetch(value = FetchMode.SUBSELECT)
@Cascade({ org.hibernate.annotations.CascadeType.SAVE_UPDATE })
private List<GloabalHistory> globalHistories;

@ManyToOne
@JoinColumn(name = "ID_AUDIT", nullable = true)
private Audit audit;

审核：

    @OneToMany(mappedBy = "audit", fetch = FetchType.EAGER, cascade = { CascadeType.ALL })
@Fetch(value = FetchMode.SUBSELECT)
@Cascade({ org.hibernate.annotations.CascadeType.SAVE_UPDATE })
private List<History> histories;

但是当我尝试更新History（第二个表）中的一行时，我收到此错误：

- ＆GT;无法删除或更新父行：外键约束失败

Answer 1

您需要在所有一对多关系中使用cascade = CascadeType.ALL，并在服务类中使用@Transactional注释，并在save方法上使用@Transactional(propagation = Propagation.REQUIRED)。并且还在hibernate或Spring配置上启用事务。

无法删除或更新双向关系

1 个答案: