sqlite SQL删除一对一关系行

vyu0f0g1 于 2023-10-23 发布在 SQLite

关注(0)|答案(2)|浏览(153)

我有这两个实体：

export class MyEntity {
    ...

    @OneToOne(() => Item, (item) => item.entity)
    item: Item:

    @ManyToOne(() => User, (user) => user.createdMyEntities)
    createdBy: User;

    ...
}

export class Item {
    ...

    @OneToOne(() => MyEntity, (myEntity) => myEntity.item)
    @JoinColumn()
    entity: MyEntity;

    ...
}

我想删除MyEntity中的一行，但这将给予一个SQLITE_CONSTRAINT: FOREIGN KEY constraint failed错误。我不想同时删除Item，我只想删除MyEntity并删除与它的关系。
我怎么能这么做呢？

sqlite

来源：https://stackoverflow.com/questions/76913570/sql-delete-row-with-one-to-one-relation

2条答案

按热度按时间

jmp7cifd1#

删除一对一关系可能会很棘手，因为有时它会给予Foreign Key错误，您可以使用多个级联选项来查看是否有任何工作。另一个可行的解决方法是选择（）您想要删除的行并基于外键连接，然后对于出现的行，您可以简单地更新这些外键列以删除关系，最后您可以删除所需的行。我附上示例代码供您参考：

// Assuming you have a repository or a database connection instance
const myEntityRepository = /* Initialize your repository or connection */ ;

// Find the MyEntity instance you want to delete
const myEntityToDelete = await myEntityRepository.findOne( /* your conditions here */ );

if (myEntityToDelete) {
  // Remove the association between MyEntity and Item
  myEntityToDelete.item = null;

  // Save the changes to update the entity without the association
  await myEntityRepository.save(myEntityToDelete);

  // Now you can safely delete the MyEntity instance
  await myEntityRepository.remove(myEntityToDelete);
}

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bogh5gae2#

在@OneTOOne关系定义中，将cascade设置为persistent，并仅合并。

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