gpt4 book ai didi

how to apply add-migration and update-database command in webapi when it shows some error?(当webapi显示一些错误时,如何使用添加-迁移和更新-数据库命令?)

转载 作者:bug小助手 更新时间:2023-10-25 16:33:04 25 4
gpt4 key购买 nike



I am trying to add-migration with the name Initial and when i update the database it shows some error, so how can i resolve that error.

我正在尝试添加名为Initial的迁移,当我更新数据库时,它显示了一些错误,那么我如何解决这个错误。


enter image description here
Introducing FOREIGN KEY constraint 'FK_Books_BooksCovers_BookCoverId' on table 'Books' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Could not create constraint or index.

在表“Books”上引入FOREIGN KEY约束“FK_Books_BooksCovers_BookCoverId”可能会导致循环或多个级联路径。指定ON UPDATE NO ACTION或ON UPDATE NO ACTION,或修改其他FOREIGN KEY约束。无法创建约束或索引。


i want to update-database and add table in the database

我想要更新数据库并在数据库中添加表


更多回答
优秀答案推荐

I understand that when creating a foreign key constraint, you may have concerns about data deletion or updates causing cascading effects. That's why you have the option to set the ON DELETE and ON UPDATE actions. By selecting NO ACTION, you can prevent any automatic cascading actions from occurring when a referenced record is deleted or updated. This is a great way to keep your data consistent and avoid any unintended consequences.

我理解,在创建外键约束时,您可能会担心数据删除或更新会导致级联影响。这就是为什么您可以选择设置ON DELETE和ON UPDATE操作的原因。通过选择无操作,可以防止在删除或更新引用的记录时发生任何自动级联操作。这是保持数据一致性并避免任何意想不到的后果的好方法。


更多回答

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com