列出引用特定表中特定列的所有外键约束 | 列出引用特定表中特定列的所有外键约束

本文介绍了列出引用特定表中特定列的所有外键约束的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我希望看到所有通过缺省ON DELETE = CASCADE设置的外键约束引用（直接或间接）main表中特定列的所有表和列的列表。 p>

棘手的部分是将会有一个间接的关系被埋在5层深处。（例如：...曾孙 - > FK3 =>孙辈=> FK2 =>小孩=> FK1 =>主表）。我们需要挖掘叶桌，而不仅仅是第一级。关于这一点的好部分是执行速度不受关注，它将运行在生产分贝的备份副本上，以解决未来的任何关系问题。

我做了 SELECT * FROM sys.foreign_keys ，但是这给了我约束的 - 不是父子的名字关系中的表和列（多汁的位）。另外，前面的设计人员使用了短的，非描述性的/随机的名字作为FK的约束，与我们下面的练习不同

我们向SQL Server添加约束的方式：（用户ID）

$ b $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $' b $ b REFERENCES [dbo]。[UserMasterTable]（[UserId]）
ON DELETE CASCADE
GO

ALTER TABLE [dbo]。[UserEmailPrefs] CHECK CONSTRAINT [FK_UserEmailPrefs_UserMasterTable_UserId]
GO

启发了这个问题。

$ b $ EXEC sp_fkeys'Users'

希望我能从今年的+40年下降到未来几年的一些额外的智慧词：

I would like to see a list of all the tables and columns that refer (either directly or indirectly) a specific column in the 'main' table via a foreign key constraint that has the ON DELETE=CASCADE setting missing.

The tricky part is that there would be an indirect relationships buried across up to 5 levels deep. (example: ... great-grandchild-> FK3 => grandchild => FK2 => child => FK1 => main table). We need to dig up the leaf tables-columns, not just the very 1st level. The 'good' part about this is that execution speed isn't of concern, it'll be run on a backup copy of the production db to fix any relational issues for the future.

I did SELECT * FROM sys.foreign_keys but that gives me the name of the constraint - not the names of the child-parent tables and the columns in the relationship (the juicy bits). Plus the previous designer used short, non-descriptive/random names for the FK constraints, unlike our practice below

The way we're adding constraints into SQL Server:

ALTER TABLE [dbo].[UserEmailPrefs]
WITH CHECK ADD  CONSTRAINT [FK_UserEmailPrefs_UserMasterTable_UserId] FOREIGN KEY([UserId])
REFERENCES [dbo].[UserMasterTable] ([UserId])
ON DELETE CASCADE
GO

ALTER TABLE [dbo].[UserEmailPrefs] CHECK CONSTRAINT [FK_UserEmailPrefs_UserMasterTable_UserId]
GO

The comments in this SO question inspired this question.

解决方案

A wiser version of myself stumbles upon a question from the curious, younger version of myself. The answer is

EXEC sp_fkeys 'Users'

Hoping me from +40 years drop by this week for some additional words of wisdom for the years ahead :)

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