The DELETE statement conflicted with the REFERENCE constraint in ASP.NET Dynamic Data

问题

I have two tables Application_User and Application_User_Access. Application_User_Access table is having a foreign key constraint with Application_User table.

When I delete a record in Application_User table, I receive "The DELETE statement conflicted with the REFERENCE constraint" exception.

This happens in ASP.NET Dynamic Data Entities Web application. I want to delete all the child records in this case and finally delete the parent record. How to implement this?

回答1:

You can implement a cascading delete for Application_User_Access table. For this you need to modify your DB schema a little bit. Concretely remove the previous reference from the Application_User_Access to the Application_User table and add a new one:

--not sure about the column names though

ALTER TABLE Application_User_Access
ADD CONSTRAINT FK_Application_User_Access_Application_User
FOREIGN KEY (used_id)
REFERENCES Application_User(id)
ON DELETE CASCADE
GO

Notice that ON DELETE CASCADE thing. It means that whenever the primary key record is deleted the foreign key record referencing it will be removed as well.

来源：https://stackoverflow.com/questions/7894411/the-delete-statement-conflicted-with-the-reference-constraint-in-asp-net-dynamic