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This is evidenced by the methods and properties of the .
And while each username is guaranteed to be unique within an application, the same username may be used in different applications using the same user store. To achieve this, click the Relationship icon in the Toolbar to launch the Foreign Key Relationships dialog box.The presence of this constraint ensures relational integrity between the two tables by guaranteeing that there will never be a guestbook entry referring to a non-existent user account.By default, a foreign key constraint will disallow a parent record to be deleted if there are corresponding child records.(Currently, the application's data model contains only the application services tables needed by the .) Let's create a very simple guestbook application where an authenticated user can leave a comment.In addition to storing guestbook comments, let's allow each user to store his home town, homepage, and signature.(Alternatively, you can launch this dialog box by going to the Table Designer menu and choosing Relationships.) Click the Add button in the lower left corner of the Foreign Key Relationships dialog box.
This will add a new foreign key constraint, although we still need to define the tables that participate in the relationship.
The table illustrates how to store information that shares a one-to-many relationship with user accounts.
Since each user account may have an arbitrary number of associated comments, this relationship is modeled by creating a table to hold the set of comments that includes a column that links back each comment to a particular user. We now need to associate three columns with each user account to store the user's home town, homepage, and signature, which will appear in his guestbook comments.
The Membership API includes methods for validating credentials, retrieving information about the currently logged on user, creating a new user account, and deleting a user account, among others.
Each user account in the Membership framework contains only the properties needed for validating credentials and performing essential user account-related tasks.
Figure 5: Configure the Foreign Key Constraint to Cascade Deletes (Click to view full-size image) To save the foreign key constraint, click the Close button to exit out of the Foreign Key Relationships.