How to add foreign key relationship in Entity Fram

问题:

Click here to see how to do it while using a code first approach. Below the original database first approach question and answer.

I am using Entity Designer to create a database first model. Now I want to create a foreign key relationship between ProductId and ProductId (see below). I looked at the "add new association" but I cannot connect the two items. Can someone more experienced tell me how to accomplish this?

回答1:

According to Relationships/Associations with the EF Designer, the steps to create a foreign key association are:

1. Right-click an empty area of the design surface, point to Add New, and select Association….
2. Fill in the settings for the association in the Add Association dialog.

...being sure to check the Add foreign key properties to the Entity checkbox when filling in the relationship details.

See also: Relationships, Navigation Properties, and Foreign Keys

回答2:

If you are using the database first approach, it's better to create the foreign key on the database and update the model. Of course, this is true if you can modify the database; if not, you're stuck with the option of creating the referential constraint on the model.

回答3:

To answer the bonus question:

If you have SQL Management Studio installed then you can very easily use the Database Migration wizard (right click on a database, "Tasks", "Deploy Database to SQL Azure") and from there fill the textboxes with the required information that you get from Azure.

Also, make sure to add your IP to the ignore list in Azure or else you won't be able to upload. This can be done in the Azure webportal.