Primary key tanımlamadığınız zaman aşağıdaki gibi hata almaktayız:
Unable to update the EntitySet '...' because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.
EF 4.0 composite key (çok alanlı primary key tanımı) tanımını desteklemektedir. Özellikle bu tanım map tablolarında çok kullanılmaktadır.
Bir tabloda composite primary key yapma:
http://stackoverflow.com/questions/1545571/how-do-i-make-a-composite-key-with-sql-server-management-studio
Kaynaklar:
http://stackoverflow.com/questions/7583770/unable-to-update-the-entityset-because-it-has-a-definingquery-and-no-updatefu
http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/220262bd-85d4-4f29-96a8-4a7d1d2c8293/
http://blogs.msdn.com/b/adonet/archive/2008/05/22/how-referential-integrity-works.aspx
http://www.luisrocha.net/2010/11/creating-composite-keys-using-code.html
http://stackoverflow.com/questions/1925632/composite-db-keys-with-entity-framework-4-0?rq=1
http://sadullahkeles.wordpress.com/2011/04/18/entity-framework-insert-hatasi/
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