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14-6. Optimistic Concurrency with Table Per Type Inheritance ....................................524
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Problem ................................................................................................................................................ 524 Solution ................................................................................................................................................ 524 How It Works ........................................................................................................................................ 527
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14-7. Generating a Timestamp Column with Model First ..............................................527
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Problem ................................................................................................................................................ 527 Solution ................................................................................................................................................ 527 How It Works ........................................................................................................................................ 528
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15: Advanced Modeling.........................................................................529 15-1. Creating an Association on a Derived Entity ........................................................529
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Problem ................................................................................................................................................ 529 Solution ................................................................................................................................................ 529 How It Works ........................................................................................................................................ 531
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15-2. Mapping an Entity to Customized Parts of One or More Tables ...........................532
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Problem ................................................................................................................................................ 532 Solution ................................................................................................................................................ 532 How It Works ........................................................................................................................................ 534
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15-3. Creating Conditional Associations........................................................................536
Problem ................................................................................................................................................ 536 Solution ................................................................................................................................................ 536 How It Works ........................................................................................................................................ 541
15-4. Fabricating Additional Inheritance Hierarchies ....................................................542
Problem ................................................................................................................................................ 542 Solution ................................................................................................................................................ 542 How It Works ........................................................................................................................................ 545
15-5. Sharing Audit Fields Across Multiple Entities.......................................................547
Problem ................................................................................................................................................ 547 Solution ................................................................................................................................................ 547 How It Works ........................................................................................................................................ 551
15-6. Modeling a Many-to-Many Relationship with Payload.........................................553
Problem ................................................................................................................................................ 553 Solution ................................................................................................................................................ 553 How It Works ........................................................................................................................................ 555
15-7. Mapping a Foreign Key Column to Multiple Associations ....................................556
Problem ................................................................................................................................................ 556 Solution ................................................................................................................................................ 557 How It Works ........................................................................................................................................ 562
15-8. Using Inheritance to Map a Foreign Key Column to Multiple Associations ..........564
Problem ................................................................................................................................................ 564 Solution ................................................................................................................................................ 564 How It Works ........................................................................................................................................ 567
15-9. Creating Read-only and Computed Properties .....................................................568
xxviii
CONTENTS
Problem ................................................................................................................................................ 568 Solution ................................................................................................................................................ 568 How It Works ........................................................................................................................................ 574
15-10. Mapping an Entity to Multiple Tables.................................................................576
Problem ................................................................................................................................................ 576 Solution ................................................................................................................................................ 576 How It Works ........................................................................................................................................ 577
15-11. Mapping an Entity to Multiple Entity Sets (MEST) ..............................................578
Problem ................................................................................................................................................ 578 Solution ................................................................................................................................................ 578 How It Works ........................................................................................................................................ 583
15-12. Extending Table per Type with Table per Hierarchy...........................................585
Problem ................................................................................................................................................ 585 Solution ................................................................................................................................................ 585 How It Works ........................................................................................................................................ 588
Index ...................................................................................................................591
xxix
About the Authors
Larry Tenny has more than 20 years of experience developing applications using a broad range of development tools primarily targeting the Windows platform. He has extensive .NET development experience from its initial community preview as Next Generation Windows Services to the latest .NET 4.0 release. He has a PhD in Computer Science from Indiana University.
Zeeshan Hirani is a longtime .NET and database developer. He is a senior developer at a top Internet e-commerce site using Entity Framework, ASP.NET, Silverlight, and many other Microsoft technologies. He has extensive experience with many ORM and database technologies, which provides him with a unique perspective on Microsoft s Entity Framework. He has written several articles, maintains an influential Entity Framework blog, and is a frequent contributor to many .NET forums. He is a Microsoft MVP.
ABOUT THE TECHNICAL REVIEWERS
About the Technical Reviewers
David Annesley-DeWinter has worked with and implemented business solutions on the .NET platform since .NET 1.1, leveraging a background in rich data modeling using ORM (object-role modeling) to drive data requirements for organizations. After working in industry on a variety of applications ranging from highly concurrent middleware services to customer-facing rich client and web applications, David moved to Washington and now works on the Entity Framework team at Microsoft, where he focuses on features for object services like the POCO templates and Code First. In his spare time, David enjoys photography and rowing for the Sammamish Rowing Association in Redmond. You can read more about his experiences with the Entity Framework and other .NET-related topics on his blog at http://blogs.rev-net.com/ddewinter/ and follow him on Twitter at @ddewinter.
Brian Swan spent 14 years teaching high-school and junior-college mathematics and dabbled in teaching introductory computer science courses before making the jump to a career in technology. After a brief stint at Amazon Web Services as a support engineer, he joined Microsoft where he has been focused on learning and writing about various data access technologies. In his spare time he is an amateur husband, father, mountain biker, back packer, runner, and beer drinker.
xxxi
Acknowledgments
Without a doubt, this book required an enormous amount of research and countless hours of discovering the common problems that developers face with Entity Framework. For months, we pestered the Entity Framework Development Team and others in the forums and in hundreds of e-mails. We found the team and the Internet community extremely patient and willing to help us explore this technology and understand the problems developers often encounter. For this we are deeply grateful. In particular, we would like to thank Diego Vega, Microsoft Program Manager, for sharing his valuable knowledge and expertise. Throughout the writing of this book, Diego shed light into many areas where our knowledge fell short. Without his explanations we would not have been able to deliver the breadth and depth of content represented in this book. We also would like to thank Noam Ben-Ami, Microsoft Program Manager, who answered many of our questions about Entity Framework Designer. Noam provided incredibly important insight into some of the most interesting aspects of Entity Framework. We would like to thank our technical editors, David Annesley-DeWinter and Brian Swan, for their careful and meticulous review of every recipe. The technical reviewers worked through each recipe and provided us with very valuable advice throughout the process. So much of what this book is is due to the professionalism and guidance of the many people at Apress. Our editor, Jonathan Gennick, is not only a helpful guide but also a good friend and a writing mentor. Our coordinating editor, Mary Tobin, provided the steady guidance and clock-like cadence that kept this massive project humming along even when the writers struggled to keep up. Nancy Sixsmith, our very patient copy editor, checked (and often corrected) every word with machine-like precision. To all the wonderful people at Apress, thank you so much. Finally, we want to thank our families, friends, and co-workers for putting up with a couple of overly excited developers turned writers.
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