Returning a Computed Column from a Model Defined Function ..........................401 in Font

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11-3. Returning a Computed Column from a Model Defined Function ..........................401
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Problem ................................................................................................................................................ 401 Solution ................................................................................................................................................ 401 How It Works ........................................................................................................................................ 404
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11-4. Calling a Model Defined Function from a Model Defined Function ......................404
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Problem ................................................................................................................................................ 404 Solution ................................................................................................................................................ 404 How It Works ........................................................................................................................................ 408
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11-5. Returning an Anonymous Type From a Model Defined Function .........................408
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CONTENTS
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Problem ................................................................................................................................................ 408 Solution ................................................................................................................................................ 408 How It Works ........................................................................................................................................ 411
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11-6. Returning a Complex Type From a Model Defined Function ................................412
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Problem ................................................................................................................................................ 412 Solution ................................................................................................................................................ 412 How It Works ........................................................................................................................................ 415
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11-7. Returning a Collection of Entity References From a Model Defined Function......415
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Problem ................................................................................................................................................ 415 Solution ................................................................................................................................................ 415 How It Works ........................................................................................................................................ 417
11-8. Using Canonical Functions in eSQL......................................................................418
Problem ................................................................................................................................................ 418 Solution ................................................................................................................................................ 418 How It Works ........................................................................................................................................ 419
11-9. Using Canonical Functions in LINQ.......................................................................419
Problem ................................................................................................................................................ 419 Solution ................................................................................................................................................ 419 How It Works ........................................................................................................................................ 421
11-10. Calling Database Functions in eSQL...................................................................422
Problem ................................................................................................................................................ 422 Solution ................................................................................................................................................ 422 How It Works ........................................................................................................................................ 424
11-11. Calling Database Functions in LINQ ...................................................................424
Problem ................................................................................................................................................ 424 Solution ................................................................................................................................................ 424 How It Works ........................................................................................................................................ 425
11-12. Defining Built-in Functions.................................................................................425
xxii
CONTENTS
Problem ................................................................................................................................................ 425 Solution ................................................................................................................................................ 426 How It Works ........................................................................................................................................ 428
12: Customizing Entity Framework Objects ..........................................429 12-1. Executing Code When SaveChanges() Is Called ...................................................429
Problem ................................................................................................................................................ 429 Solution ................................................................................................................................................ 429 How It Works ........................................................................................................................................ 431
12-2. Validating Property Changes ................................................................................432
Problem ................................................................................................................................................ 432 Solution ................................................................................................................................................ 432 How It Works ........................................................................................................................................ 434
12-3. Logging Database Connections............................................................................435
Problem ................................................................................................................................................ 435 Solution ................................................................................................................................................ 435 How It Works ........................................................................................................................................ 437
12-4. Recalculating a Property Value When an Entity Collection Changes....................437
Problem ................................................................................................................................................ 437 Solution ................................................................................................................................................ 437 How It Works ........................................................................................................................................ 439
12-5. Automatically Deleting Related Entities ...............................................................440
Problem ................................................................................................................................................ 440 Solution ................................................................................................................................................ 440 How It Works ........................................................................................................................................ 443
12-6. Deleting All Related Entities .................................................................................443
Problem ................................................................................................................................................ 443 Solution ................................................................................................................................................ 444 How It Works ........................................................................................................................................ 447
xxiii
CONTENTS
12-7. Assigning Default Values......................................................................................447
Problem ................................................................................................................................................ 447 Solution ................................................................................................................................................ 447 How It Works ........................................................................................................................................ 450
12-8. Retrieving the Original Value of a Property ..........................................................451
Problem ................................................................................................................................................ 451 Solution ................................................................................................................................................ 451 How It Works ........................................................................................................................................ 453
12-9. Retrieving the Original Association for Independent Associations.......................454
Problem ................................................................................................................................................ 454 Solution ................................................................................................................................................ 454 How It Works ........................................................................................................................................ 457
12-10. Retrieving XML ...................................................................................................457
Problem ................................................................................................................................................ 457 Solution ................................................................................................................................................ 457 How It Works ........................................................................................................................................ 460
12-11. Applying Server-Generated Values to Properties ...............................................460
Problem ................................................................................................................................................ 460 Solution ................................................................................................................................................ 460 How It Works ........................................................................................................................................ 464
12-12. Validating Entities on SavingChanges ................................................................464
Problem ................................................................................................................................................ 464 Solution ................................................................................................................................................ 464 How It Works ........................................................................................................................................ 469
13: Improving Performance ..................................................................471 13-1. Optimizing Queries in a Table per Type Inheritance Model..................................471
Problem ................................................................................................................................................ 471 Solution ................................................................................................................................................ 471
xxiv
CONTENTS
How It Works ........................................................................................................................................ 472
13-2. Retrieving a Single Entity Using an Entity Key .....................................................473
Problem ................................................................................................................................................ 473 Solution ................................................................................................................................................ 473 How It Works ........................................................................................................................................ 474
13-3. Retrieving Entities for Read Only..........................................................................475
Problem ................................................................................................................................................ 475 Solution ................................................................................................................................................ 475 How It Works ........................................................................................................................................ 476
13-4. Improving the Startup Time..................................................................................477
Problem ................................................................................................................................................ 477 Solution ................................................................................................................................................ 477 How It Works ........................................................................................................................................ 478
13-5. Efficiently Building a Search Query......................................................................479
Problem ................................................................................................................................................ 479 Solution ................................................................................................................................................ 480 How It Works ........................................................................................................................................ 481
13-6. Making Change Tracking with POCO Faster.........................................................482
Problem ................................................................................................................................................ 482 Solution ................................................................................................................................................ 482 How It Works ........................................................................................................................................ 485
13-7. Compiling LINQ Queries........................................................................................485
Problem ................................................................................................................................................ 485 Solution ................................................................................................................................................ 485 How It Works ........................................................................................................................................ 488
13-8. Returning Partially Filled Entities .........................................................................489
Problem ................................................................................................................................................ 489 Solution ................................................................................................................................................ 489
CONTENTS
How It Works ........................................................................................................................................ 491
13-9. Moving an Expensive Property to Another Entity .................................................491
Problem ................................................................................................................................................ 491 Solution ................................................................................................................................................ 491 How It Works ........................................................................................................................................ 494
13-10. Avoiding Include.................................................................................................495
Problem ................................................................................................................................................ 495 Solution ................................................................................................................................................ 495 How It Works ........................................................................................................................................ 497
13-11. Improving QueryView Performance....................................................................497
Problem ................................................................................................................................................ 497 Solution ................................................................................................................................................ 497 How It Works ........................................................................................................................................ 499
13-12. Generating Proxies Explicitly..............................................................................500
Problem ................................................................................................................................................ 500 Solution ................................................................................................................................................ 500 How It Works ........................................................................................................................................ 502
13-13. Preventing the Update of All Columns in Self-Tracking Entities ........................503
Problem ................................................................................................................................................ 503 Solution ................................................................................................................................................ 503 How It Works ........................................................................................................................................ 507
14: Concurrency ....................................................................................509 14-1. Applying Optimistic Concurrency .........................................................................509
Problem ................................................................................................................................................ 509 Solution ................................................................................................................................................ 509 How It Works ........................................................................................................................................ 511
14-2. Managing Concurrency When Using Stored Procedures......................................512
Problem ................................................................................................................................................ 512
xxvi
CONTENTS
Solution ................................................................................................................................................ 512 How It Works ........................................................................................................................................ 516
14-3. Reading Uncommitted Data .................................................................................516
Problem ................................................................................................................................................ 516 Solution ................................................................................................................................................ 516 How It Works ........................................................................................................................................ 518
14-4. Implementing the Last Record Wins Strategy ..................................................518
Problem ................................................................................................................................................ 518 Solution ................................................................................................................................................ 518 How It Works ........................................................................................................................................ 520
14-5. Getting Affected Rows from a Stored Procedure .................................................520
Problem ................................................................................................................................................ 520 Solution ................................................................................................................................................ 521 How It Works ........................................................................................................................................ 524
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