Programming Entity Framework - Cdn.oreilly.com

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Attach Versus Add 475 Moving an Entity to a New Graph 475 Learning a Few Last Tricks to Make You a Relationship Pro 476 Using CreateSourceQuery to Enhance Deferred Loading 476 Getting a Foreign Key Value 478 Summary 479 16. Making It Real: Connections, Transactions, Performance, and More . . . . . . . . . . . 481 EntityConnection and Database Connections in the Entity Framework 481 EntityConnection Versus Database Connection 482 Programming EntityConnection Strings 483 Using the EntityConnectionStringBuilder Class 484 Opening and Closing Entity and Database Connections 486 Taking Control of How Store Connections Are Disposed 488 What About Connection Pooling? 490 The Entity Framework and Transactions 490 Why Use Your Own Transaction? 490 Understanding the Entity Framework’s Default: Implicit Transactions 491 Specifying Your Own Transaction 493 Reading Queries Using System.Transaction or EntityTransaction 496 Can You Use Transactions Within ObjectContext? 497 The Entity Framework and Security 497 SQL Injection 498 Protecting Data from Connection Piggybacks 500 The Entity Framework and Performance 501 A Few “Backyard Benchmarks” 501 Reducing the Cost of Query Compilation 507 The EDM Generator for Precompiled Views (and More) 508 Precompiled LINQ to Entities Queries 510 Query Plan Caching for Entity SQL 513 What About Database Updates and Performance? 515 Entities in Multithreaded Applications 516 Forcing an ObjectContext to Use Its Own Thread 517 Another Spin on Threading: Concurrent Processing 520 Summary 523 17. Controlling Objects with ObjectStateManager and MetadataWorkspace . . . . . . . 525 Managing ObjectStateEntry Objects with ObjectStateManager 526 An ObjectStateEntry Refresher 526 Getting an ObjectStateManager and Its Entries 527 Getting Groups of Entries with GetObjectStateEntries 527 Getting a Single Entry with GetObjectStateEntry and TryGetObject- StateEntry 531 Table of Contents | xv
Digging Through ObjectStateEntry 532 CurrentValues and OriginalValues 532 CurrentValueRecord.DataRecordInfo 534 Building the ObjectStateEntry Visualizer 535 Setting Up the Project and Code File 536 Retrieving an ObjectStateEntry Using an EntityKey 537 Reading the OriginalValues and CurrentValues of an ObjectStateEntry 538 Determining Whether a Property Has Been Modified 539 Displaying the ObjectStateEntry’s State and Entity Type 540 Getting ComplexType Properties Out of ObjectStateEntry 541 Modifying Values with ObjectStateManager 543 Working with Relationships in ObjectStateManager 544 ObjectStateManager and SavingChanges 549 The FieldMetadata Hierarchy 551 The MetadataWorkspace API 552 Loading the MetadataWorkspace 552 Clearing the MetadataWorkspace from Memory 554 The MetadataWorkspace ItemCollections 554 ItemCollections Are Loaded as Needed with EntityCollection 555 Reading Metadata from the MetadataWorkspace 556 Querying the Items 559 Building Entity SQL Queries Dynamically Using Metadata 559 Reading the Results of a Dynamically Created Query 563 Dynamic Entity SQL and Generics for Reference Lists 567 Creating EntityObjects Without Entity Classes 569 Creating a New Entity with CreateInstance 570 Using System.Type to Inspect the EntityType 571 Creating Entities and Graphs Dynamically 571 Calling the AddChildtoParentObject Method 574 Summary 575 18. Handling Entity Framework Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 577 Preparing for Exceptions in Entity Framework Code 578 EntityConnectionString Exceptions 580 Connection String Can’t Be Found or Is Improperly Configured: System.ArgumentException 580 Metadata Files Cannot Be Found: System.Data.MetadataException 580 Handling Connection String Exceptions 581 Query Compilation Exceptions 582 Invalid LINQ to Entities Query Expressions: System.NotSupportedException 582 Invalid Entity SQL Query Expressions: EntitySQLException 582 Store Provider Issues: EntityCommandCompilationException 584 xvi | Table of Contents
Page 1 and 2: Free Sampler
Page 3 and 4: Programming Entity Framework by Jul
Page 5 and 6: The EDM Within the Entity Framework
Page 7 and 8: Retrieving a Single Entity with Get
Page 9 and 10: Breaking Apart the ObjectQuery 222
Page 11 and 12: Using a New EntityDataSource to Add
Page 13: Insert, Update, and Delete Function
Page 17 and 18: 19. Using Your Own Custom Classes .
Page 19 and 20: Designing the Service Interface 725
Page 21 and 22: In addition to POCO support, the te
Page 23 and 24: using System.Text; namespace Chapte
Page 25 and 26: } } public ObjectSet Addresses { ge
Page 27 and 28: } If you run the code now, you will
Page 29 and 30: Using Proxies to Enable Change Noti
Page 31 and 32: Figure 13-2. A high-level view of t
Page 33 and 34: Rule 2: To enable lazy loading on a
Page 35 and 36: using System.Collections.ObjectMode
Page 37 and 38: Modifying the POCO Template Althoug
Page 39 and 40: The next step is to modify the temp
Page 41 and 42: get; set; } public string Street1 {
Page 43: Want to read more? You can find thi

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