Programming Entity Framework - Cdn.oreilly.com

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EntityConnection and the Connection String 70 EntityCommand 71 ExecuteReader 71 Forward-Only Access to the Fields 71 Translation to Database Queries 72 Pay Attention to the .NET Method’s Impact on Generated SQL 73 Avoid Inadvertent Query Execution 74 Summary 75 4. Exploring EDM Queries in Greater Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Same Model, Friendlier Name 78 Projections in Queries 79 Projections in LINQ to Entities 80 LINQ Projections and New Language Features 80 Projections with LINQ Query Methods 84 Projections in Entity SQL 84 DbDataRecords and Nonscalar Properties 86 Projecting with Query Builder Methods 87 Querying Across Associations 87 Navigation to an EntityReference 88 Filtering and Sorting with an EntityReference 90 Navigating to Entity Collections 91 Projecting Properties from EntityCollection Entities 92 Filtering and Sorting with EntityCollections 93 Aggregates with EntityCollections 94 Entity SQL SET Operators 96 Aggregates in LINQ Methods and Query Builder Methods 96 Joins and Nested Queries 97 Joins 97 Nested Queries 99 Grouping 101 Naming Properties When Grouping 103 Chaining Aggregates 103 Filtering on Group Conditions 104 Grouping in Entity SQL 105 Shaped Data Returned by Queries 107 Shaped Data from Entity SQL 109 Deferred Loading and Eager Loading Queries 111 Deferred Loading Entity Collections with Load 111 Using the Include Method to Eager-Load 113 Using Include with an ObjectQuery 115 Pros and Cons of Load and Include 116 Retrieving a Single Entity 117 Table of Contents | vii
Retrieving a Single Entity with GetObjectByKey 118 Entity SQL’s Wrapped and Unwrapped Results 118 Entity SQL Rules for Wrapped and Unwrapped Results 121 Digging a Little Deeper into EntityClient’s Results 121 Summary 122 5. Modifying Entities and Saving Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 How ObjectContext Manages Entities 123 Remembering Original Values and Keeping Track of Changes 124 The SaveChanges Method 124 From Entity Framework Command to Native Command 127 Adding New Entities 127 Breaking Down the Native Insert Command 128 Inserting New Parents and Children 129 Deleting Entities 131 Summary 132 6. Using Stored Procedures with the EDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Adding the Stored Procedures into the Model 133 Working with Functions 135 Function Attributes 136 Implementing Functions 138 Rules for Mapping Functions to Entities 139 Wiring Up Insert, Update, and Delete Functions to an Entity 139 Inspecting the Mappings in the XML 141 Using These Mapped Functions 143 The EDM Designer’s Model Browser 144 Mapping the Last of the Four Functions: CustomersbyState 145 Using the CustomersbyState Function 146 Using Functions in a Query 147 More About the Update Model Wizard 148 A Frequently Asked Question About Deleting Entities from the Model 148 Summary 149 7. Tuning Up a Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 The BreakAway Geek Adventures Business Model 151 Creating a Class Library Project to Host an EDM 152 Inspecting and Cleaning Up a New Model 153 Modifying the Names of Entities 154 Collisions Between Property Names and Entity Names 155 Cleaning Up Navigation Property Names 156 Entities with Multiple Relationships to a Single Entity 157 viii | Table of Contents
Page 1 and 2: Free Sampler
Page 3 and 4: Programming Entity Framework by Jul
Page 5: The EDM Within the Entity Framework
Page 9 and 10: Breaking Apart the ObjectQuery 222
Page 11 and 12: Using a New EntityDataSource to Add
Page 13 and 14: Insert, Update, and Delete Function
Page 15 and 16: Digging Through ObjectStateEntry 53
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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