Julia Lerman's Programming Entity Framework: DbContext: Querying, Changing, PDF

By Julia Lerman

ISBN-10: 1449312969

ISBN-13: 9781449312961

The DbContext API captures Entity Framework's (EF) most ordinarily used positive factors and projects, simplifying improvement with EF. This concise booklet exhibits you the way to take advantage of the API to accomplish set operations with the DbSet type, deal with swap monitoring and get to the bottom of concurrency conflicts with the switch Tracker API, and validate adjustments in your information with the Validation API. With DbContext, you possibly can question and replace information, no matter if you are operating with person gadgets or graphs of items and their comparable facts. you will discover a variety of C# code samples that will help you start. All you wish is event with visible Studio and database administration fundamentals.

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Additional resources for Programming Entity Framework: DbContext: Querying, Changing, and Validating Your Data with Entity Framework

Sample text

Fortunately you don’t need to know SQL, because Entity Framework will take care of translating LINQ queries into SQL for you. Getting all the data from a set doesn’t require you to really write a query. You can simply iterate over the contents of any given DbSet and Entity Framework will send a query to the database to find all the data in that set. Let’s add a PrintAllDestinations method to our console application that iterates over the Destinations set defined in our Break AwayContext and prints out the name of each Destination (Example 2-4).

Name); So far our queries have returned collections of entities from our model, but this may not always be the case. In fact, we have been returning complete Destination objects when we really only need the name. You can use projection to create a query that selects from a set of entities in your model but returns results that are of a different type. For example, you can use projection to create a query that selects from a set of entities type but only returns a subset of the properties of that entity.

To perform data access using these classes you will be using the BreakA wayContext from the DataAccess project. The project contains additional classes that are represented in BreakAwayContext as well as the Lodgings and Destinations. We’ll be using Code First for the examples in this book, but the techniques you will learn apply to any context that derives from DbContext. This includes contexts created using the Model First or Database First workflows. Example 2-3. BreakAwayContext class as listed in download solution public class BreakAwayContext : DbContext { public DbSet Destinations { get; set; } public DbSet Lodgings { get; set; } public DbSet Trips { get; set; } public DbSet People { get; set; } public DbSet Reservations { get; set; } public DbSet Payments { get; set; } public DbSet Activities { get; set; } } Querying All the Data from a Set Arguably the simplest query you can write is one that fetches all the data for a given entity type.

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Programming Entity Framework: DbContext: Querying, Changing, and Validating Your Data with Entity Framework by Julia Lerman


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