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By Stefano Mostarda
SummaryEntity Framework four in motion is an example-rich educational for .NET builders with complete assurance of EF four beneficial properties. The e-book starts off with a assessment of the center principles at the back of the ORM version and exhibits via distinct examples and bigger case reviews how Entity Framework deals a soft transition from a standard ADO.NET procedure. in regards to the TechnologyEntity Framework builds at the ADO.NET patience version and the language positive factors of LINQ to create a robust patience mechanism that bridges the space among relational databases and object-oriented languages. in regards to the BookEntity Framework four in motion is an example-rich instructional that is helping .NET builders research and grasp the topic. It starts via explaining object/relational mapping after which indicates how one can simply transition to EF from ADO.NET. via quite a few targeted examples and higher case stories, the ebook unfolds the EF tale in a transparent, easy-to-follow sort. Infrastructure and internal workings of EF are mentioned for those who want them to appreciate a selected characteristic. Who may still learn ItThis e-book is written for .NET builders. wisdom of ADO.NET is beneficial yet no longer required. what is inside of complete assurance of EF four positive aspects Layer separation, information Layer, and area version top practices ========================================?======= desk of Contents half 1 REDEFINING YOUR DATA-ACCESS technique facts entry reloaded: Entity Framework Getting begun with Entity Framework half 2 GETTING began WITH ENTITY FRAMEWORK Querying the item version: the fundamentals Querying with LINQ to Entities area version mapping figuring out the entity lifecycle Persisting items into the database dealing with concurrency and transactions half three learning ENTITY FRAMEWORK an alternate manner of querying: Entity SQL operating with saved strategies operating with services and perspectives Exploring EDM metadata Customizing code and the clothier
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There’s no point in creating an OrderDetail class and giving it an OrderId property. The best solution is to take advantage of a peculiar feature of classes: they can have properties whose type Download from Wow! com> 14 CHAPTER 1 Data access reloaded: Entity Framework is a user-defined class. This means the Order class can hold a reference to a list of OrderDetail objects, and the OrderDetail class can have a reference to Order. When you create these relationships, you’re beginning to create an object model.
In a database, the relationship between an order and its detail lines is described using a foreign key constraint between the OrderId column in the Order table and the OrderId column in the OrderDetail table. From a database design point of view, this is the correct approach. In the object-oriented world, you have to follow another path. There’s no point in creating an OrderDetail class and giving it an OrderId property. The best solution is to take advantage of a peculiar feature of classes: they can have properties whose type Download from Wow!
Using classes is a natural choice for most applications today. Classes are the foundation of object-oriented programming. They easily represent data, perform actions, Download from Wow! com> Using classes to organize data 11 publish events, and so on. From a data organization point of view, classes express data through methods and properties (which, in the end, are special methods). By using classes, you can choose your internal representation of data without worrying about how it’s persisted—you need to know nothing about the storage mechanism.