Entity Framework Core Cookbook by Ricardo Peres

By Ricardo Peres

Leverage the total power of Entity Framework with this choice of strong and easy-to-follow recipes Entity Framework is a hugely steered item Relation Mapping device used to construct advanced platforms. to be able to live on during this growing to be marketplace, the information of a framework that is helping supply easy accessibility to databases, that's, Entity Framework has turn into a need. This ebook will supply .NET builders with this data and consultant them via operating successfully with facts utilizing Entity Framework middle. you are going to start up through studying tips on how to successfully use Entity Framework in useful occasions. you'll achieve a deep knowing of mapping houses and tips to deal with validation in Entity Framework. The e-book will then clarify find out how to paintings with transactions and kept techniques besides bettering Entity Framework utilizing question libraries. relocating on, you are going to discover ways to enhance complicated question situations and enforce transaction and concurrency keep an eye on. you are going to then learn to enhance and advance Entity Framework in advanced company eventualities. With the concluding bankruptcy on functionality and scalability, this booklet gets you prepared to take advantage of Entity Framework proficiently.

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Mapping Entities In this chapter, we will cover the following topics: • • • • • • • • • • Mapping non-public members Mapping interfaces Shadow properties Creating one-to-one maps Creating one-to-many maps Creating many-to-many maps Creating custom conventions Using sequence key generators Using GUIDs as keys Implementing inheritance–Table per class Hierarchy Introduction Object-relational mappers such as Entity Framework rely on mappings to translate Object-oriented concepts—classes, properties, references, inheritance – to the database world – composed of tables and columns – and vice versa.

Basically, this pattern states that we keep track of all entities that are affected by a business transaction and send them all at once to the database, sorting out the ordering of the changes to apply—inserts before updates, and so on. EntityFrameworkCore. SqlServer. To mock interfaces and base classes, we will use Moq. Finally, xunit is the package we will be using for the unit tests and dotnet-text-xunit adds tooling support for Visual Studio. Tools is set as a tool. Open Using EF Core Solution from the included source code examples.

Linq; namespace DataAccess { public interface IBlogRepository : IRepository { } } 8. Refresh(); throw; } } } } 9. First(); return View(blog); } } } 10. GetService())); } How it works… The tests set up the scenarios in which we would want to use a unit of work pattern: reading, updating, rolling back, and committing. The key to this is that these are all separate actions, not dependent on anything before or after them. If the application is web-based, this gives you a powerful tool to tie to the HTTP request so any unfinished work is cleaned up, or to ensure that you do not need to call SaveChanges, since it can happen automatically.

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