By Vijay P. Mehta

This ebook goals to provide skilled .NET builders an intensive grounding in item Relational Mapping methodologies and express how LINQ can be utilized to accomplish them. It presents specific A-Z insurance of the foremost ideas and ideas in a transparent, effortless to keep on with, demeanour. The ebook is divided into elements. the 1st offers an in depth clarification of the most important strategies and applied sciences, whereas the second one brings them to lifestyles in an in depth fictional case examine utilizing an structure that may be simply tailored to quite a lot of reader’s circumstances.

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Directory 6-12 indicates an easy instance of utilizing a take part LINQ. during this instance, you're becoming a member of the worker and speak to entities at the identify characteristic. Granted, this isn't a situation that you'd ever most probably face in actual existence as the identify characteristic isn't specific sufficient for this organization to be useful, yet for the aim of demonstrating the syntax, it will get the purpose throughout. As you'll discover in directory 6-12, to exploit the subscribe to key-phrase, simply persist with the normal SQL trend of becoming a member of the 2 entities to one another through the use of a few characteristic because the tie. during this instance, you furthermore mght have an nameless variety that's back, containing the joined entities. directory 6-12 additionally exhibits the SQL that's generated from EF for this subscribe to question. There isn’t an excessive amount of to claim concerning the SQL since it is structurally normal to what you'll write whilst becoming a member of tables. Mehta_965-5C06. fm web page a hundred sixty five Monday, April 14, 2008 11:41 AM CH APT ER 6 ■ US ING TH E A DO . N ET E NT IT Y F RAME WO RK directory 6-12. LINQ sign up for question //C# instance var q = (from c in aw. touch subscribe to emp in aw. worker on c. identify equals emp. name into totEmpCont decide upon new { c, totEmpCont }). ToList(); -- SQL Generated from EF opt for [Project1]. [ContactID] AS [ContactID], [Project1]. [NameStyle] AS [NameStyle], [Project1]. [Title] AS [Title], [Project1]. [FirstName] AS [FirstName], [Project1]. [MiddleName] AS [MiddleName], [Project1]. [LastName] AS [LastName], [Project1]. [Suffix] AS [Suffix], [Project1]. [EmailAddress] AS [EmailAddress], [Project1]. [EmailPromotion] AS [EmailPromotion], [Project1]. [Phone] AS [Phone], [Project1]. [PasswordHash] AS [PasswordHash], [Project1]. [PasswordSalt] AS [PasswordSalt], [Project1]. [AdditionalContactInfo] AS [AdditionalContactInfo], [Project1]. [rowguid] AS [rowguid], [Project1]. [ModifiedDate] AS [ModifiedDate], [Project1]. [C1] AS [C1], [Project1]. [C2] AS [C2], [Project1]. [EmployeeID] AS [EmployeeID], [Project1]. [NationalIDNumber] AS [NationalIDNumber], [Project1]. [LoginID] AS [LoginID], [Project1]. [Title1] AS [Title1], [Project1]. [BirthDate] AS [BirthDate], [Project1]. [MaritalStatus] AS [MaritalStatus], [Project1]. [Gender] AS [Gender], [Project1]. [HireDate] AS [HireDate], [Project1]. [SalariedFlag] AS [SalariedFlag], [Project1]. [VacationHours] AS [VacationHours], [Project1]. [SickLeaveHours] AS [SickLeaveHours], [Project1]. [CurrentFlag] AS [CurrentFlag], [Project1]. [rowguid1] AS [rowguid1], a hundred sixty five Mehta_965-5C06. fm web page 166 Monday, April 14, 2008 11:41 AM 166 CH APT ER 6 ■ USI NG TH E A DO . NE T E NT IT Y F RAME WO RK [Project1]. [ModifiedDate1] AS [ModifiedDate1], [Project1]. [ContactID1] AS [ContactID1], [Project1]. [ManagerID] AS [ManagerID] FROM ( decide on [Extent1]. [ContactID] AS [ContactID], [Extent1]. [NameStyle] AS [NameStyle], [Extent1]. [Title] AS [Title], [Extent1]. [FirstName] AS [FirstName], [Extent1]. [MiddleName] AS [MiddleName], [Extent1]. [LastName] AS [LastName], [Extent1]. [Suffix] AS [Suffix], [Extent1]. [EmailAddress] AS [EmailAddress], [Extent1]. [EmailPromotion] AS [EmailPromotion], [Extent1].

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