Mastering Entity Framework

Effortlessly produce data-driven functions for .NET to deal with the competing calls for of knowledge garage and information modeling with Entity Framework

About This Book

  • Understand every little thing that calls for to successfully commence constructing and dealing with facts pushed functions utilizing Entity Framework.
  • Implement an example-based method of comprehend numerous techniques linked to Entity Framework
  • Save time, research swifter, and assemble wisdom that may supply complex content material on constructing and handling data-driven purposes utilizing the Entity FrameworkData entry is a vital part of any software program program. Entity Framework presents a finished, model-based method that makes the information entry easy for builders by means of liberating you from writing related information entry code for all of the area models

Who This publication Is For

This booklet is for .NET builders who're constructing data-driven functions utilizing ADO.NET or different information entry applied sciences. This ebook goes to provide you every little thing you want to successfully increase and deal with data-driven functions utilizing Entity Framework.

What you are going to Learn

  • Find out the advantages of utilizing Entity Framework over undeniable ADO.NET
  • Discover quite a few techniques of utilizing Entity Framework resembling Database First, version First, and Code First, and in addition find out how to select the simplest strategy for a given scenario
  • Explore the right way to deal with Entity relationships, enforce Entity inheritance, and practice version validations
  • Understand easy methods to use saved tactics and features utilizing Entity Framework
  • Familiarize your self with area modeling utilizing Entity Framework
  • Become knowledgeable in coping with database production and seeding dummy info in a database
  • Understand LINQ to Entities and Entity SQL to question information utilizing Entity Framework
  • Manage concurrency and transactions utilizing Entity Framework

In Detail

Data entry is a vital part of any software program software. Entity Framework presents a model-based approach that makes facts entry easy for builders through releasing you from writing comparable facts entry code for all your area models.

Mastering Entity Framework will give you more than a few techniques while constructing a data-oriented software. you will get began through handling the database relationships as Entity relationships and practice area modeling utilizing Entity Framework. you are going to then discover how one can reuse info entry layer code corresponding to kept techniques and table-valued capabilities, and practice a number of usual actions akin to validations and mistake dealing with. you are going to how to retrieve facts by way of querying the Entity information version and know the way to take advantage of LINQ to Entities and Entity SQL to question the Entity facts Model.

Show description

Quick preview of Mastering Entity Framework PDF

Similar Education books

McGraw-Hill Education Mathematical Reasoning Workbook for the GED Test

Get the particular perform you must triumph over the GED attempt in Mathematical Reasoning to accomplish your top rating at the GED attempt, you need to excel at the Mathematical Reasoning part. The most effective option to be successful is with in depth perform in each math subject tested--and that is what you will get in McGraw-Hill schooling: Mathematical Reasoning Workbook for the GED try.

Children of the Land: Adversity and Success in Rural America (The John D. and Catherine T. MacArthur Foundation Series on Mental Health and De)

A century in the past, such a lot americans had ties to the land. Now just one in fifty is engaged in farming and little greater than a fourth stay in rural groups. notwithstanding now not new, this exodus from the land represents one of many nice social hobbies of our age and can also be symptomatic of an extraordinary transformation of our society.

On Democracy: Second Edition

Written by way of the preeminent democratic theorist of our time, this ebook explains the character, price, and mechanics of democracy. This new edition includes extra chapters via Ian Shapiro, Dahl’s successor as Sterling Professor of Political technology at Yale and a number one modern authority on democracy.

Beyond the University: Why Liberal Education Matters

An eloquent security of liberal schooling, obvious opposed to the backdrop of its contested heritage in the USA Contentious debates over the benefits—or drawbacks—of a liberal schooling are as outdated as the United States itself. From Benjamin Franklin to the web pundits, critics of upper schooling have attacked its irrelevance and elitism—often calling for extra vocational guideline.

Additional info for Mastering Entity Framework

Show sample text content

Get involved with us at for extra information. At www. PacktPub. com, it's also possible to learn a suite of unfastened technical articles, join more than a few unfastened newsletters and obtain particular mark downs and gives on Packt books and eBooks. https://www2. packtpub. com/books/subscription/packtlib do you want quick options on your IT questions? PacktLib is Packt's on-line electronic booklet library. right here, you could seek, entry, and skim Packt's complete library of books. Why subscribe? absolutely searchable throughout each e-book released via PacktCopy and paste, print, and bookmark contentOn call for and obtainable through an internet browser loose entry for Packt account holders when you've got an account with Packt at www.

Extent2]. [EmployerName] AS [EmployerName] FROM .. [dbo]. [Employees] AS [Extent1] internal subscribe to .. [dbo]. [Employers] AS [Extent2] ON [Extent1]. [EmployerId] = [Extent2]. [ID] the place .. ([Extent1]. [ID] = @p__linq__0) AND (@p__linq__0 isn't NULL) Tip to determine the SQL question generated via Entity Framework, we will use a ToString() question on a DbQuery item. regrettably, this may purely be performed if we use the question syntax to retrieve the knowledge. to examine the generated SQL for the previous code, we first have to write the identical question syntax for this after which practice ToString() on that: var _employer = from c in db.

So, let's have a look at how we will be able to regulate the generated conceptual version to enforce the inheritance dating, and Entity Framework will look after updating the knowledge within the respective tables. Deleting default relationships the very first thing we have to do to create the inheritance courting is to delete the prevailing courting from the Entity version. this is performed via right-clicking at the dating and choosing Delete from version as follows: Deleting an present courting from the Entity version including inheritance relationships among entities as soon as the relationships are deleted, we will upload the hot inheritance relationships in our Entity version as follows: including inheritance relationships within the Entity version after we upload an inheritance courting, the visible Entity dressmaker will ask for the bottom type and derived classification as follows: settling on the bottom classification and derived classification engaging within the inheritance dating as soon as the inheritance courting is created, the Entity version will appear like this: Inheritance courting within the Entity version Tip After growing the inheritance courting, we are going to get a assemble errors that the identity estate is outlined in the entire entities.

ModelBuilder. Entity() . HasMany(e => e. Blogs) . WithRequired(e => e. consumer) . HasForeignKey(e => e. AuthorId) . WillCascadeOnDelete(false); // One to many courting among consumer and remark. modelBuilder. Entity() . HasMany(e => e. reviews) . WithOptional(e => e. consumer) . HasForeignKey(e => e. PosterId); // Many to many courting among person and position. modelBuilder. Entity() . HasMany(e => e. Roles) . WithMany(e => e. clients) . Map(m => m. ToTable("UserRoles") . MapLeftKey("UserId") . MapRightKey("RoleId")); } } within the previous code, we created our DbContext type, BlogAppContext.

The previous LINQ question will go back an inventory of staff. let us take a look at the SQL generated via this LINQ question: pick out [Extent1]. [ID] AS [ID], [Extent1]. [EmployeeName] AS [EmployeeName], [Extent1]. [Employer_ID] AS [Employer_ID] FROM [dbo]. [Employees] AS [Extent1] From the previous question, it may be obvious that Entity Framework translated our LINQ question and fetched the entire info from the workers desk. Tip LINQPad is a superb software to perform LINQ to Entities. It has the choice of utilizing Entity Framework's DbContext or ObjectContext item, and we could us use LINQ to Entities to question the database.

Download PDF sample

Rated 4.55 of 5 – based on 23 votes