Read e-book online Ruminations on C++: A decade of programming insight and PDF

By Andrew Koenig

Ruminations on C++ concentrates at the key C++ rules and programming strategies - skimming the cream - to allow you to comprehend the "why" and never simply the "how" of C++ programming. you needn't be knowledgeable C++ programmer to discover sturdy fodder the following, but even specialists don't need to worry overgrazing: you can find anything worthy chewing on in each bankruptcy. this could be your subsequent C++ publication, since it covers a vast diversity of C++ rules and strategies, from particular code examples to layout rules and philosophy; exhibits easy methods to take into consideration programming in C++, not only tips on how to stick with ideas; explains the inducement at the back of its examples, occasionally even fixing an identical challenge in alternative ways; covers either object-oriented programming and established programming; and explains the guidelines in the back of the normal Template Library, that is an important contemporary innovation in C++. This publication involves you from those that all started utilizing C++ while its complete person neighborhood may possibly nonetheless slot in one room. either one of them have contributed considerably to the evolution of C++.

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Read Online or Download Ruminations on C++: A decade of programming insight and experience PDF

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Reload()); } } } 3. Linq; namespace DataAccess { 22 Chapter 1 public interface IDbContext { DbChangeTracker ChangeTracker { get; } DbSet Set() where T : class; IQueryable Find() where T : class; DbEntityEntry Entry(T entity) where T : class; int SaveChanges(); void Rollback(); } } 4. In the DataAccess project, create a new C# interface called IUnitOfWork with the following code: using System; namespace DataAccess { public interface IUnitOfWork { void RegisterNew(T entity) where T : class; void RegisterUnchanged(T entity) where T : class; void RegisterChanged(T entity) where T : class; void RegisterDeleted(T entity) where T : class; void Refresh(); void Commit(); IDbContext Context { get; set; } } } 5.

Converting an object to a record in a table or multiple tables requires separating the data from the object and flattening it out. This process has been accomplished by many Object Relational Mappers (ORMs) through a variety of different approaches. Entity Framework approaches the problem of objects that differ greatly from the relational tables by allowing you to configure the mapping manually where it differs from the standard convention. This will reduce the amount of code that you have to write for the configuration, but it will require the learning of a new and fluent Application Programming Interface (API), which shows the database layer how to translate the code into SQL statements.

We will need to add a connection setting to the Test project to our database, and make sure that the database name is populated (the database name needs to be typed as it does not exist yet): 3. OnModelCreating(modelBuilder); } public DbSet Blogs { get; set; } } } 4. SaveChanges(); } } } 35 Improving Entity Framework in the Real World How it works... On the construction of the context, Entity Framework creates an in-memory version of the expected database model and then tries to connect to that database.

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