By Julia Lerman, Rowan Miller
As well as Code First, EF 4.1 introduces easier EF coding styles with the DbContext, DbSet, ChangeTracker and Validation APIs. This moment mini-book will take the reader on a travel of those new positive factors and the way to use them. those new periods and APIs enable the person specialise in the commonest coding initiatives with Entity Framework and streamlines entry to styles that are often used, yet have been formerly non-intuitive and intricate to code. The Validation API that incorporates DbContext leverages the present .NET four IValidatableObject and ValidationAttributes in addition to offering extra validation good points. you are going to research the bits and bobs of having the main from server aspect validation from the DbContext.
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Extra info for Programming Entity Framework: DbContext
Therefore, deduction is performed abstractly at compile time. Executing the grammar generates all the constraints that need to be solved at run time. A very flexible control mechanism is therefore provided by the model in terms of the information fed back from the constraint solving procedure. It is shown that the model provides a general scheme for investigating an efficient computational model for implementing constraint logic programming systems. 1: Introduction In recent years, there has been a flurry of interest in constraint languages.
Though NCL is implemented in a purely sequential environment (extending sequential Prolog) it has some basic features to be implemented on a parallel architecture. Moreover the NCL networks can simulate parallel execution. Generally the functional behaviour of parallelism can be achieved in a sequential computational environment when two properties are present: decentralised control and independence 53 of the computation on the order of the input data for each processing element. While the first condition is an inherent property of NCL, the second one can be achieved by introducing two restrictions: • The use of activation-by-need scheme should be avoided.
An interesting approach is proposed by Jorrand in [Jorrand 87] and in some later works. Logic programs are represented as networks of communicating by unification agents working in parallel. 37 This approach preserves the original Herbrand semantics of Logic Programs without introducing any additional control means (used in the parallel Prolog implementations). This is a formal and elegant way of introducing a new computational paradigm - computation by communication. However this approach is difficult to implement and use in practice.
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