By Vijay P. Mehta
It is almost most unlikely at the present time to put in writing company software program with no using a number of relational databases. Granted, there are instances whilst the knowledge is brief and never saved in a database, yet for the main half, software program must eat and manage facts in a database. It sounds effortless, yet there are thousands of how to attach software program structures to databases and hundreds of thousands of people that imagine they've got the skeleton key for facts entry layers. Pro LINQ item Relational Mapping in C# 2008 explains an effective, repeatable strategy to observe layout styles to construct scalable object–oriented information entry layers.
Object relational mapping (OR/M) has been a grey zone in Microsoft improvement for a few years. It’s no longer that Microsoft language builders don’t comprehend OR/M; actually, the other is correct, as is exemplified via the glut of third–party .NET OR/M instruments out there. The fight has come extra from the shortcoming of local instruments with the object–oriented and item patience means to successfully paintings during this area. With the inception of .NET, Microsoft overcame the 1st challenge through constructing an object–oriented atmosphere and framework. the second one quandary, the local item endurance layer, is barely now being discovered with the advent of Language built-in question (LINQ) and LINQ’s young children, the Language built-in question for Relational Databases (LINQ to SQL) and the Language built-in question for the ADO.NET Entity Framework (LINQ to Entities). the grey zone now not exists, and the .NET builders of the area eventually have the local instruments required to construct modular, reusable facts entry layers.
<h3>What you’ll learn</h3> * The robust merits that OR/M can carry on your code
* The local instruments which are now on hand inside of visible Studio 2008 for OR/M
* tips to construct scalable object–oriented facts entry layers that reap the benefits of OR/M’s flexibility
* How LINQ matches into this photograph, including the benefits and downsides that it might probably deliver
* How the strategies paintings within the actual global by means of interpreting a completely labored and targeted case examine, created with an structure than will be simply utilized to quite a lot of different situations
<h3>Who is that this publication for?</h3>
This ebook is meant for Microsoft .NET builders who're utilizing or comparing Microsoft visible Studio 2008 to construct data–aware functions, and it'll supply styles and assets that may be used to construct firm classification software.
<h3>About the Apress seasoned Series</h3>
The Apress seasoned sequence books are sensible, expert tutorials to maintain you on and relocating up the pro ladder.
You have got the task, now you want to hone your abilities in those difficult aggressive instances. The Apress seasoned sequence expands your talents and services in just the components you wish. grasp the content material of a professional e-book, and you'll continuously be capable to get the activity performed in a qualified improvement undertaking. Written by means of specialists of their box, professional sequence books from Apress provide the hard–won recommendations to difficulties you'll face on your specialist programming career.
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Sample text
For all intents and purposes, value objects are the parasites of your model because there is no reason for their existence except to describe and associate themselves with your entities. For example, to continue with the automobile referenced in the preceding “Entities” section, your automobile has attributes including color, tint, and stereo type. Each of these items cannot exist by itself in the system—that is, each of these attributes lacks identity. Thus, a value object is typically an immutable object with no identity, containing values used to describe entities.
At the heart of the factory pattern is encapsulation. As I mentioned in the “Aggregates” section earlier in this chapter, it is always a best practice to limit creation of objects in your domain. The factory pattern provides a standard technique for controlling the creation of objects and aggregates in your domain model. By using this technique in your domain model, you can decouple the creation of objects, thereby increasing flexibility and reusability. In addition, by using encapsulation, you can enforce any constraints in your aggregates and reduce the risk of corruption.
DSL tools provide you with the ability to create a custom modeling language and designer to manipulate that language. Specialization is becoming an important aspect of every facet of information technology. It makes sense that the next logical step would be customized languages for your domain. This is pretty close to what is seen in modern enterprise workflow systems with their UI designer. These workflow systems provide a series of widgets that you can customize for your specific domain. You can in turn use these custom widgets to expand upon and ultimately build your process and system.