With repository design pattern, the previous diagram will change to the following diagram:. Also, now there are no queries or any other data access code written in the action methods of the Employee Controller. All these operations i. The Employee controller uses those methods to perform the required database operations. As we already discussed, nowadays, most data-driven applications need to access the data residing in one or more other data sources.
Most of the time data sources will be a database. Again, these data-driven applications need to have a good and secure strategy for data access to perform the CRUD operations against the underlying database. One of the most important aspects of this strategy is the separation between the actual database, queries, and other data access logic from the rest of the application. In our example, we need to separate the data access logic from the Employee Controller.
The Repository Design Pattern is one of the most popular design patterns to achieve such separation between the actual database, queries, and other data access logic from the rest of the application. As we already discussed that the Repository Design Pattern in C is used to create an abstraction layer between the data access layer and the business logic layer of the application.
That abstraction layer is generally called the Repository Layer and it will directly communicate with the data access layer, gets the data, and provides it to the business logic layer. The main advantage to use the repository design pattern is to isolate the data access logic and business logic. So that if we do any changes in any of this logic, then that should affect other logic.
So let us discuss the step-by-step procedure to implement the Repository Design Pattern in C. Please use the below SQL script to create and populate the Employee table with the required data that we are going to use in our application. Implement Authentication using ASP. Ali Rafique 3 Jun Reply. Waqas Anwar 4 Jun Reply. Zia Ul murtaza 30 May Reply.
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Sell Now. Login Connect with Google Or login with email. Forgot Password? Download Free Image. By Admin. All you have to write is Laptop and LaptopFactory. I think it is worth to add one more abstract product and bunch of end products which extends this one two sets of products.
Than it makes sens. Hi Pankaj. A question. Is this correct? This is no correct abstract factory implementation, here client knows about the concrete factories and just passing to consumer.
Abstract factory only should know the actual concrete factories to be used. Say you are writing application code independent of OS. Like Google Chrome Code. Similarly there will be another factory class for Linux OS to generate its buttons, menus.
Now application code instead of coding to any of these factory classes will code to its interface — AbstractFactoryClass for simplicity. I do not feel the If — else logic is actually irradicated. Sorry, to spoil the fun. When i first read it, I felt at last something that explains a difference between Factory and abstract factory.
The if-else logic is still present in the factory class. However, this seems to b worse. Actually the responsibility has shifted to client side. This was the reason why this code was moved to Factory to not let client worry about it.. Else why to go with so much of Fuzz just type in: if computerType. This is why I feel som many people are confused with Design patterns because everyone just explain the way they like it. In this example you are right. It seems redundant to use this pattern.
But I think there is a place for abstract factory pattern where your instantiations are very complicated, too complicated and ugly for a single factory and too complicated for the UI to comprehends.. Imagine there is a detail sophisticated info needed in order to make the correct server class object, and in this object you need to know exactly which parameters to tune and how to tune them. Also lets say this is a brand not a single class..
In the special factory for PC we will have them differentiate and get the exact PC to instantiate and also how to instantiate it. All of this will be too much for a single factory class. Can you please help me?? Are you sure this is correct?? It means client have access to class PCFactory.
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