Unit of Work Pattern in the most effective way to implement Repository pattern. So to implement UnitOfWork Pattern we must have knowledge about the Repository patterns.
Let’s get some brief introduction about Repository Pattern:
A repository design pattern is basically the coding standard that separates the data access logic and maps it to the entities in the business logic. i.e. It introduces a middle layer to communicate with databases.
This type of implementation involves the use of one repository class for each entity. For example, if you have two entities Order and Student, each entity will have its own repository (OrderRepository.cs and StudentRepository.cs).
Suppose we have to do CRUD operations with order data and Student data
In that case, both repositories (OrderRepository.cs and StudentRepository.cs) will generate their own instances of the DbContext to do different operations. This may cause issues as each DbContext will have its own in-memory list of changes of the records that are being added/updated/modified, in a single transaction. So, In that case, if the Save method of one of the repositories fails and another one succeeds then it will result in database inconsistency. This is the case where we can use the UnitOfWork pattern.
So, we can add a UnitOfWork class/layer that will act as a centralized store for all the repositories to receive the instance of the DbContext.
How to implement?
To implement this:
- Create a new class called UnitOfWork. This will receive the instance of DbContext. This class will generate the required repository instances for Student and Order repositories. So these two repositories will use the same instance of DBContext.
- Now we changed the Student Repository to receive the instance of DbContext from the unit of work class.
- Similarly, we can create an Order repository class that will receive the DBContext for different operations/methods from the UnitOfWork class.
- Now we can access these classes and use their methods with common UnitOfWork class from the controller as below:
As shown in the above example we can create different repositories for different tables/Displays to do different operations and create a common UnitOfWork class to share the same instance of DBContext so as to make the database consistent.
So we can use the instance of UnitOfWork class in the controller and access any repository for which we want to do the changes.
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