Should I Use One DbContext Per Web Request in My Application?

DBCONTEXT instance: One web request one?

Design concept

To create an independent DBContext instance for each web request for each web application. Compared with the use of a single DBContext instance for the entire application, this method has many advantages. advantages

Acting Domain: Each web request is running in its own domain, so as to achieve a clear transaction boundary. This simplifies the error treatment, and ensures data integrity by limiting the impact of failure operation in the current request.

isolation:

Each web request has its own database context to prevent data conflict between concurrent requests. This is particularly important in multiple users or processes accessing the same database.
• Clear layered: By managing DBContext instances in the web request domain, business logic and underlying data access layer decoupling. This makes the code more modular and easier to maintain.
• Applicable scenes
• For each web request to use a single DBContext instance, it is applicable to the following application scenarios:
Data consistency is crucial, and it is necessary to limit the transaction in a single request.

The database's concurrency access volume is very high, and isolation is critical to prevent data conflict. The business logic is complicated, and clearly separates between data access and application logic.

The limitations of the instance of the transient DBContext

Although theoretically register DBContext as a transient (that is, each object is an instance), this may lead to the following problems:
• Change the loss:
Each object has its own DBConText instance, and must be preserved by

to be preserved. If this step is ignored, changes will be lost.

Entity scope: The entity loaded by a DBContext instance cannot be used in the context of another instance. This will complicate the code and cause performance problems.

Context ownership:

Display DBCONTEXT instances becomes more complicated, and it needs to be explicitly treated or automatically disposal at the request boundary.

• Conclusion context.SaveChanges()
The use of a single DBConText instance for each web request has obvious advantages in data consistency, isolation and code maintenance. After weighing the advantages and disadvantages, this method is strongly recommended for data integrity and concurrently.

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