data access layer - Class Diagram

Data access layer (DAL) is an important component of software development. It provides a bridge between applications and their data sources by providing an abstraction layer between the database and the application code. This abstraction layer enables developers to structure their applications in classes and objects, simplifying the development process. It also increases the flexibility of the code, as developers can switch out different database systems without having to rewrite existing code. Finally, the DAL helps ensure the integrity of data by validating the data and enforcing database rules before committing any changes to the data.

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