tietokantakerrokset

Tietokantakerrokset refers to the layered architecture commonly used in software development, particularly when interacting with databases. This approach divides the application into distinct layers, each with specific responsibilities. The primary goal is to separate concerns, making the codebase more organized, maintainable, and scalable.

The most common layering includes a presentation layer, a business logic layer, and a data access layer. The presentation layer, also known as the user interface (UI), is what the user interacts with. It handles displaying information and capturing user input. This layer does not directly access the database.

Below the presentation layer is the business logic layer. This layer contains the core functionality and rules of the application. It processes user requests, performs calculations, and orchestrates operations. When data is needed or needs to be stored, the business logic layer communicates with the layer below it.

The lowest layer is the data access layer (DAL). This layer is responsible for all database operations. It handles tasks such as connecting to the database, executing queries (like SELECT, INSERT, UPDATE, DELETE), and managing data persistence. The DAL abstracts the complexities of the underlying database technology, meaning the business logic layer doesn't need to know the specific SQL syntax or database system being used.

By employing tietokantakerrokset, developers can make changes to one layer without significantly impacting others. For example, the UI can be redesigned without altering the business logic or database interactions, or the database can be switched to a different vendor by only modifying the data access layer. This modularity improves development efficiency and reduces the risk of introducing errors.