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Line 9: Also, business logic methods from an application can be mapped to the Data Access Layer. So, for example, instead of making a query into a database to fetch all users from several tables the application can call a single method from a DAL which abstracts those database calls. Data Access layer will make project database independent. [[Object-Relational Mapping]] tools provide data layers in this fashion, following the [[Active record pattern\|active record]] model.

Data access layer: Difference between revisions