A large enterprise application will typically have one or more databases to store data and on top of this a data access layer (DAL) to access the database(s). On top of this there may be some repositories to communicate with the DAL, a business layer containing logic and classes representing the business domain, a service layer to expose the business layer to clients and finally some user interface application such as an ASP.NET web application or a WPF desktop application.
| CROSS CUTTING SECURITY LOGGING EXCEPTION BUSINESS TEMPLATE |
User interface layer MVC / ANGULAR / ASP.NET / WPF / Console App / WinRT / … |
| Service layer WebAPI / WCF / ASMX / … | |
| Business logic layer | |
| Data access layer EF / ADO.NET / … | |
| Database SQL Server / Oracle / MySql / … |
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