Micro Project Practice (8): implementation of data access

In the previous article, we analyzed how data access was defined and how it was coupled with other (especially business) modules, and today we look at how data access (DataAccess) is implemented.

As you can see from the system structure diagram and the previous definition of data access, the task of the data access layer is to implement the ientitydataaccess and Idatabase interfaces. Because of the advent of LINQ, we need only one adapter to fit the Linq2sql class to Ientitydataaccess, whose class design diagram and file structure are as follows: