PPT introduced a simple three-tier presentation layer (UI): popular talk show to the user interface is that users in the use of a system when seen from him. 2, the business logic layer (BLL): According to the business logic for providing data to the presentation layer. 3, the data access layer (DAL): The transaction done directly with the database layer for the data to add, delete, modify, update, search, etc.

scjg.ppt

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