[Dnn module development] dnn module hierarchy

Yes Dnn Module Hierarchy Diagram (captured on a video; downloaded video)

View from the graphDnnThe module is also developed based on a three-tier structure model:
APPICATION Layer: ApplicationProgramLayer (UI Layer)
Include user interfaceUI,Info Object:Custom Business Object (Custom Business Object,CBO)

Bll Layer: Business logic layer
IncludeBusiness Logic Access ObjectController object; Data Access Factory:Data Provider

Dal Layer: Data access layer
Contains various types of Database AccessProvider, SuchSqldataprovider

Relationship between layers:Store DataIn the custom business object,UIControls get transmitted data through custom business objects. The business logic Access Object operates the database and fills in custom business objects through the specific data access objects instantiated by the Data Access factory.

Related content:
About module File structure: http://www.cnblogs.com/esshs/archive/2005/07/21/197198.html

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