Description: idle recent projects in the three tiers of it. Say something concrete things. I hated most space reasons. Online reason too many, and do not like the examples given. Most articles are more or less referred to the three-tier structure. Layer said, the business layer, data layer. Again business layer breakdown divided into exterior layer services, the main business services, library services and database layer. Today, business-to discuss it. For the most simple example. Client access to data.
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