This is where all business rules are applied as data passes from the Presentation Layer (UI), through the business Layer to the data Access Layer, and back again.
当数据从表示层(ui)传递过来的时候，全部的业务规则都在这里执行，通过业务层到数据访问层，然后再倒过来。
This is where all business rules are applied as data passes from the Presentation Layer (UI), through the business Layer to the data Access Layer, and back again.
当数据从表示层(ui)传递过来的时候，全部的业务规则都在这里执行，通过业务层到数据访问层，然后再倒过来。
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