一个将会为这个数据库和应用软件提供通信的datasource类。
A DataSource class that provides the communication between the database and the application.
结构图，比如类图，代表静态应用软件的构架。
Structure diagrams, such as a class diagram, represent static application structure.
这些在您的应用软件中可利用的类归纳在图1所示的图中。
The classes available to your application are structured as Figure 1 shows.
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