The ActiveRecord class defines a static $table variable, which is subsequently overridden by the Customer and Sales subclasses to specify the SQL table names custdb and salesdb.
ActiveRecord类定义一个静态的 $table变量，它会相继被Customer和Sales子类覆盖来指定SQL表名 custdb 和salesdb。
They are most effective when you keep your include file names static rather than variable-driven, so it's important to try to do this whenever possible.
当您将include文件名保留为静态而非变量驱动的时，它们最有效，因此尽可能尝试这样做很有用。
They are most effective when you keep your include file names static rather than variable-driven, so it's important to try to do this whenever possible.
当您将include文件名保留为静态而非变量驱动的时，它们最有效，因此尽可能尝试这样做很有用。
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