使用Delphi在已安装的应用程序中进行数据库版本控制

I'm working on a number of Delphi applications that will need to upgrade their own database structures in the field when new versions are released and when users choose to install additional modules. The applications are using a variety of embedded databases (DBISAM and Jet currently, but this may change).I'm working on a number of Delphi applications