How to configure Entity Framework 4 to prevent drop when generate database

is there any option when updating classes in EF4 Modeller to disable 开发者_StackOverflowthe drop of all data and tables, just to append non existing fields and leave old tables and data untouched.

I mean not to change every time on every little change to edit manual the SQL files.

Thanks.

I think you can do it with the "Entity Designer Database Generation Power Pack." You can read about this tool here.