Do schemaExport and/or schemaUpdate allow you to maintian your database data if they are being used after a field has been added to you class (that necessitates a new column in the table)? I have tried and my table keeps getting dropped.

For example, if I have a lot of data in a table, is it possible to use either of these tasks to Alter the table to add in the new column, or will they always be dropped and recreated?

Thanks, and thanks to those who have answered my previous questions, just getting to grips with it all at the moment.

David