Any JPA features for updating table metadata without loosing existing data?

Hi there,
I'm having a database with live data in it.
Now i have to change some tables (add columns, etc.). How can i do this without using drop-create-schema mechanics?
Do i really have to change my entity classes first, change schema creation to just create-schema so that only new tables are created automatically and finally have to put all the "alter table" stuff manually?
Is there any better solution?
Thanx in advance

no need, you can add columns using alter table command.
The table schema change will not affect your entities.
stop the application.
change the table columns.
start application having new entities.
let me know

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