Add column in a table mapped using hibernate, without losing existing data

Question

I have a table called Person which I have already mapped in hibernate I has already some data which I do not want to loose. I need to add new column called address, Any idea how to do that in hibernate ?

Thanks in Advance..

Answer 1

If you current tables are generated by Hibernate , you can simply add the address property in the java entity class for the address column . Then set the hibernate.hbm2ddl.auto property to update and hibernate will automatically create this column when the SessionFactory is built next time . Hibernate will not change any data store in your database when hibernate.hbm2ddl.auto is update.

Or , you can manually issue the SQL to alter the table structure and then add the address property in the java entity class for the address column.