Hibernate - hbm2ddl.auto

You may remember this parameter in hibernate.cfg.xml

  
  create-drop

This option is only for developers and not recommend for production at any time.

It has four possible values:

• validate - makes no changes to the database
• update - update the database
• create - destroy previous data, and create new schema every time
• create-drop - the database scheme will be destroyed when SessionFactory is closed explicitly.

Code in org.hibernate.cfg.SettingFactory

  String autoSchemaExport = properties.getProperty( AvailableSettings.HBM2DDL_AUTO );
  if ( "validate".equals(autoSchemaExport) ) {
   settings.setAutoValidateSchema( true );
  }
  if ( "update".equals(autoSchemaExport) ) {
   settings.setAutoUpdateSchema( true );
  }
  if ( "create".equals(autoSchemaExport) ) {
   settings.setAutoCreateSchema( true );
  }
  if ( "create-drop".equals( autoSchemaExport ) ) {
   settings.setAutoCreateSchema( true );
   settings.setAutoDropSchema( true );
  }