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Hibernate hbm2ddl.auto possible values and what they do?

I really want to know more about the update, export and the values that could be given to hibernate.hbm2ddl.auto
I need to know when to use the update and when not? And what is the alternative?

These are changes that could happen over DB:

  • New tables
  • new columns in old tables
  • columns deleted
  • data type of a column changed
  • a type of a column changed it attributes
  • tables have been dropped
  • values of a column has changed
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The configuration property is called hibernate.hbm2ddl.auto

In our development environment we set hibernate.hbm2ddl.auto=create-drop to drop and create a clean database each time we deploy, so that our database is in a known state.

In theory, you can set hibernate.hbm2ddl.auto=update to update your database with changes to your model, but I would not trust that on a production database. An earlier version of the documentation said that this was experimental, at least; I do not know the current status.

Therefore, for our production database, do not set hibernate.hbm2ddl.auto - the default is to make no database changes. Instead, we manually create

an SQL DDL update script that applies changes from one version to the next.

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