For hbm2ddl.auto property the list of possible options is: validate: validate that the schema matches, make no changes to the schema of the database, you probably want this for production. update: update the schema to reflect the entities being persisted create: creates the schema necessary for your entities, destroying any previous data. create-drop: create the … Read more
Just omitting hibernate.hbm2ddl.auto defaults to Hibernate not doing anything. From the reference documentation: 1.1.4. Hibernate configuration The hbm2ddl.auto option turns on automatic generation of database schemas directly into the database. This can also be turned off by removing the configuration option, or redirected to a file with the help of the SchemaExport Ant task. Setting … Read more
Thanks to the answers by Vlad and Gunnar, I’ve managed to find my way through the new configuration API to produce the equivalent export logic with the following. Of course, history shows that this API will break again, so make sure to choose the appropriate version: Hibernate 5.2: MetadataSources metadata = new MetadataSources( new StandardServiceRegistryBuilder() … Read more
Actually I just checked <property name=”hibernate.hbm2ddl.auto” value=”update” /> is even creating tables for the first time and then later if table/schema exist it does update. Update property is applicable when starting or adding a new model. You want to retain the earlier saved entity instances. This is the default schema creation style. It tries to … Read more
hibernate.hbm2ddl.auto” value=”update won’t modify existing table column definitions. Doing some testing I found that: hibernate.hbm2ddl.auto” value=”update will add a db column that doesn’t already exist. hibernate.hbm2ddl.auto” value=”update will not delete a db column that is removed/no longer in your entity. hibernate.hbm2ddl.auto” value=”update will not modify a db column that has already been created. You’ll need … Read more
No, it’s unsafe. Despite the best efforts of the Hibernate team, you simply cannot rely on automatic updates in production. Write your own patches, review them with DBA, test them, then apply them manually. Theoretically, if hbm2ddl update worked in development, it should work in production too. But in reality, it’s not always the case. … Read more
From the community documentation: hibernate.hbm2ddl.auto Automatically validates or exports schema DDL to the database when the SessionFactory is created. With create-drop, the database schema will be dropped when the SessionFactory is closed explicitly. e.g. validate | update | create | create-drop So the list of possible options are, validate: validate the schema, makes no changes … Read more