Hibernate Schema tools

The hbm2ddl.auto column indicates the values for the hbm2ddl.auto property in the hibernate configuration file

The Purpose column indicates what is the impact of using the specified hbm2ddl.auto value

The Class Name column indicates how to achieve the “purpose” programmatically.

 

hbm2ddl.auto option	Purpose	Class name
create or create-drop or	create – to drop the schema and create it whenever SessionFactory is built create-drop – to drop the schema when SessionFactory is closed.	SchemaExport e.g. SchemaExport ex = new SchemaExport( new Configuration().configure() ); Ex.create(false, true); // false – don’t print sql to stdout // true – Execute ddl immediately on database
Update	Update – Read the schema through JDBC driver (not reliable) and make schema changes to fit the schema to mappings	SchemaUpdate e.g. SchemaUpdate su = New SchemaUpdate(new Configuration().configure() ); Su.execute(false); // don’t print ddl on stdout
Validate	Validator – compare mapping with metadata and throw exception if they do not match.	SchemaValidator e.g. new SchemaValidator(new Configuration().configure()).validate()