当 hibernate.hbm2ddl.auto 设置为创建时，如果 postgresql 需要，我如何让 hibernate 执行 CREATE DATABASE

Question

I am using spring-roo , gwt and hibernate to make a website. We are using the in memory database HyperSonic, but I am trying to switch to postgres .

Everything works fine if I used the jdbc3 driver . The only problem is I have to separately execute the CREATE DATABASE statement outside of hibernate before it will create the tables via [hibernate.hbm2ddl.auto](http://docs.jboss.org/hibernate/core/3.3/reference/en/html/session-configuration.html#configuration-optional) being set to create. Is their another option I can set to cause hibernate to do the CREATE DATABASE if necessary?

Answer 1

Not really. You have to do a CREATE DATABASE using a template database (normally template1 ). The normal sequence of events is:

1. Connect to template1 database
2. Execute CREATE DATABASE newdb;
3. Reconnect to the newdb;
4. Begin issuing DDL statements.

If you're interested in more information, look in to the specifics of how PostgreSQL completes the CREATE DATABASE and you'll understand why.