source: trunk/src/grails-app/conf/DataSource.groovy @ 39

dataSource {
        pooled = true
        driverClassName = "org.hsqldb.jdbcDriver"
        username = "sa"
        password = ""
}
hibernate {
    cache.use_second_level_cache=true
    cache.use_query_cache=true
    cache.provider_class='com.opensymphony.oscache.hibernate.OSCacheProvider'
}

//environment specific settings
//create-drop:  drop tables and data between sessions, then insert from Bootstrap.
//create:       drop data between sessions, can't explain the rest.
//update:       keep data, update tables as required, keeps inserting from BootStrap.
environments {
        development {
                dataSource {
                        dbCreate = "create-drop" // one of 'create', 'create-drop','update'
                        url = "jdbc:hsqldb:mem:devDB"
                }
        }
        test {
                dataSource {
                        dbCreate = "update"
                        url = "jdbc:hsqldb:mem:testDb"
                }
        }
        production {
                dataSource {
                        //Delete dbCreate line after setup!
            dbCreate = "create-drop"
                        //url = "jdbc:hsqldb:file:prodDb;shutdown=true"
            url = "jdbc:hsqldb:mem:devDB"
                }
        }
}