Using Postgresql with Grails : Missing sequence or

问题:

I'm having trouble with Grails 2.0 and Postgresql 9.1

I'm trying to map an existing database, with sequential ids. However, even without creating any class in the domain, I'm having the error :

Compiling 1 source files.....
| Running Grails application
| Error  executing bootstraps:
      Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; 
      nested exception is org.springframework.beans.factory.BeanCreationException:
      Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory';
      (...)
      Invocation of init method failed; nested exception is org.hibernate.HibernateException:
           Missing sequence or table: hibernate_sequence

My Datasource is :

dataSource {
    pooled = true
    driverClassName = "org.postgresql.Driver"
    username = "postgres"
    password = "postgrespass"
    dialect = org.hibernate.dialect.PostgreSQLDialect
    logSql = true
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = true
    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}
// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = "" 
            url = "jdbc:postgresql://localhost:5432/Rambo"
        }
    }
}

Tee exisiting database is a Poker software database (Holdem manager). I was working on a PlayerHand object that doesn't use a sequence, but the Player object has a sequence table.

What is strange is that on a previous program, I was quite easily able to make the Player object working with Postgresql 8.3 & Grails 2.0.

回答1:

You probably have one of the entities using a sequence ID generator without any sequence name configured, and Hibernate thus uses the default sequence name: hibernate_sequence, but doesn't find it.

Configure the sequence name (and use an existing sequence), or create the hibernate_sequence sequence in database, or don't use a sequence-based generator.

回答2:

You can configure Postgres to use one sequence per table - I described that here: http://grails.1312388.n4.nabble.com/One-hibernate-sequence-is-used-for-all-Postgres-tables-td1351722.html

But you'll still need to create the sequence(s). dbCreate='update' doesn't create sequences (only create and create-drop do) so you'll need to manually create them or use a migration tool like http://www.grails.org/plugin/database-migration