Grails中的数据库迁移插件的Hibernate问题

Question

I have a migration with a "grailsChange" changeSet, which constantly generates a

org.hibernate.HibernateException: connnection proxy not usable after transaction completion

grailsChange {
   change {
      def list1 = [record1,record2]
      list1.each {
         DomainClass.withTransaction {
            new DomainClass(it).save(failOnError: true)
         }
      }
   }
}

Answer 1

We had the same problem. The solution in our case was, that we called a service method from beforeValidate of the Domain Class and the service was transactional. so Adding static transactional = false to the service fixed our problem.

Answer 2

I ran into the same problem when writing a migration that used grailsChange . In my case, it would run hundreds of transactions successfully, and then fail on the outermost transaction that is most likely associated with the grailsChange itself.

Switching from withTransaction to withNewSession resolved the issue.

You should not need to manually flush the new session . If you continue to run into issues, I'd suggest adding validate:true and flush:true to the save call and making use of the error(String message) method in GrailsChange.groovy .

grailsChange {
    change {
        def list1 = [record1,record2]
        list1.each {
            DomainClass.withTransaction {
                def domain = new DomainClass(it)
                if (!domain.save(validate: true, flush: true)) {
                    error("There was a problem saving the domain.")
                }
            }
        }
    }
}