Grails GORM Truncate Tables in H2

DataNukerService.groovy

package com.jetbootlabs.services

/*
 * Truncates H2 tables mapped by the domainClasses variable. Useful for cleaning up test data.
 * 
 * Temporarily disables referential integrity to avoid constraint violation errors when 
 * deleting records.
 * 
 * Inspired by Luke Daley's blog post on how to do this in MySQL:
 * http://ldaley.com/post/398082618/brute-force-fixture-cleanup-in-grails
 */
class DataNukerService {

    def sessionFactory
    def dataSource
    def grailsApplication

    def execute() {
        sessionFactory.currentSession.flush()
        def db = new Sql(dataSource)
        db.withBatch { stmt ->
            stmt.addBatch("SET REFERENTIAL_INTEGRITY FALSE")
            def domainClasses = grailsApplication.domainClasses*.clazz
            domainClasses.each { domainClass ->
                def metadata = sessionFactory.getClassMetadata(domainClass)
                stmt.addBatch("TRUNCATE TABLE ${metadata.tableName}")
            }
            stmt.addBatch("SET REFERENTIAL_INTEGRITY TRUE")
        }
        sessionFactory.currentSession.clear()
    }
}