hibernate如何执行DB2序列查询?报错

在SQL语句中执行

nextval for SEQ_CN

public String getCertCN(){
		String hql = "values nextval for SEQ_CN";
		Query query=createQuery(hql);
		List ret = query.list();
		String template = "CSDCWEB";
		System.out.println("测试生成的CN");
		String result = (String) ret.get(0);
		for( int i = 0 ;i<9-result.length();i++)
			template += "0";
		return template+result;
}

10:46:28,367 ERROR PARSER:56 - line 1:1: unexpected token: values
java.lang.IllegalArgumentException: node to traverse cannot be null!
	at org.hibernate.hql.ast.util.NodeTraverser.traverseDepthFirst(NodeTraverser.java:63)
	at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:280)
	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:182)
	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
	at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:98)
	at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
	at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
	at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1760)