hibernate更新数据库时报了个错误，请教一下大家?报错

以下是报错，是说我HQL语句有问题

Exception in thread "main" org.hibernate.hql.internal.ast.QuerySyntaxException: login is not mapped [update login set pastf=? where id =?] at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76) at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150) at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:302) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:240) at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1907) at com.wangliang.mail.java_mail.mailHeader(java_mail.java:172) at com.wangliang.mail.java_mail.main(java_mail.java:205) Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: login is not mapped at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:171) at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79) at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:321) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3704) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3593) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:718) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.updateStatement(HqlSqlBaseWalker.java:375) at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:267) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262) at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190) ... 9 more

以下是我执行语句的代码

Transaction tran = session2.beginTransaction();
 			Query query = session2.createQuery("update login set pastf=? where id =?");
 			query.setString(0, "账号或密码错误！");
 			query.setString(1, user);
 			query.executeUpdate();
 			tran.commit();