org.hibernate.hql.ast.QuerySyntaxException，请达人进来看看

Question

org.hibernate.hql.ast.QuerySyntaxException: User is not mapped [select u from User u where u.userName=:userName and u.password=:password]
at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:158)
at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:87)
at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:70)
at org.hibernate.hql.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:257)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3056)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:228)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at $Proxy0.createQuery(Unknown Source)
at org.kf.dao.impl.UserDaoImpl.userLogin(UserDaoImpl.java:40)
at org.kf.biz.UserBiz.userLogin(UserBiz.java:19)
at test.Test.main(Test.java:13)好像是hql问题吧，我检查半天也没有看出来哪错了啊

Answer 1

public User userLogin(String userName, String password) {
User user = null;
        Session session = null;
        Transaction tran = null;
        try{
            session = HibernateUtil.getSession();
            tran = session.beginTransaction();
            String hql = "select u from User u where u.userName=:userName and u.password=:password";
            Query query = session.createQuery(hql);
            query.setString("userName", userName);
            query.setString("password", password);
            user = (User)query.uniqueResult();
            tran.commit();
        }catch(Exception e){
            tran.rollback();
            e.printStackTrace();
            throw new NoSuchUserException("login error!");
        }
        return user;
}
这是那一段代码

Answer 2

lz看下hibernate.cfg.xml中是不是少了<mapping resource=" " />这个东西

Answer 3

lz，你看看报错提示，显示是User类没有映射，2楼说的对，你检查一下。

Answer 4

select u from Users    u ?

Answer 5

我也是这个问题。
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration> <session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/inter_telecom
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">
com.mysql.jdbc.Driver
</property>
<property name="connection.password">root</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<mapping resource="domain/Domain.hbm.xml" /> </session-factory></hibernate-configuration>
<mapping resource....有注明....一直就一样的状态

Answer 6

我和你一样的问题，解决了，hql中一个中文空格，一般这种问题都是小细节问题，多多检查。

Answer 7

hql的查询语句是对类查询的  而不是具体的表，所以看看你的类名是不是写正确了

Answer 8

8楼一语惊醒梦中人啊，我把from User 写成了from user  

Answer 9

HQL里中文空格 我也看了好久硬是没看出来 于是乎 重打了一边 Ok 搞定