问题描述
- Hibernate 的 getSessionFactory();方法 5C
- 在下自学Hibernate方法有错误之处请各位多多指点
废话少说直接上代码
DAOImpl 中的代码:public class UserDAOImpl extends HibernateTemplate implements UserDAO {
private SessionFactory factory;@Overridepublic User findUserByName(String name) { System.out.println(""进来了DAO层""); try{ //修改开始处 Configuration conf = new Configuration(); conf = conf.configure(); factory = conf.buildSessionFactory(); //修改结束处 }catch (Throwable ex) { System.err.println(""Failed to create sessionFactory object."" + ex); throw new ExceptionInInitializerError(ex); } Session session = factory.openSession(); Transaction tx = null; List<User> users = new ArrayList<User>(); try{ tx = session.beginTransaction(); String hql = ""FROM User U WHERE U.name = :name""; Query query = session.createQuery(hql); query.setParameter(""name""name); users = (List<User>)query.list(); tx.commit(); }catch (HibernateException e) { if (tx!=null) tx.rollback(); e.printStackTrace(); }finally { session.close(); } return users.get(0);}public void setFactory(SessionFactory factory) { this.factory = factory;}}
dao.xml 中的配置:
<bean id=""userDAO"" class=""com.ssh.dao.UserDAOImpl""> <property name=""hibernateTemplate"" ref=""hibernateTemplate""></property></bean><bean id=""hibernateTemplate"" class=""org.springframework.orm.hibernate3.HibernateTemplate""> <property name=""sessionFactory"" ref=""sessionFactory""></property></bean>这种情况下系统是没有错的.只不过查询的结果非常慢
所以我准备换成用Spring来管理hibernate的数据库懒加载
为了大家看的明白 我就只修改了
//修改开始处 和//修改结束处 中间的代码替换成了:
factory = this.getHibernateTemplate().getSessionFactory();
就这样系统就报错了
贴上错误提示
org.hibernate.hql.ast.QuerySyntaxException: User is not mapped. [FROM User U WHERE U.name = :name] at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:157) 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:265) at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3049) at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2938) 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:218) at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:158) at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:109) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:75) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:54) at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:71) 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:1583) at com.ssh.dao.UserDAOImpl.findUserByName(UserDAOImpl.java:44) at com.ssh.service.UserServiceImpl.getUserByUserName(UserServiceImpl.java:14) at com.ssh.action.loginAction.login(loginAction.java:14) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452) at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485) at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:745)Caused by: User is not mapped. ... 87 more提示 User is not mapped (我是知道hql中的User 并不是数据库中的表名所以这里不会错的)
那么为什么会提示User没有在数据库中映射????所以请问各位大神这是错在哪了.有需要贴别的地方的代码请尽管说.
我把我所有的币都献上了应要求 贴上user.hbm.xml的代码:
<hibernate-mapping> <class name=""com.ssh.entity.User"" table=""user""> <id name=""id"" type=""int"" column=""id""> </id> <property name=""name"" column=""name"" type=""string""/> <property name=""password"" column=""password"" type=""string""/> </class></hibernate-mapping>
解决方案
解决方案二：
http://www.cnblogs.com/luotaoyeah/p/3862974.html
解决方案三：
首先：在使用this.getHibernateTemplate() 时，你的类要继承HibernateSupport类，然后貌似只有hibernate3中可以这样用，所以要看你hibernate的版本是多少
解决方案四：
查看一下你的User.hbm.xml里面是否正确
解决方案五：
修改前，，报这个错误了吗？
解决方案六：
看到了，，没报错，，你可以直接用hibernateTemplate的find方法查询
解决方案七：
你把User换成user试试因为你的xml文件中用的user或者把xml中的user换成User 然后重启，hql语言用的是实体类，但你的实体类没有贴出来，不知道你怎么写的，是否用的注解？你先试试吧
时间： 2024-09-20 00:25:37