session.update不能直接用，因為他是以ID為主鍵，必須查詢出ID才能進行更新。。。

Usertable user=null;

Session session=HibernateSessionFactory.getSession();
String sql="from Usertable as user where user.username=?";
Query q=session.createQuery(sql);
q.setString(0,username);
List l=q.list();
Iterator ite=l.iterator();
if(ite.hasNext()){
   user=(Usertable)ite.next();
  
}
return user;

查詢完以后才能更新用SESSION.UPDATE就行了。

請高手教教我吧.
在hibernate中查詢數(shù)據(jù),查詢語句中包含sql函數(shù)String sql = (select * from employee emp where left(dbo.f_GetPy(name,1)='要查詢的字母')
其中dbo.f_GetPy(name),1)為sql server 2000中的自定義函數(shù),"name"是列名。其作用是按漢字的字符串的第一個字的英文首字母查出相應的字符串（按首字母查詢）。
我用的是List list = session.createSQLQuery(sql)
.addEntity("emp",Employee.class)
.list() ;
方法。
報的錯誤是.list()那行。sql語句在查詢分析器中試過了，沒問題。具體錯誤代碼如下：

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: could not execute query
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
yfy.struts.MyActionServlet.process(MyActionServlet.java:17)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause

org.hibernate.exception.SQLGrammarException: could not execute query
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:67)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
org.hibernate.loader.Loader.doList(Loader.java:2148)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
org.hibernate.loader.Loader.list(Loader.java:2024)
org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:111)
org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1655)
org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:164)
yfy.dao.BaseDaoImpl.execSQLQuery(BaseDaoImpl.java:138)
yfy.struts.action.EmpNameListAction.execute(EmpNameListAction.java:40)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
yfy.struts.MyActionServlet.process(MyActionServlet.java:17)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

請高手們幫我解答。謝謝