hi!
i'm trying to extend the default sql dialect for mysql and add a new function (that is recognized by the mysql 4 syntax). i've created the class below and set the dialect property accordingly. however, when i run a hql query that uses the newly added function i get an exception that makes me think hibernate doesn't recognize this function...
could you explain me what i did wrong?
thanks!

My dialect class:
package com.sm.sfa.dialect;

import net.sf.hibernate.Hibernate;
import net.sf.hibernate.dialect.StandardSQLFunction;

public class MySQLDialect extends net.sf.hibernate.dialect.MySQLDialect {
public MySQLDialect()
{
super();

registerFunction("TIME_TO_SEC", new StandardSQLFunction(Hibernate.LONG));
}
}


Hibernate version: Hibernate 2

Mapping documents: hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>

<!-- a SessionFactory instance listed as /jndi/name -->
<session-factory
name="java:comp/env/hibernate/SessionFactory">

<!-- properties -->
<property name="connection.datasource">my/first/datasource</property>

<property name="dialect">myPackage.MySQLDialect</property>

<property name="show_sql">false</property>
<property name="use_outer_join">true</property>
<property name="transaction.factory_class">
net.sf.hibernate.transaction.JTATransactionFactory
</property>
<property name="jta.UserTransaction">java:comp/UserTransaction</property>
</session-factory>

</hibernate-configuration>

Code between sessionFactory.openSession() and session.close():
String q = "SELECT ag.id, TIME_TO_SEC(ag.data) " +
"FROM com.sm.sfa.mapping.Sfa_agenti as ag ";
Query query = sess.createQuery(q);
List lista = query.list();
out.println("Results:"+lista.size());

Full stack trace of any exception that occurs:
net.sf.hibernate.QueryException: undefined alias: TIME_TO_SEC [SELECT ag.id, TIME_TO_SEC(ag.data) FROM com.sm.sfa.mapping.Sfa_agenti as ag ]
at net.sf.hibernate.hql.PathExpressionParser.token(PathExpressionParser.java:103)
at net.sf.hibernate.hql.ParserHelper.parse(ParserHelper.java:29)
at net.sf.hibernate.hql.SelectParser.token(SelectParser.java:170)
at net.sf.hibernate.hql.ClauseParser.token(ClauseParser.java:87)
at net.sf.hibernate.hql.ClauseParser.end(ClauseParser.java:114)
at net.sf.hibernate.hql.PreprocessingParser.end(PreprocessingParser.java:143)
at net.sf.hibernate.hql.ParserHelper.parse(ParserHelper.java:30)
at net.sf.hibernate.hql.QueryTranslator.compile(QueryTranslator.java:149)
at net.sf.hibernate.hql.QueryTranslator.compile(QueryTranslator.java:138)
at net.sf.hibernate.impl.SessionFactoryImpl.getQuery(SessionFactoryImpl.java:294)
at net.sf.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:1562)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1533)
at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
at com.sm.iess.TimpiSyncServlet.doGet(TimpiSyncServlet.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)

Name and version of the database you are using: MySql 4.0

the package name declared with the dialect class is the same with the package name written in the sql dialect property, i just pasted it wrong here... sorry