Using simple functions in JSP

Hi to all,
I would to use simple functions in my jsp page.
I 've created the function with the tags <%! ... %>
My problem is that i don't succed to call there from the page.
How i can to do ?
I've tried also with java beans but i'm not very clever with there also so i don't can to go forward !!!
Please help me. thanks

Hi, a new problem rises now.
the problem is into the method ctr_data().
Under i put the jsp code and the error:
Anyone can see where is the error please?
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import= "java.sql.*, java.lang.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Progetto Sofia - Registrazione utente</title>
</head>
<%!
public boolean ctr_lunghezza(String s1){
    if (s1.length() == 0) return false;
    return true;
%>
<%!
public boolean isLeapYear(int year) {
       if (year%400 == 0) return true;
       if ((year%4 == 0) && (year%100 != 0))return true;
       return false;
%>
<%!
public boolean ctr_data (String gg, String mm, String aa){
    int anno = Integer.valueOf(aa).intValue();
    int mese = Integer.valueOf(mm).intValue();
    int giorno = Integer.valueOf(gg).intValue();
    if ((gg.length() == 0) || (mm.length() == 0) || (aa.length() == 0))
        return false;
    if ((anno < 1905) || (anno > 2005))
        return false;
    if (mese == 2){
        if (isLeapYear(anno)){
            if (giorno > 29) return false;
        }else{
            if (giorno > 28) return false;
    if ((mese == 11) || (mese == 4) || (mese == 6) || (mese == 9)){
        if (giorno == 31) return false;
    return true;
%>
<%
int flag = 0;
String risposta = "";
String temp ="";
temp = (request.getParameter("nome_utente")!=null)?request.getParameter("nome_utente") :"";
if (ctr_lunghezza (temp) == false){
   risposta = risposta.concat("Attenzione --- Riempire il campo: Nome\n");
   flag++;
temp = (request.getParameter("cognome_utente")!=null)?request.getParameter("cognome_utente"):"";
if (!ctr_lunghezza (temp)){
    risposta = risposta.concat("Attenzione --- Riempire il campo: Cognome\n");
    flag++;
String gg1 = (request.getParameter("giorno_n_utente")!=null)?request.getParameter("giorno_n_utente"):"0";
String mm1 = (request.getParameter("mese_n_utente")!=null)?request.getParameter("mese_n_utente"):"0";
String aa1 = (request.getParameter("anno_n_utente")!=null)?request.getParameter("anno_n_utente"):"0";
if (!ctr_data(gg1, mm1, aa1)){
    risposta = risposta.concat("Attenzione --- Data di nascita non corretta\n");
    flag++;
temp = (request.getParameter("luogo_n_utente")!=null)?request.getParameter("luogo_n_utente"):"";
if (!ctr_lunghezza (temp)){
    risposta = risposta.concat("Attenzione --- Riempire il campo: Luogo di nascita\n");
    flag++;
temp = (request.getParameter("res_utente")!=null)?request.getParameter("res_utente"):" ";
if (temp == "Seleziona"){
    risposta = risposta.concat("Attenzione --- Selezionare il Comune di Residenza\n");
    flag++;
temp = (request.getParameter("ind_utente")!=null)?request.getParameter("ind_utente"):" ";
if (!ctr_lunghezza(temp)){
    risposta = risposta.concat("Attenzione --- Riempire il campo Indirizzo\n");
    flag++;
%>and this is the error msg:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: For input string: ""
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NumberFormatException: For input string: ""
     java.lang.NumberFormatException.forInputString(Unknown Source)
     java.lang.Integer.parseInt(Unknown Source)
     java.lang.Integer.valueOf(Unknown Source)
     org.apache.jsp.progetto.w2.web.Reg_005futente_jsp.ctr_data(org.apache.jsp.progetto.w2.web.Reg_005futente_jsp:27)
     org.apache.jsp.progetto.w2.web.Reg_005futente_jsp._jspService(org.apache.jsp.progetto.w2.web.Reg_005futente_jsp:122)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

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17      --
18      dbms_output.put_line(l_count||' employees were counted.');
19      --
20    end;
21 end test_pkg;
22 /
Waarschuwing: package-body is aangemaakt met compilatiefouten.
HR%xe> sho err
Fouten voor PACKAGE BODY TEST_PKG:
LINE/COL ERROR
14/5     PL/SQL: SQL Statement ignored
16/34    PL/SQL: ORA-00904: "PRIVATE_FUNC": invalid identifier
16/34    PLS-00231: function 'PRIVATE_FUNC' may not be used in SQL
HR%xe> create or replace package test_pkg
2 as
3
4    function private_func
5    return date;
6
7    procedure public_proc;
8 end test_pkg;
9 /
Package is aangemaakt.
HR%xe> create or replace package body test_pkg
2 as
3    function private_func
4    return date
5    is
6    begin
7     return(sysdate);
8    end;
9
10    procedure public_proc
11    is
12      l_count number := 0;
13    begin
14      select count(*) into l_count
15      from   employees
16      where employees.hire_date < private_func;
17      --
18      dbms_output.put_line(l_count||' employees were counted.');
19      --
20    end;
21 end test_pkg;
22 /
Package-body is aangemaakt.
HR%xe> exec test_pkg.public_proc
107 employees were counted.
PL/SQL-procedure is geslaagd.Once you declare your function in your package specification as well, you can use your function in your procedure.
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14251/adfns_packages.htm#sthref823

Using Aggregate function in queries

Hi all,
          Please take a look on this query and suggest me why i'm getting the error..
This is my simple query using aggregate function in it..
SELECT T1.NAME, T1.DESCRIPTION, SUM(T2.QUANTITY)
FROM TABLE1 T1, TABLE2 T2
WHERE T1.ID=T2.ID
GROUP BY T1.NAME, T1.DESCRIPTION
Above query added with a sub-query in the select segment..
SELECT T1.NAME, T1.DESCRIPTION, SUM(T2.QUANTITY), (SELECT AVG(T3.PRICE) FROM TABLE1 TT1, TABLE3 T3 WHERE TT1.ID=T3.ID AND TT1.ID=T1.ID) AV_PRICE
FROM TABLE1 T1, TABLE2 T2
WHERE T1.ID=T2.ID
GROUP BY T1.NAME, T1.DESCRIPTION
When i add a sub-query which has aggregate function in it, i'm getting the 'ORA-00979: not a GROUP BY expression' error.

What is your DB Version. Your query works without any issue in my DB. I used WITH clause to create the sample data. The query highlighted in BLUE is the actual query.
SQL> select * from v$version where rownum = 1;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
SQL> with table1
2 as
3 (
4    select 1 id, 'karthick' name, 'user name' description from dual
5 ),
6 table2
7 as
8 (
9    select 1 id, 100 quantity from dual
10 ),
11 table3
12 as
13 (
14    select 1 id, 10 price from dual
15 )
16 select t1.name
17       , t1.description
18       , sum(t2.quantity)
19       , (
20           select avg(t3.price)
21             from table1 tt1
22                , table3 t3
23            where tt1.id = t3.id
24              and tt1.id = t1.id
25         ) av_price
26    from table1 t1
27       , table2 t2
28   where t1.id = t2.id
29   group
30      by t1.name
31       , t1.description;
NAME     DESCRIPTI SUM(T2.QUANTITY)   AV_PRICE
karthick user name              100         10
SQL>

Using simple functions in JSP

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