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JDBC and Relational Databases

How to retrive data two times from database in sinble jsp page.

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posted 16 years ago

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Hi,
I am trying to retrieve data from table in two times.
In first query I am displaying all data available in table.
Now I want to count the no. Of rows available in the same table by using select count(*)from table-name type query.
How can I retrieve records of same table by firing these two queries in single jsp page :
Please Tell me how to execute to query un single jsp page.
Here is an page where i able to fired the single query to display the table
:

<%-- 
    Document   : fillquestion
    Created on : Jul 18, 2008, 10:07:43 AM
    Author     : user1
--%>
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page language ="java" %>
<%@ page import="java.sql.*, javax.sql.*, javax.naming.*,java.io.*,java.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
 
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Fill-up-Question</title>
    </head>
    <body>
    <form name="fill-ok" action="fill-question-ok.jsp" method="POST">
        
        <table width="50%" border="1" borderColor="#000066" cellspacing="0" cellpadding="5" align="center">
              <TBODY>
<tr>
<td colspan="8" align="middle" class="StripColor">
<font class="FontGeneralBoldWhite">Fill Up the Question</font>
                        
</td>
</tr> 
        
        <%
        String ID=request.getParameter("id"); 
        String EVENTID=request.getParameter("even");
        Connection connection = null;
        Statement st = null;
        ResultSet rs = null;
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mynewdatabase","root", "root123");
         st=con.createStatement();
           try {
            rs = st.executeQuery("SELECT * FROM questionbank where questionid='"+ID+"'LIMIT 5");
        
         while ( rs.next() )
   {
            %>
            
                      
 
    <tr>
             <input type="hidden" name="Event" value="<%=request.getParameter("event")%>"/>
             <input type="hidden" name="ID" value="<%=request.getParameter("id")%>"/>
             <input type="hidden" name="QseriNO" value="<%=rs.getString("qserialno")%>"/>

Thanks in advance
.................
Harshal

Saicharan velury

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Posts: 3

posted 16 years ago

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hi harshal
from your query and code displayed i understand that you are trying to display the details of a particular question from the question table.

you have done one part that is displaying the details from a table which is your first doubt

solution to your second doubt is quite simple
create another Statement st1 and another ResultSet rs1
now in the same jsp after you have closed the existing st and rs
<code>
st1.executeQuery("select count(*) from question");
int count=0;
while(rs1.next())
{
count=rs1.getInt(1);
}
out.println(count);
</code>

i am sure this will give you the count of the questions in the same jsp page.

Paul Clapham

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Posts: 28333

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posted 16 years ago

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Why don't you just count the rows as you process them? Then you would not need to do that second query.

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Skill verified by Paul Clapham

Harshal Gurav

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Posts: 151

posted 16 years ago

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Hi saicharan,
Thank you very much for your post.
you suggested code is worked fine with given output as no of question in
that particular question bank.
Regards
Harshal

Harshal Gurav

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Posts: 151

posted 16 years ago

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Hi,
I am Trying to pass an integer value that is an no. of row of table to next jsp page. for that i am trying to convert int value to string format but showing error in marked lines:

<%-- 
    Document   : fillquestion
    Created on : Jul 18, 2008, 10:07:43 AM
    Author     : user1
--%>
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page language ="java" %>
<%@ page import="java.sql.*, javax.sql.*, javax.naming.*,java.io.*,java.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
 
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Fill-up-Question</title>
    </head>
    <body>
    <form name="fill-ok" action="fill-question-ok.jsp" method="POST">
        
        <table width="50%" border="1" borderColor="#000066" cellspacing="0" cellpadding="5" align="center">
              <TBODY>
<tr>
<td colspan="8" align="middle" class="StripColor">
<font class="FontGeneralBoldWhite">Fill Up the Question</font>
                        
</td>
</tr> 
        
        <%
        String ID=request.getParameter("id"); 
        String EVENTID=request.getParameter("even");
        Connection connection = null;
        Statement st = null;
        Statement st1 = null;
        ResultSet rs = null;
        ResultSet rs1 = null;
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mynewdatabase","root", "root123");
         st=con.createStatement();
           try {
            rs = st.executeQuery("SELECT * FROM questionbank where questionid='"+ID+"'LIMIT 5");
        
         while ( rs.next() )
   {
            %>
            
                      
 
    <tr>
             <input type="hidden" name="Event" value="<%=request.getParameter("event")%>"/>
             <input type="hidden" name="ID" value="<%=request.getParameter("id")%>"/>
             <input type="hidden" name="QseriNO" value="<%=rs.getString("qserialno")%>"/>

<td><%=rs.getString("qserialno")%>:  <b>Question:</b>
               <%=rs.getString("questionname")%>
</td>
                </tr>
                <tr>
                 //<td><input type="hidden" name="QserialNO" value="<%=request.getParameter("Qserialno")%>"></td>
                <td><b>A:</b><input type="radio" name="answer<%=rs.getString("qserialno")%>" value="A" /><%=rs.getString("OptionA")%></td>           
                <td><B>B:</B><input type="radio" name="answer<%=rs.getString("qserialno")%>" value="B" /><%=rs.getString("OptionB")%></td>
                <td><B>C:</B><input type="radio" name="answer<%=rs.getString("qserialno")%>" value="C" /><%=rs.getString("OptionC")%></td> 
                <td><B>D:</B><input type="radio" name="answer<%=rs.getString("qserialno")%>" value="D" /><%=rs.getString("OptionD")%></td>                 
                </tr>             
        <%
                           }
 
                       }   finally
                       {
                           if (rs != null)
                           {
                               rs.close();
                               rs = null;
                           }
                           if (st != null)
                           {
                               st.close();
                               st = null;
                           }
 
                       }
                       %>
                       <%
                       st1=con.createStatement();
                     [B]try {  [/B]// [B]try without catch[/B]
                         rs1=st1.executeQuery("select count(*) from questionbank where questionid='"+ID+"'");
                        int count=0;
                        while(rs1.next())
                            
                       {
                         count=rs1.getInt(1);
                         String myString = String.valueOf(count);                         
                         [B]<input type="hidden" name="myFormField" value="<%=myString %>">[/B] //can not find synbol input                        %>                                              
                         }
                         out.println(count);
                         
                        } finally
                       {
                           if (rs1 != null)
                           {
                               rs1.close();
                               rs1 = null;
                           }
                           if (st1 != null)
                           {
                               st1.close();
                               st1 = null;
                           }
 
                       }
                      
                     %>
                   
 
 
 
    </table>
    
    <tr>
                <TD>                                                                <input type="submit" value="SUBMIT" name="submit" /></TD>
                <td><input type="reset" value="RESET" name="reset" /></td>
                    
       </tr>
               
   </form>
   </body>
   </html>

Kindly suggest me an updated code.
Thanks and Regards
Harshal

Rajkumar balakrishnan

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Posts: 445

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posted 16 years ago

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Is it the actual code that you use.. If so then it's simple... Your code is like this

Just open and close the scriplet tags in proper place like the below one...

Just look at the code that is in BOLD... It use proper scriplets... Hope you will be clear in future..
[ July 23, 2008: Message edited by: Rajkumar balakrishnan ]

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