Retrieving a single value from sql:query

Question

Hi all, pretty new to jsp and tag libraries so appoligies if this isn't the correct forum or my question is a bit lame...
I've got a basic input form written in JSP and i'm trying to use AJAX to return a customers name when they input there customer IS. My AJAX interaction works ok and so far i have got it to return a string value to indicate if the customer ID is valid or invalid.
However, now i want to return the customers name based on a SELECT SQL statement. My sql works ok but i can't figure out how to return / access the single cname field that is returned. ALL the <sql:query> examples that i have seen use a <c:forEach> loop but this doesn't seem to work for me.
My AJAX / Jsp code looks like this:
<%@ page contentType="text/html" info="Customer Id Lookup" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<sql:setDataSource scope="application"
   driver="com.mysql.jdbc.Driver"
   url="jdbc:mysql://localhost:3306/dbawp"
   user="*******"
   password="********"
/>
<sql:query var="qryValidCustomer" >
    SELECT cname FROM camper WHERE cid = ?;
    <sql:param value="${param.data}"/>
</sql:query>
<c:choose>
<c:when test="${qryValidCustomer.rowCount == 0}">
unknown camper
</c:when>
<c:otherwise>
<c:forEach items="${qryValidCustomer.row}" var="row">
${fn:escapeXml(row.cname)}                                                         <- Doesn't seem to work - i get nothing returned
</c:forEach>
<%--good camper--%>
</c:otherwise>   
</c:choose>Can anyone point me in the right direction?
Manythanks in advance,
Sam

Answer 1

> my db fields contain a list of sections, " 1,2,3,4,"
When you find yourself storing delimited lists in a field,
that's a sign that you should
normalize
your data. Storing lists is difficult to query, error prone and bad
for performance.
A separate table should be used to represent a many-to-many
relationship.
Table - Columns
Advertisement - AdvertisementID, AdvertisementDescription,
...other columns
Type - TypeID, TypeTitle, ...
AdvertisementType - AdvertisementID, TypeID
Instead of storing the related types as a list
AdvertisementID | TypeID
1 | 1,2,3,4
Store them as separate records in the 3rd table
AdvertisementID, TypeID
1, 1 (ad # 1, type # 1)
1, 2 (ad # 1, type # 2)
1, 3 (ad # 1, type # 3)
1, 4 (ad # 1, type # 4)