Question

JSP + Bean + Recordset + DropDown

Asked by: gocraig

I am in the process of creating a number of forms some/all of which will contain various drop down lists that need to be populated using data from the database.

I have constructed a Bean that takes an input parameter stating what static data I require, and I am able to include and execute this bean from my JSP page as follows

 <% ResultSet rs = sd.StaticData("TitleData"); %>

Its response as you can see from my code is a ResultSet that I am then trying to put into a Drop Down box, so something like :-

                <% while (rs.next()  )
                   {
                %>
                <option value=<%= rs("id") %> > <%= rs("title") %> </option>
                <%
                   rs.next();
                   }
                   rs.close;
                   set rs=nothing;
                %>
The initial bit of code seems to work offine, there is data in the appropriate table and a sequence that is used by apache to test Db Connections increments by one each time the process is run, signifying a connection.

When I add the second bit of code however, it bums out stating

javax.servlet.ServletException: Connection is closed.  Operation is not permitted.
      org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:673)
      org.apache.jsp.Registration.PersonalDetails_jsp._jspService(PersonalDetails_jsp.java:390)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


Any thoughts ??

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Asked On
2003-12-03 at 13:07:43ID20815641
Tags

jsp

,

recordset

,

bean

,

down

,

dropdown

Topic

Java Server Pages (JSP)

Participating Experts
2
Points
50
Comments
7

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Answers

 

by: gocraigPosted on 2003-12-03 at 13:35:09ID: 9870033

I have just added code as follows in the JSP

ResultSetMetaData = rsmd = rs.getMetaData();

And have then added a couple of table rows/cells and the code

rsmd.getColumnCount()
rsmd.getColumnName(1)
rsmd.getColumnName(2)

this worked fine and told me the names of the columns that I was expecting, so the result set is getting as far as the JSP.

I then added some manipulation, adding a further row/cell containing

rs.getString(1)

It bummed out again, same error.

Is this not allowed for some reason.The root cause given in the logs is

Connection is closed.  Operation is not permitted.
      org.postgresql.jdbc1.AbstractJdbc1ResultSet.next(AbstractJdbc1ResultSet.java:63)
      org.apache.commons.dbcp.DelegatingResultSet.next(DelegatingResultSet.java:135)
      org.apache.jsp.Registration.PersonalDetails_jsp._jspService(PersonalDetails_jsp.java:209)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

this has obvious references to PostgreSQL (my Db), is it because I am trying to manipulate the Resultset having passed it from Db to Bean to JSP ??

 

by: kokchoon78Posted on 2003-12-03 at 17:15:50ID: 9871394

The error shown because your database connection is closed. May i know where and when you close it ? is it in the sd.StaticData("TitleData"); ?

if so, you can retrieve all the data (rs.getString()) in the StaticData method and return the data as List or HashMap to your jsp page.

so, in your jsp :

<% List data = sd.StaticData("TitleData"); %>

<%
List singleData = null;
for( int i = 0 ; i < data.size() ; i ++ )
{
    singleData = (List) data.get(i);
%>
    <option value=<%= (String)singleData .get(1)%> > <%= (String)singleData .get(2)%> </option>
 <%
 }
 %>

 

by: kennethxuPosted on 2003-12-03 at 18:12:42ID: 9871677

you cannot access you resultset after  you close your connection.

 

by: kennethxuPosted on 2003-12-05 at 06:38:14ID: 9882462

gocraig, you might want to consider to re-grade, I B grade doesn't seem to be fair to kokchoon78.
http://www.experts-exchange.com/help/qnaFAQ.jsp#3

 

by: gocraigPosted on 2003-12-05 at 06:54:36ID: 9882556

Thanks for the advice Kenneth, but no.

As per the link you provided, a Grade A is only available when a an expert "provided you with a thorough answer or they provided you with a link to information that thoroughly answered your question".   kokchoon78 provided a guide, and asked for further information that would have enabled a fuller answer.

In fact from another forum I had got the answer that I needed, and implemented it before being notified of the answer here.  On that basis, I felt that a B was appropriate.

Anyway, if experts are going to start argueing about the grades given, doesnt that ruin the whole point.  Isnt this about asking for help and then grading the response you get, not being told you should give an A when you didnt think it appropriate ??

kokchoon78 has received a B, and has not responded that they are unhappy with that, so I will be leaving it there.

 

by: kennethxuPosted on 2003-12-05 at 07:58:24ID: 9882977

That's all right, it's your call as always :-) Just some facts that you might not aware of:
0. I gave such advise only to relatively new member and actully I was trying to help the asker not the expert.
1. A lot of experts will have a look at asker's grading history before they answer the question.
2. An A grade cost asker nothing, but do make difference in the points credit to the expert who tried to help.
3. There is no "thorough answer" exist for some types of question.

 

by: kokchoon78Posted on 2003-12-07 at 16:13:57ID: 9893661

Thank kennethxu, btw, is ok ;-)

20120131-EE-VQP-002

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