| From: | João Paulo Ribeiro <jp(at)mobicomp(dot)com> |
|---|---|
| To: | David Goodenough <david(dot)goodenough(at)btconnect(dot)com> |
| Cc: | pgsql-jdbc(at)postgresql(dot)org |
| Subject: | Re: Problems with ResultSet |
| Date: | 2005-10-28 10:56:29 |
| Message-ID: | 436203DD.7070000@mobicomp.com |
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| Lists: | pgsql-jdbc |
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David is rigth. <br>
And try to avoid returning resultset. If your method need to return
something do it with your own objects.<br>
Do something like:<br>
<br>
-> get connection<br>
-> create statement on the connection<br>
-> execute statement and get resultset<br>
-> iterate resultset and create your own object with the information
needed<br>
-> close statement<br>
-> return the object you created with the information from the
resultset<br>
<br>
Note: if your using a pool always release the connection to the pool. <br>
<br>
<br>
Regards.<br>
João Paulo Ribeiro<br>
<br>
<br>
David Goodenough wrote:
<blockquote cite="mid200510281132(dot)29818(dot)david(dot)goodenough(at)btconnect(dot)com"
type="cite">
<pre wrap="">Closing the statement closes everything that came from it, i.e. the ResultSet.
So you need to delay closing the statement until after you have finished with
the ResultSet.
David
On Friday 28 October 2005 11:18, Aydın Toprak wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hiii,
I have just stuck with a little point of my code which generates "This
ResultSet is closed." exception ....
here is my stack trace ...
org.postgresql.util.PSQLException: This ResultSet is closed.
org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkClosed(AbstractJdbc2Result
Set.java:2444)
org.postgresql.jdbc2.AbstractJdbc2ResultSet.next(AbstractJdbc2ResultSet.jav
a:1810)
org.apache.jsp.event.Proposal.frameBuyer_jsp._jspService(org.apache.jsp.eve
nt.Proposal.frameBuyer_jsp:61)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802) ... and
continues...
I want to return ResultSet from static method (I have never did before,
I guess I can ..??.) ... I get resultset from my jsp page and want to
display it ...
so ı wrote this database access staff into another class file to sperate
them ... anyway..
try
{
stmnt = con.prepareStatement(query);
stmnt.setInt(1, event_id);
ps = stmnt.executeQuery();
stmnt.close();
connMgr.freeConnection("mypool", con);
if(ps.next())
out.append("This is your element :"+ps.getInt("event_id"));
}
this is the part of the code wich generated that exception...
as a result of my obeservations and try... I can directly point that the
porblem comes from this
if(ps.next())
out.append("This is your element :"+ps.getInt("event_id"));
part of the code...
but I dont understand why?.... the query is file, P.statement and
connection is exist ... and also there is an integer coloumn "event_id"
in table...
is it about the static method or what..? ..
Thanks..
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<br>
<br>
<pre class="moz-signature" cols="72">--
João Paulo Ribeiro | Senior Software Engineer
<a class="moz-txt-link-abbreviated" href="mailto:jp(at)mobicomp(dot)com">jp(at)mobicomp(dot)com</a>
PHONE: + 351 253 305 250
FAX : + 351 253 305 250
<a class="moz-txt-link-abbreviated" href="http://www.mobicomp.com">www.mobicomp.com</a>
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