How do I handle NULL returns from prepared statement?

Thanks in advance to all those who respond. As a beginner with Java/JSP/JDBC, I need all the help I can get!
Here's the problem...
I'm using a prepared statement in JSP to query a MySQL database.
If there is a value to return, everything works properly.
If the query returns a NULL (empty set) value, I get the following error:
javax.servlet.ServletException: Before start of result set
Here's the code (no negative comments please...I know I'm violating some conventions! I'll restructure it later. Right now I just need help with handling the NULL case):
<%
Driver DriverAppt = (Driver)Class.forName(MM_test_DRIVER).newInstance();
Connection ConnAppt = DriverManager.getConnection(MM_test_STRING,MM_test_USERNAME,MM_test_PASSWORD);PreparedStatement StatementAppt = ConnAppt.prepareStatement("SELECT lastname FROM appts_pid1 WHERE user_id = " + Recordset1__MMColParam + " AND year = " + yy + " AND month = '" + months[mm] + "' AND date = " + dates[dd] + " AND appttime = '16:15:00'");
ResultSet Appt = StatementAppt.executeQuery();
boolean Appt_isEmpty = !Appt.first();
boolean Appt_hasData = !Appt_isEmpty;
Object Appt_data;
int Appt_numRows = 0;
%>
Thanks for the help!!!

I think I have a better handle on what's occurring here. To cut to the heart of the problem, I'm going to give a very simple example that illustrates what type of error handling I need.
HERE'S THE EXAMPLE:
Let's say that I have a database of users. There are only two columns in the database: user_id and lastname. There are only 2 users, user_id "1" has lastname "Jones" and user_id "2" has lastname "Smith".
I built a very simple web interface that let's a user enter a number to see if there's a lastname associated with that record. The user has no way of knowing if the user_id exists or not, so they may or may not enter a valid number.
If the user enters a valid user_id (in this case "1" or "2"), then the correct lastname is displayed. If the user enters an invalid user_id (in this case, anything other than "1" or "2") then I get the same "Before start of result set" error that I'm getting in my real application.
So, the question is: WHERE IN THIS CODE WOULD I HANDLE THE RETURN OF AN EMPTY SET?
The goal here is to have the sentence say "The user's lastname is .", basically returning null. If there has to be a value, then have the last sentence say "The user's lastname is unknown."
If you can solve this simple example, you'll have also solved the problem with my main application!!!! :-)
Here's the example code:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ include file="Connections/example.jsp" %>
<%
String Recordset1__MMColParam = "1";
if (request.getParameter("user_id") !=null) {Recordset1__MMColParam = (String)request.getParameter("user_id");}
%>
<%
Driver DriverRecordset1 = (Driver)Class.forName(MM_example_DRIVER).newInstance();
Connection ConnRecordset1 = DriverManager.getConnection(MM_example_STRING,MM_example_USERNAME,MM_example_PASSWORD);
PreparedStatement StatementRecordset1 = ConnRecordset1.prepareStatement("SELECT * FROM test_table WHERE user_id = " + Recordset1__MMColParam + "");
ResultSet Recordset1 = StatementRecordset1.executeQuery();
boolean Recordset1_isEmpty = !Recordset1.next();
boolean Recordset1_hasData = !Recordset1_isEmpty;
Object Recordset1_data;
int Recordset1_numRows = 0;
%>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<form action="test.jsp" method="get" enctype="application/x-www-form-urlencoded" name="form1" target="_self">
<p> Submit a user id and a lastname will be displayed.</p>
<p>
<input type="text" name="user_id">
<input type="submit" name="" value="Submit">
</p>
</form>
<p>The User's lastname is <%=(((Recordset1_data = Recordset1.getObject("lastname"))==null || Recordset1.wasNull())?"":Recordset1_data)%>.</p>
</body>
</html>
<%
Recordset1.close();
StatementRecordset1.close();
ConnRecordset1.close();
%>
A huge "THANK YOU!!!!" to all those who've helped me here!!!

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          Walter Bodwell <[email protected]> wrote in message
          news:[email protected]...
          > The spec itself is not very clearly written, but seems to imply that
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          > Walter
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          > Andrew Robinson <[email protected]> wrote in message
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          > > news:[email protected]...
          > > > Doesn't getSession() just call getSession( true )? The descriptions
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          > > >
          > > > Thanks,
          > > > Walter
          > > >
          > > > Andrew Robinson <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > Try using getSession(), no arguments, it is in the 2.1 servlet spec
          > > > >
          > > > > Walter Bodwell <[email protected]> wrote in message
          > > > > news:[email protected]...
          > > > > > It is my understanding that when you call getSession on an
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          return
          > > > null.
          > > > > > Unfortunately, that is exactly what we are seeing. Has anybody
          else
          > > had
          > > > a
          > > > > > similar problem? We've seen it three times at this point. It
          only
          > > > seems
          > > > > to
          > > > > > happen after stress or extended usage of the WebLogic server
          > (several
          > > > > days).
          > > > > > After null is returned, it is always returned until you restart
          the
          > > > > server.
          > > > > >
          > > > > > We are running WebLogic 4.5.1 (service pack 2) with clustering and
          > > > > in-memory
          > > > > > replication of session data. We use jview (Microsoft's VM) on
          > Windows
          > > > NT
          > > > > > Server 4.0 (service pack 6).
          > > > > >
          > > > > > Thanks,
          > > > > > Walter Bodwell
          > > > > > Evity, Inc.
          > > > > >
          > > > > >
          > > > >
          > > > >
          > > >
          > > >
          > >
          > >
          >
          >

How to eliminate NULL values from case statement?

I have the following query where I am trying to eliminate the NULL record. How can I do this? My query:
select
AttendedSchoolLast3Months = case
when d.scrnval_id = 'AA5639E4-E60C-473F-9B72-354472C11F5B' and d.picklist_value = 'BC349A1E-65A1-4497-A38A-116C83B2028F' then 2 --No
when d.scrnval_id = 'AA5639E4-E60C-473F-9B72-354472C11F5B' and d.picklist_value = 'A529C643-60A7-4D79-AC67-1A8F70791934' then 1 --Yes
end
From [evolv_cs].[dbo].[test_header] [test_header_rv] WITH (NOLOCK)
CROSS APPLY [dbo].[fn_getTestSetupFormDetails](null, [test_header_rv].[test_setup_header_id]) AS [test_header]
CROSS APPLY [dbo].[fn_getTestSetupFormDetails]([test_header].[test_setup_details_id], null) AS [test_details]
JOIN [evolv_reports].[dbo].[test_details_answers_expanded_view] d WITH (NOLOCK) ON
[test_header_rv].[test_header_id] = d.[test_header_id]
AND [test_details].[test_setup_details_id] = d.[test_setup_details_id]
join [user_defined_lut_rv] udl1 with(nolock) on udl1.[user_defined_lut_id] = d.picklist_value
join people_rv p (nolock) on d.people_id = p.people_id
where d.actual_date between '9/1/13' and '9/30/13'
and d.people_id = '7A9ACEE4-ABD5-4905-A54E-659A81048A1A'
And the result currently is:
AttendedSchoolLast3Months
1
NULL
When I ran this query:
select distinct --attendedschoollast3months
d.*
From [evolv_cs].[dbo].[test_header] [test_header_rv] WITH (NOLOCK)
CROSS APPLY [dbo].[fn_getTestSetupFormDetails](null, [test_header_rv].[test_setup_header_id]) AS [test_header]
CROSS APPLY [dbo].[fn_getTestSetupFormDetails]([test_header].[test_setup_details_id], null) AS [test_details]
JOIN [evolv_reports].[dbo].[test_details_answers_expanded_view] d WITH (NOLOCK) ON
[test_header_rv].[test_header_id] = d.[test_header_id]
AND [test_details].[test_setup_details_id] = d.[test_setup_details_id]
join [user_defined_lut_rv] udl1 with(nolock) on udl1.[user_defined_lut_id] = d.picklist_value
--join [education_level] e (nolock) on e.[EducationLevel] = udl1.[description]
join people_rv p (nolock) on d.people_id = p.people_id
where d.actual_date between '9/1/13' and '9/30/13'
and d.people_id = '7A9ACEE4-ABD5-4905-A54E-659A81048A1A'
I get this:
event_log_id people_id group_profile_id actual_date test_header_id test_setup_details_id test_domains_info_id question_caption question_code test_details_answers_id update_log_id test_details_id numeric_value scrnval_id picklist_value remarks narrative test_setup_details_answers_id is_checked date_value details_type_code test_setup_answers_caption test_setup_answers_order test_setup_answers_value output_code answers_category_id answers_category answers_category_code
24E8F88F-9648-4714-9394-D5A3F642C0F0 7A9ACEE4-ABD5-4905-A54E-659A81048A1A NULL 2013-09-26 17:00:00.000 24E8F88F-9648-4714-9394-D5A3F642C0F0 67CDCF44-6308-4E15-8543-3C85DE4C6D4D NULL Attended school in the last 3 months NULL 1BB75044-A65C-4464-ADB9-0CA991019907 7CDD1A4F-41F4-403C-A85E-7FF51B761FF0 3F04BBFF-8DE9-4283-842F-E53A536E3E46 NULL AA5639E4-E60C-473F-9B72-354472C11F5B A529C643-60A7-4D79-AC67-1A8F70791934 NULL NULL 5979600C-B4E6-42DF-BF45-8AFF15ACDD7D 0 NULL PICKLIST Click here for list 1 NULL NULL NULL NULL NULL
24E8F88F-9648-4714-9394-D5A3F642C0F0 7A9ACEE4-ABD5-4905-A54E-659A81048A1A NULL 2013-09-26 17:00:00.000 24E8F88F-9648-4714-9394-D5A3F642C0F0 EBDFBCA5-6E57-4907-9DEF-A1E118F3AB2D NULL Highest grade completed NULL 8F7F4644-4E67-4821-B0FC-A192389F994D 7CDD1A4F-41F4-403C-A85E-7FF51B761FF0 F6C59E67-EC74-4F0C-8EE8-AB372F22255D NULL 4536DD06-871D-4FA7-BA8A-552DB2CA59BC D77F0CAB-505E-4838-AECE-01BAAE8B8EB2 NULL NULL E7C9ECB7-7B40-4115-A6DB-BC752116D68D 0 NULL PICKLIST Click here for list 1 NULL NULL NULL NULL NULL
Ryan D

Hi,
what I understood from above is that u want to filter NULL records and want to display only not null records. Try below query.
SELECT * FROM(select
AttendedSchoolLast3Months = case
when d.scrnval_id = 'AA5639E4-E60C-473F-9B72-354472C11F5B' and d.picklist_value = 'BC349A1E-65A1-4497-A38A-116C83B2028F' then 2 --No
when d.scrnval_id = 'AA5639E4-E60C-473F-9B72-354472C11F5B' and d.picklist_value = 'A529C643-60A7-4D79-AC67-1A8F70791934' then 1 --Yes
end
From [evolv_cs].[dbo].[test_header] [test_header_rv] WITH (NOLOCK)
CROSS APPLY [dbo].[fn_getTestSetupFormDetails](null, [test_header_rv].[test_setup_header_id]) AS [test_header]
CROSS APPLY [dbo].[fn_getTestSetupFormDetails]([test_header].[test_setup_details_id], null) AS [test_details]
JOIN [evolv_reports].[dbo].[test_details_answers_expanded_view] d WITH (NOLOCK) ON
[test_header_rv].[test_header_id] = d.[test_header_id]
AND [test_details].[test_setup_details_id] = d.[test_setup_details_id]
join [user_defined_lut_rv] udl1 with(nolock) on udl1.[user_defined_lut_id] = d.picklist_value
join people_rv p (nolock) on d.people_id = p.people_id
where d.actual_date between '9/1/13' and '9/30/13'
and d.people_id = '7A9ACEE4-ABD5-4905-A54E-659A81048A1A' ) AWHERE AttendedSchoolLast3Months IS NOT NULLTry this query.
Thanks Shiven:) If Answer is Helpful, Please Vote

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