GetParameter() null value

Hi all,
We are having a problem using the request.getParameter(String) method. We are using the method to define an argument for a Java Webstart (jnlp mime type) file we are creating with jsp. Other arguments have been successfully created using the request.getServerName() and request.getRequestURI() methods. The getParameter() return value looks fine if printed back to HTML. The jsp file creating the jnlp file is called using an HREF created inside another jsp file as follows:
<a href="xmlfetch.jsp?filename=mti.xml""></a>
The param value for filename in each HREF is filled using an String array entry (i.e. +names).
The xmlfetch.jsp file uses StringBuffers to capture/store the servername, uri and param data as follows:
StringBuffer svrname = new StringBuffer();
svrname.append(request.getServerName());
StringBuffer requri = new StringBuffer();
requri.append(request.getRequestURI());
StringBuffer fname = new StringBuffer();
fname.append(request.getParameter("filename"));
All 3 variables look ok if dumped in html as follows:
out.println("svrname=" +svrname);
out.println("requri=" +requri);
out.println("fname=" +fname);
But only the param value is null when the variables are passed as arguments in the jnlp stream as follows:
<argument><%=svrname.toString()%></argument>
<argument><%=requri.toString()%></argument>
<argument><%=fname.toString()%></argument>
So the question is ... why do the parameter values evaluate to non null when dumped to html but become null when used as an argument for jnlp? AND what is the difference between the strings returned by the 3 request methods we are using as arguments (i.e. why do 2/3 work?).
ANY HELP APPRECIATED:)
Greg Hock
Software Engr
Northrop Grumman Corp.
(321) 726-7758
[email protected]

I have tried the parameter specification both with and without quotes but either case results in null value for argument going into the Java Webstart (.jnlp) file that I create in the second jsp file (xmlfetch.jsp). What I don't understand is why the parameter looks correct when sent out.println() but is null when not printed and only used for the jnlp app argument. Both the other variables assigned using request.getXXX() methods are ok as arguments...only the parameters passed from the first jsp page (mtiquery.jsp) to the second jsp page (xmlfetch.jsp) become null when used as the jnlp argument.
Anyone ... please help. :)
Here is the code for the first jsp page. This page creates a table of filenames each of which has a href link to the second jsp page and passes it's filename as the parameter.
<%@ page
language="java"
import="java.util.*,java.text.*,java.io.*,javax.swing.filechooser.FileFilter"
%>
<html>
<title>MTIX MTI Query Tool</title>
<body>
<p>
<center>
<h1>JSP MTI QueryTest</h1><br>
<jsp:include page="copyright.jsp" flush="true"/>
<br>
<%=(new java.util.Date())%>
<%
String startPath = "../webapps/ATServlets/data/mti";
File myDir = new File(startPath);
String myPath = myDir.getCanonicalPath();
out.println("<br><br><br>Results of Query Path: <br>" myPath "<br><br>");
String[] filelist = myDir.list();
out.println("<br>");
out.println("<center>");
out.println("<table BORDER COLS=1 width=400>");
String urlPath = null;
String hrefPath = null;
for (int i=0; i<filelist.length; i++)
urlPath = new String("\"http://judy:8080/ATServlets/jsp/xmlfetch.jsp?filename="+filelist[i]+ "\"");
hrefPath = new String("<a href=" urlPath ">");
out.println("<tr><td><center>");
out.println(hrefPath + filelist[i] + "</a>");
out.println("</center></td></tr>");
out.println("</table>");
out.println("</center>");
%>
</center>
</body>
</html>
This first page resulted in source as follows:
NOTICE that the second jsp page is the HREF and I am using "filename" as the parameter key and the value is assigned (without quotes) to be the filelist entry.
<html>
<title>MTIX MTI Query Tool</title>
<body>
<p>
<center>
<h1>JSP MTI QueryTest</h1><br>
<html>
<head>
<title></title>
</head>
<body>
<p>(c) 1999,2000,2001 Northrop-Grumman All Rights Reserved </p>
</body>
</html>
<br>
Wed Aug 08 10:01:34 EDT 2001
<br><br><br>Results of Query Path: <br>/opt/mtix/data/mti<br><br>
<br>
<center>
<table BORDER COLS=1 width=400>
<tr><td><center>
MtiOutput.xml
</center></td></tr>
<tr><td><center>
KoreaMTI.xml
</center></td></tr>
<tr><td><center>
testMti.xml
</center></td></tr>
<tr><td><center>
testMti2.xml
</center></td></tr>
<tr><td><center>
testMti4.xml
</center></td></tr>
</table>
</center>
</center>
</body>
</html>
OK Now here is the second jsp file (xmlfetch.jsp) that is fired up after the table selection. This file creates a stream to the Java Webstart plugin and tries to use the passed parameter as 1 of 3 arguments to the application (see last few lines). The variable fname is used to hold the contents of the getParameter() method.
<%@ page
contentType="application/x-java-jnlp-file"
info="myjnlp"
import="java.lang.*,java.text.*,java.io.*"
%>
<%
StringBuffer fname = new StringBuffer();
fname.append(request.getParameter("filename"));
//fname.append("MtiOutput.xml");
//out.println("the fname var = " +fname);
StringBuffer cBase = new StringBuffer();
cBase.append(!request.isSecure() ? "http://" : "https://");
cBase.append(request.getServerName());
if(request.getServerPort() != (request.isSecure() ? 80 : 443))
cBase.append(':');
cBase.append(request.getServerPort());
StringBuffer httpref = new StringBuffer();
httpref = cBase;
httpref.append(request.getRequestURI());
StringBuffer cBase2 = new StringBuffer();
cBase2.append(!request.isSecure() ? "http://" : "https://");
cBase2.append(request.getServerName());
if(request.getServerPort() != (request.isSecure() ? 80 : 443))
cBase2.append(':');
cBase2.append("80");
cBase2.append('/');
cBase2.append("ATJava");
cBase2.append('/');
%>
<?xml version="1.0" encoding="utf-8"?>

<jnlp
spec="1.0"
codebase="<%=cBase2.toString()%>"
href="<%=httpref.toString()%>">
<information>
<title>Catalog Download Application</title>
<vendor>Northrop Grumman, Inc.</vendor>
<homepage href="ATJava.init/documents/index.html"/>
<description>XML Catalog Download Application>
<description kind="short">A demo.</description>
<icon href="ATJava.init/images/tomcat.gif"/>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.2" initial-heap-size="16m" max-heap-size="512m"/>
<jar href="ATJava.build/ATJava.jars/ATSignedRuntime.jar" download="eager"/>
</resources>
<resources>
<j2se version="1.3" initial-heap-size="16m" max-heap-size="512m"/>
<jar href="ATJava.build/ATJava.jars/ATSignedRuntime.jar" download="eager"/>
</resources>
<application-desc main-class="mtix.XMLFetch">
<argument><%=fname.toString()%></argument>
<argument><%=cBase2.toString()%></argument>
<argument><%=httpref.toString()%></argument>
</application-desc>
</jnlp>
Please HELP/COMMENT if you can.... Gregg

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                         str1 = disp(rs.getString(10),keywords[i]);
                         if(!str1.equals(" ") || !str1.equals(""))
                              out.println("<tr><td width=150><font color = green face=\"verdana, geneva, arial, sans-serif\" size=2><b>Fax</td><td><font face=\"verdana, geneva, arial, sans-serif\" size=2>"+str1+"</td></tr>");
                         str1 = disp(rs.getString(11),keywords[i]).toLowerCase();
                         if(!str1.equals(" ") || !str1.equals(""))
                              out.println("<tr><td width=150><font color = green face=\"verdana, geneva, arial, sans-serif\" size=2><b>eMail</td><td><font face=\"verdana, geneva, arial, sans-serif\" size=2>"+str1+"</td></tr>");
                         str1 = disp(rs.getString(12),keywords[i]).toLowerCase();
                         if(str1.equals("null") || str1.equals(" ") || str1.equals(null))
                              str1="";
                         else
                              out.println("<tr><td width=150><font color = green face=\"verdana, geneva, arial, sans-serif\" size=2><b>Web Site</td><td><font face=\"verdana, geneva, arial, sans-serif\" size=2>"+str1+"</td></tr>");
                         str1 = disp((rs.getString(13)).replace(',',' '),keywords[i]);
                         if(str1 == "null" || str1 == null || str1 == "")
                         //if(!rs.wasNull())
                              out.println("nothing");
                         else
                              out.println("<tr><td width=150><font color = green face=\"verdana, geneva, arial, sans-serif\" size=2><b>Key Words</td><td><font face=\"verdana, geneva, arial, sans-serif\" size=2>"+str1+"</td></tr>");
                         out.println("<tr><td width=150><hr></td><td><hr></td></tr>");
                         out.println("</table><br>");
               } // end while
               } // end if
               catch(Exception e)
                    System.out.println("Exception while executing query: "+ e);
          } // end for
          if(!found)
               out.println("<center><font color=#ff9999 face=\"verdana, geneva, arial, sans-serif\" size=2><b>Searched for \""+ key+"\", ");
               out.println("Total Matches found : 0</center><br>");
          out.println("<center><a href=\"javascript:myclose()\"><font color=red face=\"verdana, geneva, arial, sans-serif\" size=2>Close</a></center>");
          out.println("</body></html>");
     public void doGet(HttpServletRequest req, HttpServletResponse res)
     throws IOException,ServletException
          doPost(req,res);
     public String disp(String str1, String str2)
          int i,j,k;
          boolean found=false;
          String s1,s2,s3;
          String t1,t2;
          t1 = initCap(str1);
          s1 = t1.toLowerCase();
          s2 = str2.toLowerCase();
          for(i=0;i<s1.length() && !found ;i++)
               k=i;
               for(j=0;j<s2.length() && k < s1.length() && s1.charAt(k) == s2.charAt(j) ;j++,k++);
               if(j==s2.length())
                    found=true;
          if(found)
               i--;
               s3 = t1.substring(0,i);
               s3 += "<font color=blue face=\"verdana, geneva, arial, sans-serif\" size=2><b>";
               s3 += t1.substring(i,i+str2.length());
               s3 += "</font></b>";
               s3 += t1.substring(i+str2.length(),t1.length());
          else
               s3 = t1;
          return s3;
     public String initCap(String str)
          StringTokenizer st = new StringTokenizer(str," ");
          String s1="";
          String s2="";
          String s3="";
          String s4="";
          while(st.hasMoreElements())
               s1 = (String)st.nextElement();
               if(s1.length() > 0)
                    s2 = s1.substring(0,1);
                    s2 = s2.toUpperCase();
               if(s1.length() > 1)
                    s3 = s1.substring(1,s1.length());
               s2 += s3;
               s4 +=" "+s2;
          return s4;

Null values in Weblogic 7 HTTP Request Parameters

It appears weblogic 7 handles nulls passed from the request object
          differently than the previous versions. In my jsp's, if a parameter
          was not passed, I used to get a java null value:
          String s = request.getParameter("something_not_passed");
          if(s == null) {
          //do stuff
          Now, weblogic seems to return the string literal "null" so I would
          have to use:
          if(s.equals("null")) {
          //do stuff
          Is this a bug or am I missing something?
          Thanks,
          Paul


HI, Thanks for the reply. I am using getString() to fetch values.
DO u think its due to driver incompatibility?? Because, BEA claims WL7.0 supports
Oracle 8.1.7 onwards!
Thanks,
Yogesh
Joseph Weinstein <[email protected]> wrote:
>
>
Yogesh wrote:
Hi, I have ported my web application from weblogic 5.1 to weblogic 7.Set up is weblogic
7 with database Oracle 8.1.6 and i am using OCI driver for DB connectionpool. I
am facing some problems like, the values that were retrieved as blanksin weblogic
5.1 are being retrieved as null(string literal value) in 7. The same thinghappens
when parameters were passed through HTTP request object. Any idea aboutthis?
Thanks,
YogeshHi. This sounds like a driver bug. Let's isolate it to a simple standalone
program
that uses our driver to select null data. How are you asking for the object?
GetString(),
GetObject()?
Joe

Null values returned when using request.getParameters(

I have a html form which allows the user to choose options and select a file to upload. When I use method=Post I get null values returned. When I use method=Get I get my parameter values fine.. but I get an error.
"Posted content type isn't multipart/form-data"
I would like to know why I am getting null values returned when using Post. I am using the following to get the values from the name=value passed to the servlet.
String strIndustry = request.getParameter("frmIndustry");
String strCompany = request.getParameter("frmCompany");
String strCollabType = request.getParameter("frmCollaboration");
I have another form where the user can search information in a database that works just fine w/ either Get or Post
Or perhaps I am using oreilly MultipartRequest incorrectly??? but I copied it directly from another discussion.. ???
any thoughts
Thanks

taybon:
you could do it like this. in this case, you submit your form with the parameters (industry, company, collaboration), and upload your file at the same time. and in the target servlet, you can build your MultipartRequest object like this:
MultipartRequest multi = new MultipartRequest(request, temp_location, 50 * 1024);where variable temp_location stands for a temporatory diretory for file uploading.
and then you get your parameters, so you can build the directory with them. and after that, you can move your file to that directory using File.renameTo();
but as i've suggested in my previous posting, i just recommend you upload your file in a separate form. and then you can perform an oridianry doPost form submit with those parameters. or you may have problems with the file uploading. (this is just my personal experiences with Multipart).
there is one other thing i'd like to mention, file.renameTo() won't work if you need to move files to a network drive in windows. it won't work if you move files across file systems in unix.
Song xiaofei
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

Servlet only gets null values from mobile

OK, i'm doing a project for college which involves inputting data into an application on a mobile device, sending them to a servlet and updating a database. I've got my mobile app working and sending but the servlet is only receiving null values for it. I'll post the code for d servlet and see if anyone can figure out whats wrong. The problem might not even be the servlet so i'll post part of the mobile app as well. The problem could well be when i'm buffering the content on the mobile to a string. Anyway, any help appreciated, thanks.
The Servletimport java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.logging.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ThisServlet extends HttpServlet
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>ThisServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        String connectionURL = "jdbc:mysql://localhost:3306/database";
        Connection connection = null;
        Statement stmt = null;
        ResultSet rs = null;
        res.setContentType("text/html");
        PrintWriter out = res.getWriter();
        String MobileNumber = req.getParameter("user");
        String field1 = req.getParameter("h1");
        String field2 = req.getParameter("h2");
        String field3 = req.getParameter("h3");
        try {
            // Load the database driver
            Class.forName("com.mysql.jdbc.Driver");
            // Get a Connection to the database
            connection = DriverManager.getConnection(connectionURL, "root", "root");
            try {
                stmt = connection.createStatement();
            } catch (SQLException ex) {
                Logger.getLogger(ThisServlet.class.getName()).log(Level.SEVERE, null, ex);
            rs = stmt.executeQuery("SELECT UserID FROM User WHERE MobileNumber = '" + MobileNumber + "'");
            while (rs.next()) {
                String UserID = rs.getString("UserID");
                String insert = "INSERT INTO newTable(UserID, One, Two, Three) VALUES (?,?,?,?)";
                PreparedStatement pst = connection.prepareStatement(insert);
                pst.setString(1, UserID);
                pst.setString(2, field1);
                pst.setString(3, field2);
                pst.setString(4, field3);
                pst.executeUpdate();
                pst.close();
        catch(ClassNotFoundException e){
            System.out.println(e.toString());
        catch(SQLException e){
            System.out.println(e.toString());
        catch (Exception e){
            System.out.println(e.toString());
        finally {
            // Always close the database connection.
            try {
                if (connection != null) connection.close();
                System.out.print("closing db connection ... \n");
            catch (SQLException ignored){
                out.println(ignored);
    @Override
    public String getServletInfo() {
        return "Short description";
}The Mobile App (only part where putting the content together to send)
buffer.append("user="+mobileNumber).append("?h1="+field1)
                    .append("?h2="+field2).append("?h3="+field3);
            content = buffer.toString();
sendToServer(url, content);

For sure you would have to do following on your mobile:
buffer.append("?user="+mobileNumber).append("&h1="+field1)
                    .append("&h2="+field2).append("&h3="+field3);
            content = buffer.toString();
sendToServer(url, content);'?' - is a delimiter of GET parameters and '&' - is a delimiter between GET parameters
Edited by: ivanovpv on 30.04.2009 10:57

Problem in sending drop down list value to jsp page showing null value

i am trying to send a drop down list value from client side to a jsp page but getting null value
this is first page where i have accessed data from database and putted it in a drop down list
<select name="sub">
     <%
     while(rs2.next())
     cat=rs2.getString(1);
     %><option value="<%=cat%>"><%=cat%></option><%
     }%></select>
<input type="submit" value="Go"></input>
now on submit i am going to another page
where i want the selected value from drop down list to be printed
i have used there
<%
String subject= request.getParameter( "sub.value" );
out.println(subject);
%>
but it is printing null here what is the problem that i m facing
thanx & reagrds
sweety

how to generate dynamically names for text boxes
i am generating text boxes in while loop when selecting data from database
while(rs1.next())
name=rs1.getString(1);%>
<tr>
<td>1</td>
<td><%out.println(name);
//i am printing here stud_id a unique key and want to update records from following text boxes to particular stud_id
%></td>
<td><input type="text" name="????"></input></td>
<td><input type="text" name="????"></input></td>
<td><input type="text" name="????"></input></td>
<td><input type="text" name="????"></input></td>
</tr><%
the structure is like
stud_id | attended theory | conducted theory | ateended practical | conducted practical
where attended theory, conducted theory............. are to be inputed manually for all students and then update in database
so i am facing problem in generating names for textboxes how to do that
so that those can be updated in database for particular student
Thanx & Regards
sweety

Binding for "File Content Repository Path" is returning null value

I have created a data control for file based content repository based on an existing file system path. *But when this data contol is invoked the command "#{bindings['getURI_returnURI'].inputValue}" is returning null.*+
Please advice what are possible scenarios. I have performed the following
#1. Create a file system folder in windows XP named "C:\CPContentRepository" and add some html pages into this folder.
#2. Create a "content" project in the application.
#3. Create a "Content Repository Data Control" named "CPFileContentRepository". Repository Type : "File System", Base Path : "C:\CPContentRepository". Test & Registration is successful.
#4. Add a "panel horizontal" into jsf jsp "ContentTest" page & drap-dop data control "CPFileContentRepository--> getURI(String)--> Return--> URI". select return type as "ADF Output Text".
#5. Edit Authorization of the "ContentTest" page definition for "View --> anyone".
#6. Edit Authorization of the "ContentTest" page definition bindings "getURI" for "Invoke --> anyone".
#7. Run the "ContentTest" page. The output for the page is empty.
Regards,
Vikki

There're two major problems in your code. One you have used different names to get your parameters like in your first jsp they're like
<input type="text" name="did" size="20" </p>
<p align="center"> </p>
<p align="center"><b>Name        </b>
<input type="text" name="name" size="20"></p>
<p align="center"> </p>
<p align="center"><b>Specialist In
<input type="text" name="specialist" size="20"></b></p>
<p align="center"> </p>
<p align="center"><b>Address
<input type="text" name="address" size="20"></b></p>
<p align="center"> </p>
<p align="center"><b>Phone no.
<input type="text" name="phno" size="20"></b></p>
<p align="center"> </p>but when you're getting you're doing it like this
String name = request.getParameter("name");
     String did = request.getString("did");
     String add = request.getParameter("add");
     String specilist = request.getParameter("specilist");
     String phno = request.getParameter("phno");First get them with same name as you have them in your first jsp. another thing in that you're not used form tag in write way... You have created submit button in some other form
and when you're pressing submit button actully you're submitting only that form value and your form1 is not submitted that's why you're getting null values for
those parameters you're getting with right name

Problem when passing string array in sessions showing null value

i am trying to pass a string array but it is showing me the null value
i think the the problem is seem to be in session.settAttribute("subject['"+i+"']",subject) in 2.login_action.jsp
or in String sub1=(String) session.getAttribute("subject[0]"); in 3.user_home.jsp
i have following three pages
1.login.html
2.login_action.jsp
3.user_home.html
1.login.html
<html>
<body>
<form method="post" action="login_action.jsp">
Username<input type="text" name="username"></input>
<br>
Password<input type="password" name="password"></input>
<input type="submit" value="login"></input>
</form>
</body>
</html>
2.login_action.jsp
<%@ page contentType="text/html"%>
<%@ page import="java.sql.*" %>
<%!
String user,pwd;
String subject[]=new String[10];
int i,totalsubject;
%>
<%
try
user=request.getParameter("username");
pwd=request.getParameter("password");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:ods","scott","tiger");
PreparedStatement ps = con.prepareStatement("select password from users where username='"+user+"'");
ResultSet rs = ps.executeQuery();
if(rs.next())
if(rs.getString("password").equals(pwd))
session.setAttribute("username",user);
PreparedStatement ps2 = con.prepareStatement("select subject_id from allot_teachers where staff_id='"+user+"'");
                    ResultSet rs2 = ps2.executeQuery();
                         while(rs2.next())
                         i=0;
                         subject[i]=rs2.getString(1);
// if i display here the subjects in out.println(subject[i]) it is working fine
// but in next redirected page it is showing null
                         session.setAttribute("subject['"+i+"']",subject[i]);
                         //out.println(subject[i]);
                         i++;
response.sendRedirect("user_home.jsp");
else
out.println("error invalid username or password");
else
out.println("error invalid username or password");
con.close();
catch(Exception e)
out.println(e);
%>
3. user_home.jsp
<%@ page contentType="text/html"%>
<%@ page import="java.sql.*" %>
<html>
<%
String user,pwd,cat,cat1;
String username=(String) session.getAttribute("username");
if(username==null)
response.sendRedirect("login.html");
//just tried for first two subjects
String sub1=(String) session.getAttribute("subject[0]");
String sub2=(String) session.getAttribute("subject[1]");
//here it is printing null
out.println(sub1);
//here it is printing null
out.println(sub2);
%>
<form method="post" action="logout.jsp">
<input type="submit" value="Logout"></input>
</form>
</html>
Cheers & Regards
sweety

The name in getAttributre doesnt match the name in setAttribute.
Note "subject[0]" is a string containing 10 chars, "subject" is a string containing 7 chars.
Here is your code:
session.setAttribute("subject",subject);
String sub1=(String) session.getAttribute("subject[0]");

JDBC MS Access--- cannot extract entry with null value with data type Meta

I'm trying to extract a data entry with null value by using JDBC. The database is MS Access.
The question is how to extract null entry with data type memo? The following code works when the label has data type Text, but it throws sqlException when the data type is memo.
Any advice will be appreciated! thanks!
Following are the table description and JDBC code:
test table has the following attributes:
Field name Data Type
name Text
label Memo
table contents:
name label
me null
you gates
Code:
String query = "SELECT name, label FROM test where name like 'me' ";
ResultSet rs = stmt.executeQuery(query);
while (rs.next())
String name = rs.getString("name");
rs.getString("val");
String label = rs.getString("label");
System.out.println("\t"+name+"\t"+label);
catch (SQLException ex)
System.out.println(ex.getSQLState());
System.out.println(ex.getErrorCode());
System.out.println("in sqlexception");
output:
C:\Temp\SEFormExtractor>java DBTest
yet SELECT name, label FROM test
null
0
in sqlexception

The question is how to extract null entry with data type memo?Okay, what you need to do is this:
if (rs.getString("val") == null)
// do something
}This way, when it's a null value, you can check it first, and then handle it how you want, rather than getting an exception.

Index (or not) for excluding NULL values in a query

Hello,
I have table that can become very large. The table has a varchar2 column (let's call it TEXT) that can contain NULL values. I want to process only the records that have a value (NOT NULL). Also, the table is continuously expanded with newly inserted records. The inserts should suffer as little performance loss as possible.
My question: should I use an index on the column and if so, what kind of index?
I have done a little test with a function based index (inspired by this Tom Kyte article: http://tkyte.blogspot.com/2006/01/something-about-nothing.html):
create index text_isnull_idx on my_table(text,0);
I notice that if I use the clause WHERE TEXT IS NULL, the index is used. But if I use a clause WHERE TEXT IS NOT NULL (which is the clause I want to use), a full table scan is performed. Is this bad? Can I somehow improve the speed of this selection?
Thanks in advance,
Frans

I build a test case with very simple table with 2 columns and it shows that FTS is better than index access even when above ratio is <= 0.01 (1%):
DROP TABLE T1;
CREATE TABLE T1
           C1 VARCHAR2(100)
          ,C2 NUMBER
INSERT INTO T1 (SELECT TO_CHAR(OBJECT_ID), ROWNUM FROM USER_OBJECTS);
BEGIN
     FOR I IN 1..100 LOOP
          INSERT INTO T1 (SELECT NULL, ROWNUM FROM USER_OBJECTS);
     END LOOP;
END;
CREATE INDEX T1_IDX ON T1(C1);
ANALYZE TABLE T1 COMPUTE STATISTICS
     FOR TABLE
     FOR ALL INDEXES
     FOR ALL INDEXED COLUMNS
SET AUTOTRACE TRACEONLY
SELECT
          C1, C2
     FROM T1 WHERE C1 IS NOT NULL;
3864 rows selected.
real: 1344
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=59 Card=3864 Bytes=30912)
   1    0   TABLE ACCESS (FULL) OF 'T1' (Cost=59 Card=3864 Bytes=30912)
Statistics
          0 recursive calls
          0 db block gets
       2527 consistent gets
       3864 rows processed
BUT
SELECT
     --+ FIRST_ROWS
          C1, C2
     FROM T1 WHERE C1 IS NOT NULL;
3864 rows selected.
real: 1296
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=35 Card=3864 Bytes=30912)
   1    0   TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=35 Card=3864 Bytes=30912)
   2    1     INDEX (FULL SCAN) OF 'T1_IDX' (NON-UNIQUE) (Cost=11 Card=3864)
Statistics
          0 recursive calls
          0 db block gets
       5052 consistent gets
       3864 rows processed
and just for comparison:
SELECT * FROM T1 WHERE C1 IS NULL;
386501 rows selected.
real: 117878
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=59 Card=386501 Bytes=3092008)
   1    0   TABLE ACCESS (FULL) OF 'T1' (Cost=59 Card=386501 Bytes=3092008)
Statistics
          0 recursive calls
          0 db block gets
     193850 consistent gets
     386501 rows processedHence you have to benchmark you queries with and w/o index[es]

How to validate if a column have NULL value, dont show a row with MDX

Hello,
I have this situation, I have a Result from MDX that return rows with values NULL on columns, I tried with NON EMPTY and NONEMPTY but the result is the same. That I want to do is validate if a column have a Null value discard the row, but I dont know how
to implement it, could somebody help me?, please.
Thanks a lot.
Sukey Nakasima
Sukey Nakasima

Hello,
I found the answer in this link https://social.technet.microsoft.com/Forums/sqlserver/en-US/f9c02ce3-96b2-4cd6-921f-3679eb22d790/dont-want-to-cross-join-with-null-values-in-mdx?forum=sqlanalysisservices
Thanks a lot.
Sukey Nakasima
Sukey Nakasima

GetParameter() null value

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