How to update the null values to some number on the NUMBER type of column

Hello All,
I have one NUMBER type of column in DB table. It has some (null) values. I want to update with value 1. I tried to run the Update statement , It gives 0 rows updated.
SELECT objectid,attr20 FROM table;
object id attr20
====== ====
fff70b67-8d54-4ad7-bc57-7b40a0d8b219     (null)
cac5264a-b363-487b-bfe6-6b84d60064e9     (null)
2fc2a626-51d8-401c-9495-18aacd4c35c8     (null)
1b60bfa4-ff68-4488-adf6-2a83528c0e20     (null)
1c662829-24c1-4b3c-9289-0128e170c043     5
74f11331-545b-435f-bf4b-f57c7a6b4500     2
c941c1ac-a18e-47ec-843c-dbe2a5b51001     0
d7eba203-93c0-48ea-a109-9b06015ef387     0
eba72fa3-21d8-4489-bb93-917ebbd67de2     0
I ran following query but no success.
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = NULL
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = null
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = ''
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 =' '
Error starting at line 1 in command:
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 =' '
Error report:
SQL Error: ORA-01722: invalid number
01722. 00000 - "invalid number"
*Cause:
*Action:
can some one help me out to update such values ????

Hi,
"=" will not work for NULL values. Please remeber two NULL values are NOT same. Try IS operator.
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 IS NULLRegards,
Avinash

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 int i,j,k;
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 if(s1.length() > 1)
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public void actionPerformed(ActionEvent e) {
jButton2_actionPerformed(e);
contentPane.add(jButton2, new XYConstraints(126, 113, -1, -1));
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
void jButton2_actionPerformed(ActionEvent e) {
try{
OutputStream out;
XMLOutputter outputter;
Element root;
org.jdom.Document doc;
root = new Element("PINFO");
String query = "SELECT * FROM PINFO WHERE PID=2 OR PID=4";
ResultSet rs = stmt.executeQuery(query);
/*===========This is where i am passing the ResultSet and boolean=======
===========value to either add the null or not null values in the file======*/
rstx = new ResultSetToXML(rs,true);
} //end of try
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
======================================================================================
ResultSetToXML class
====================
public class ResultSetToXML {
private OutputStream out;
private Element root;
private XMLOutputter outputter;
private Document doc;
// Constructor
public ResultSetToXML(ResultSet rs, boolean checkifnull){
try{
String tagname="";
String tagvalue="";
root = new Element("pinfo");
while (rs.next()){
Element users = new Element("Record");
for(int i=1;i<=rs.getMetaData().getColumnCount(); ++i){
tagname= rs.getMetaData().getColumnName(i);
tagvalue=rs.getString(i);
System.out.println(tagname);
System.out.println(tagvalue);
/*============if the boolean value is false it adds the null and not
null value to the file =====================*/
/*============else it checks if the value is null or the length is
less than 0 and does the else clause in the if(checkifnull)===*/
if(checkifnull){
if((tagvalue == null) || tagvalue.length() < 0 ){
users.addContent((new Element(tagname).setText(tagvalue)));
else{
users.addContent((new Element(tagname).setText(tagvalue)));
else{
users.addContent((new Element(tagname).setText(tagvalue)));
root.addContent(users);
out=new FileOutputStream("c:/XMLFile.xml");
doc = new Document(root);
outputter = new XMLOutputter();
outputter.output(doc,out);
catch(IOException ioe){
System.out.println(ioe);
catch(SQLException sqle){

Can someone please help me with this problem
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