SQL: inserting new rows using ResultSet

Question

Hi,
I have the following question - how does one properly insert rows into a database table, using an updatable ResultSet? There doesn't seem to be much to it, but the following code/result has me puzzled:
1. My MS SQL table:
create table dogs
age integer
2. Java code
public class TestSQL {
public static void main (String args[]) {
try{
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String url = "jdbc:odbc:bolit";
String usr = "bolit";
String pwd = "bolit";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(url, usr, pwd);
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
rs = stmt.executeQuery("Select * from dogs");
rs.moveToInsertRow();
rs.updateInt("age",10);
rs.insertRow();
} catch(Exception e) {
System.out.println("TestSQL.main: "+e);
3. Resulting exception:
TestSQL.main: java.lang.NullPointerException
I would have maybe expected some SQL exception, but this I don't understand...
I'm in advance very grateful for any assistance.
By the way, how can one format code in posts?

Answer 1

to format posts, see:
http://forum.java.sun.com/faq.jsp#messageformat
I'd try putting in some printouts to see what's null:Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(url, usr, pwd);
//PRINT OUT "con" HERE
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
//PRINT OUT "stmt" HERE
rs = stmt.executeQuery("Select * from dogs");
//PRINT OUT "rs" HERE
rs.moveToInsertRow(); My guess is that your url is incorrect, so con is null, but I'm not a betting man, so I won't put any money on it ;-).