JTable which recieves ResultSet as a parameter

Hi,
I am a .Net Framework originated developer which now learning Java.
I want to develop a ResultSet taking class to show data on the JFrame, to achieve this, I extend JTable, wrote a new constructor to take ResultSet then transfer its rows and column names to a two-dimensinal and a one dimensional array then add as columns to JTable. But I am unable to find a method for late adding columns to JFrame....
The code fallows...
Any ideas??
class BSTablo extends JTable {
     ResultSet rs;
     String [] isimler;
     String[][] datalar;
     void BSTablo(ResultSet recSet) {
          rs = recSet;
          try {
               ResultSetMetaData rsmd = rs.getMetaData();
               int sutsayi = rsmd.getColumnCount();
               rs.last();
               int satsayi = rs.getRow();           rs.beforeFirst();
               isimler = new String[sutsayi];
               datalar = new String[satsayi][sutsayi];
               for(int a = 1; a <= sutsayi; a++){
                    isimler[a-1]=rsmd.getColumnName(a);
               for(int k=0; rs.next(); k++){
                    for (int i = 1; i<=sutsayi; i++) {
                         datalar[k][i-1]=rs.getString(i);
               // Silly
// this = new JTable(datalar,isimler);
// So what now??
     catch (Exception ex) {
}

Thanx for your response camikr,
but I do know about JTable constructor and finding row and column count but I want to encapsulate the overhead by placing these into an extended version of a JTable class...
To accomplish this goal I found the row/column counts create the arrays but then I have to pass these to JTable (not in constructor because I am doing this by overriding the super class' constructor - the JTable's - and I can not pass (data array/ colum name array) these at the bottom of the constructor. Because you know that if I have to override but also call the super class' constructor I must do this at the first line of the constructor...)
So this wasn't what I want...
Thanx any way...

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}Right now it works fine, and I am planning on using this as an initial prototype for the presentation. Can I get some help on getting the output displayed into a JTable? How would I go abouts doing the conversion? I'm fairly new to Java (taking a course on it), and I'm worried that if I change one line of code the whole thing will get ruined and I'll need to start from scratch.

-> It sounds like you're getting annoyed with the amount of people asking perfectly legitimate questions
Your expectations are not legitimate. We attempt to understand your problem and give you the resources to solve the problem. Many times those resources are in the form of a tutorial or a reference to the API. We are not here to write code for you.
I pointed you in the right direction. Its up to you do to some learning on your own. You have not made the slightest effort to understand how to use a JTable. You have not made the slightest effort to search the forum to see if you question has been asked before (it has).
Your attitude and effort determines how much effort we make. Frankly you have made no effort whatsoever to solve you problem so as far as I am concerned you are on you own. Apparently I am not the only one who thinks you should be making more of an effort based on all the other advice you have received.

Re: Using JScrollPane With JTable

>
myNamePane.setVisible(true);This is meaningless, a component becomes visible by default when you add it to a visible container
if(e.getSource().equals(newStudent))
       JFrame newFrame = new JFrame("Please select a student");
       newFrame.setContentPane(myNamePane);
       newFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       newFrame.setResizable(false);
       newFrame.pack();
       newFrame.setVisible(true);
     }Which brings us to the main issue, you need to add the JScrollPane to you frame
newFrame.add(myNamePane);Read the tutorial: [Using Top-Level Containers|http://java.sun.com/docs/books/tutorial/uiswing/components/toplevel.html]

Hello Rodney,
Thanks for the information and the tutorial.. I've worked with containers before but never got around to reading that one, which has clarified a few things for me.
Unfortunately however, my problem persists. I obviously can't set the content pane as the JScrollPane and add it to the Frame, so rather than setting the JScrollPane as the content pane (which I did previously), I added it to the frame as you suggested:
if(e.getSource().equals(newStudent))
     JFrame newFrame = new JFrame("Please select a student");
//     newFrame.setContentPane(myNamePane);
     newFrame.add(myNamePane);
     newFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     newFrame.setResizable(false);
     newFrame.pack();
     newFrame.setVisible(true);
}But the same thing happens! All I see is a new, empty JFrame. I feel like my understanding of the JScrollPane may be flawed, but I'm really not sure :/
Edit: In fact, it is most definitely a problem either with my JTable or my JScrollPane. I used the setPreferredSize() method to check if the JScrollPane was being displayed in the JFrame, and it is. There is no JTable in the pane however.
Edit #2: The problem was, in fact, with my JTable. The ResultSet I was using was TYPE_FORWARD_ONLY, and I was trying to call studentNameSet.first(), which prevented the JTable from ever being created. Thanks for your help, Rodney. Although I do have one more question.. Do you know a better way for me to find the number of student names given that ResultSet? I can't iterate through it twice as I had done earlier, so now for testing purposes I've simply hardcoded the number in, but I'd rather have the program find the total number of entries dynamically.
Edited by: Pheer on Jul 22, 2008 10:07 AM
Edited by: Pheer on Jul 22, 2008 10:09 AM

Different parameter usage causes problem

Hi there,
I am creating a report based on a sql query. Therefore I have to parameters to filter the query i.e. "SELECT * FROM Person WHERE Birthday >= {?StartDate} AND BirthDay <= {?EndDate}". Both parameters are defined as Date.
This works so far. Then in the Field-Explorer I define a third parameter named "GroupName" which is dynamic and should be filled from the column "Groupname" of the resultset. This parameter is used to identify a leading group which is then separated from all the others.
My problem now is that I am asked twice to input parameters. First those two I defined in the query using the database wizzard (StartDate, EndDate). Then I am asked a second time to input all the three parameters (StartDate, EndDate, GroupName) where the two first parameters where prefilled with what I entered before. But the list of groupname is not filled so I can not select one or multiple values.
My questions are:
- Why am I asked twice and not once including all three parameters
- Why is group not filled in the parameter mask
- Is this behavior by design and if yes how can I workaround
This concerns Crystal Report 11 and 12.
Thanks for every hint.
Kind regards
Patrick
Edited by: Patrick Jox on Sep 18, 2008 9:06 AM

Hi Patrick,
I think in crystal if you create a parameter in command and then if you create a parameter from report then it will prompt twice. The only way is to create all the parameters in command or in report. Why you want to create a groupname parameter in report level but not in command?
Regards,
Raghavendra.G

JTable which recieves ResultSet as a parameter

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