AbstractTableModelS

Question

I'm new to java so please forgive any confusion with terminology etc, I'm currently sourcing a good reference text to use.
Basically I've got an AbstractTableModel class (MyTableModel) that creates a table model. To create the table model its constructor is fed a resultset (and table name not currently needed for my purposes) from another class thus
public MyTableMode aTblModel;
aTblModel = new MyTableModel(rsResultSet,"TableName");
Everything works OK so far with one table.
What I'm trying to do is to use this same AbstractModelClass (why write more code) to provide table models for more than one table (the ui allows the user to have concurrent access to multiple tables). Something like
aTblModel = new MyTableModel(rsResultSetA,"TableNameA") ;
bTblModel = new MyTableModel(rsResultSetB,"TableNameB") ;
However I'm obviously missing something major cause both instance variables wind up holding info for rsResultSetB (or whichever is called last) . I've tried various ways of setting the instance variables most work for one table but none establish two separate table models. I'm starting to wonder if I need to put each table model (aTblModel,bTblModel) into a vector or an array or something to differentiate them.
Any help is much appreciated, a nudge in the right direction at this point will save me much time - thanks.

Answer 1

I think the tablemodel is working for a single table but not when I put a second result set through it.
According to an article in the JDJ the AbstractTableModel has additional functionality so thats why I went down that path.
Here is some code that should be an example of the problem. Because the problem involves resultsets being fed to the tablemodel class I've included connection to a Access db (dummy.mdb) which just needs to be an empty mdb file - you'll see by the url. Two tables are created with two result sets and, unsuccessfully, two tablemodels. There are two classes for the example: UI the main class and TM the table model class. I've been using NetBeans to run this and everything ran OK to show the problem
Thanks again
--------------------------UI--------------------------------------
// UI
package ATMTest;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import java.util.*;
import java.lang.*;
import java.sql.*;
import ATMTest.TM.*;
//Declare a class
// table model is in the TM class
public class UI
// CONSTRUCTOR
public UI() {
try{
//-------Create dummy result sets
//NEEDS an empty mdb file dummy.mdb on root of c
UI.getConnection();
//MUST HAVE TWO SEPARATE STATEMENT VARS or the first recordset closes when the second is set - strange but true
tblSQLA = dummyCon.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
tblSQLB = dummyCon.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
//CREATE TWO TABLES AND PUT A SOME ROWS IN THEM - TableA and TableB must not be there when running
// ------TABLE A 2 columns 2 rows
tblSQLA.executeUpdate("SELECT 1 AS A1, 2 AS A2 INTO TableA;");
tblSQLA.executeUpdate("INSERT INTO TableA ( A1, A2 ) SELECT 2 AS Expr1, 3 AS Expr2;");
rsA = tblSQLA.executeQuery("SELECT * FROM TableA;");
//Instantiate the tblModel variable
tblModelA = new TM(rsA,"TableA") ;
//******TEST Table A should be A1
JOptionPane.showMessageDialog(null,"Table A 1st col = " + tblModelA.getColumnName(0), null, JOptionPane.INFORMATION_MESSAGE);
//--------TABLE B 3 columns 3 rows
tblSQLB.executeUpdate("SELECT 5 AS B1, 6 AS B2 ,99 as B3 INTO TableB;");
tblSQLB.executeUpdate("INSERT INTO TableB ( B1, B2, B3 ) SELECT 6 AS Expr1, 7 AS Expr2, 100 as Expr3;");
tblSQLB.executeUpdate("INSERT INTO TableB ( B1, B2, B3 ) SELECT 8 AS Expr1, 9 AS Expr2, 101 as Expr3;");
rsB = tblSQLB.executeQuery("SELECT * From TableB;");
tblModelB = new TM(rsB,"TableB") ;
//******TEST Table B should be B1
JOptionPane.showMessageDialog(null,"Table B 1st col = " + tblModelB.getColumnName(0), null, JOptionPane.INFORMATION_MESSAGE);
//******TEST Try model A again this should be A1 --- BUT ITS B1
JOptionPane.showMessageDialog(null,"Table A (after TableB model) 1st col = " + tblModelA.getColumnName(0), null, JOptionPane.INFORMATION_MESSAGE);
catch(SQLException e)
{System.out.println("boo" + e.getMessage());
catch (Exception e)
{   // Catch a connection failure
e.printStackTrace(System.err);
JOptionPane.showMessageDialog(null,"Connected to db failed: General Failure",
null,JOptionPane.INFORMATION_MESSAGE);
//Close the resultsets and connection
try{
rsA.close();
rsB.close();
dummyCon.close();
catch(SQLException e)
{System.out.println("hoo" + e.getMessage());
//Quit the app
System.exit(0);
// Method to Connect to mdb database
public static Connection getConnection()
throws ClassNotFoundException, SQLException
//Vars for the connection
String DBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
Class.forName(DBDriver);
String DBUrl = "jdbc:odbc:DRIVER={Microsoft Access Driver (*.mdb)};DBQ=c:/dummy.mdb";
String username = "admin";
String password = "";
//Connect and return the connection
return dummyCon = DriverManager.getConnection(DBUrl, username, password);
// MAIN METHOD
public static void main(String[] args)
UI uiMain = new UI();
     } // Closes main method
//Vars
public static ResultSet rsA, rsB ;
private Statement tblSQLA, tblSQLB ;
public static TM tblModelA, tblModelB;
private static Connection dummyCon;
} // CLOSE UI class
--------------------------TM--------------------------------------
// This is the tables model
package ATMTest;
import javax.swing.*;
import javax.swing.table.*;
import java.sql.*;
import java.util.Vector;
public class TM extends AbstractTableModel {
ResultSetMetaData rsMetaData;
     Vector allRows; // Contains all rows of the result set
     Vector row; // Individual row for a result set
     Vector colNames; // Contains all column names of the result set
     public static String dbColNames[];
     String pkValues[];
     String pKeyCol;
     Vector deletedKeys;
Vector newRow;
     Vector newRows;
     boolean ibRowNew = false;
     boolean ibRowInserted = false;
// Constructor
public TM(ResultSet rsIn, String tblNameIn){
this.rsTM = rsIn;
this.reqTblName = tblNameIn;
try{              
deletedKeys = new Vector();
          newRows = new Vector();
          ResultSetMetaData rsMetaData = rsTM.getMetaData();
colNum = 0;
rowNum = 0;
//GET THE num of cols and then go over them and get their names
          colNum = rsMetaData.getColumnCount();
          dbColNames = new String[colNum];
     for(int col = 0; col < colNum; col ++){
               dbColNames[col] = rsMetaData.getColumnName(col + 1);
          allRows = new Vector();
          while(rsTM.next()){
newRow = new Vector();
for(int i = 1; i <= colNum; i++){
     newRow.addElement(rsTM.getObject(i));
} // for
allRows.addElement(newRow);
//rowNum++;
          } // while
rowNum = getRowCount();
JOptionPane.showMessageDialog(null,"TableModel execution: " + reqTblName + " col# " + colNum + " row# " + rowNum, null, JOptionPane.INFORMATION_MESSAGE);
System.out.println ("TableModel execution: " + reqTblName + " col# " + colNum + " row# " + rowNum);
     catch(SQLException e){
          System.out.println(e.getMessage());
}//End of TM CONSTRUCTOR
public String getColumnName(int col){
     return dbColNames[col];
public int getRowCount(){
     return allRows.size();
public int getColumnCount(){
     return colNum;
public Object getValueAt(int arow, int col){
     row = (Vector) allRows.elementAt(arow);
     return row.elementAt(col);
//Var declaration
private static ResultSet rsTM ;
private static String reqTblName;
private Statement sqlStatement;
public static int colNum ;
public static int rowNum ;
} // END CLASS