Requerying MS Access table?

Question

Hi,
Ok, I got my insert statement to work now using a preparedstatement. I noticed now that my JTable doesn't reflect the new record unless I stop and restart my application.
I'm using a JTabbedPane and adding a class that extends AbstractTableModel on one tab. On another tab I have a JPanel with my controls for inserting a record.
I setup a ChangeHandler and add it to the listener of the JTabbedPane, this detects when I switch tabs. If the current tab is my table tab I set the tableModel = null and rebuild it. This seemed the best approach. When I do this I get an SQLException from the tableModel.getValueAt() method saying the result set is closed.
Here's what I think is the pertenant code (let me know if you want to see something else):
private class ChangeHandler implements ChangeListener
public void stateChanged( ChangeEvent e )
if ( tabbedPane.getSelectedIndex() == 0 )
tableModel = null;
buildResultTable();
} // end if
} // end method stateChanged
} // end private inner class ChangeHandler
public void buildResultTable()
// create TableModel
tableModel = new MyTableModel( dbConnection );
try
tableModel.setQuery(
"SELECT date, odometer, trip_meter, no_gallons FROM records ORDER BY date desc" );
} // end try
catch ( SQLException sqlException )
JOptionPane.showMessageDialog( null, sqlException.getMessage(),
"Database Error - buildResultTable", JOptionPane.ERROR_MESSAGE );
} // end catch
// create JTable delegate for tableModel
resultTable = new JTable( tableModel );
resultTablePane = new JScrollPane( resultTable );
} // end method buildResultTable
public void setQuery( String query ) throws SQLException, IllegalStateException
// ensure database connection is available
if ( !connectedToDatabase )
throw new IllegalStateException( "Not Connected to Database" );
// specify query and execute it
resultSet = statement.executeQuery( query );
if ( resultSet == null )
System.out.println( "Query didn't work!" );
// obtain meta data for ResultSet
metaData = resultSet.getMetaData();
// determine number of rows in ResultSet
resultSet.last(); // move to last row
numberOfRows = resultSet.getRow(); // get row number
// notify JTable that model has changed
fireTableStructureChanged();
} // end method setQuery
public Object getValueAt( int row, int column ) throws IllegalStateException
if ( !connectedToDatabase )
throw new IllegalStateException( "Not Connected to Database" );
// obtain value at specified REsultSet row and column
try
resultSet.absolute( row + 1 );
return resultSet.getObject( column + 1 );
} // end try
catch ( SQLException sqlException )
JOptionPane.showMessageDialog( null, sqlException.getMessage(),
"Database Error - getValueAt", JOptionPane.ERROR_MESSAGE );
} // end catch
return ""; // if problems, return empty string object
} // end method getValueAt
I'm new to Java so I'm sure there's a better way to do what I'm trying to do. Any ideas where I went wrong or a better way to do it? Any help is greatly appreciated.
Thanks in advance,
Linn

Answer 1

Ok, I got my insert statement to work now using a
preparedstatement. I noticed now that my JTable
doesn't reflect the new record unless I stop and
restart my application.MS Access? That question is asked every week here.
Here's an instance I picked at random from a forum
search for "access insert":
http://forum.java.sun.com/thread.jspa?forumID=48&threa
dID=348300Yeah, I thought it would be a common issue but I've spent the better part of three days going over google searches for this answer but no luck yet. Probably just haven't found the right combination of search terms yet.
I checked that forum thread you suggest and it, like all the others I've found, don't actually answer the question. They all seem to end with someone asking the original poster for more information and that's the end of the discussion thread.
Maybe if I rephrase the question, here's what I'm doing...
I query Access and build a JTableModel from a resultset.
I insert a new record into Access.
I switch over to Access and see that the record is inserted, Access shows that the insertion worked. (I switch tasks in Windows without quiting out of my Java app.)
I switch back to my Java app. and look at the table and the inserted record is not there yet.
So, what I'm thinking is that I need to "requery" the Access database and the new record should be included. My question is, how do I do that? How do I requery or refresh my resultset?
Oh, let me mention that I open the database connection and setup statement and resultset objects when I launch my app. and close them when I exit the app.
If I simply try to requery the database it throws an sqlException in the getValueAt() method of my TableModel extension class.
sqlException: Result set is closed is the message and is thrown by the line resultSet.absolute( row + 1 ); Here is the getValueAt() method code:
public Object getValueAt( int row, int column ) {
// obtain value at specified ResultSet row and column
try {
resultSet.absolute( row + 1 );
return resultSet.getObject( column + 1 );
catch ( SQLException sqlException ) {
sqlException.printStackTrace();
return ""; // if problems, return empty string object
} // end method getValueAt
Any help is greatly appreciated.
Thanks,
Linn