Question

my code works fine but I am getting this exception a lot and it’s causing a little lag … I suspect this part to produce the exception

try {
        try {
            rs = dbConnection.getStatement().executeQuery("SELECT * FROM healthgym.member WHERE member_id = " + id);
            rs.next();
        } catch (SQLException ex) {
            Logger.getLogger(Controller.class.getName()).log(Level.SEVERE, null, ex);
        }
        m.setMember_id(rs.getInt("member_id"));
        m.setRec_id(rs.getInt("rec_id"));
        m.setTrainer_id(rs.getInt("trainer_id"));
        m.setFname(rs.getString("fname"));
        m.setLname(rs.getString("lname"));
        m.setMname(rs.getString("mname"));
        m.setEmail(rs.getString("email"));
        m.setPhoneNo(rs.getInt("phoneno"));
        m.setAge(rs.getInt("age"));............

I use the m object later to fill some text fields

Edit 1 : I am still getting that exception … here is what happens exactly … I select a row in Jtable and I press the edit button the exception is thrown but it works fine
here is what’s called when i press the edit button

  private void editButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here:
    int id = ((Number) model.getValueAt(jTable1.getSelectedRow(), 0)).intValue() ;
    System.out.println(id);

      m = new Member();
    c.getMember(m,id);

    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new EditMember(c,model,m).setVisible(true);
        }
    });


}       

And EditMember is a GUI here is its constructor..

public class EditMember extends javax.swing.JFrame {

/** Creates new form EditMember */
public EditMember(Controller c, ResultSetTableModel model , Member m) {

    initComponents();
    this.c = c;
    this.model = model ;
    this.m = m ;
    memberID.setText(Integer.toString(m.getMember_id()));
    recID.setText(Integer.toString(m.getRec_id()));
    trainerID.setText(Integer.toString(m.getTrainer_id()));
    fName.setText(m.getFname());
    lName.setText(m.getLname());.......

Edit 2 :

That;s where the exception happens :

public Object getValueAt( int row, int column )
  throws IllegalStateException


  {
      // ensure database connection is available
      if ( !dbConnection.isConnectedToDatabase() )
         throw new IllegalStateException( "Not Connected to Database" );
  // obtain a value at specified ResultSet row and column

  try
  {
     resultSet.absolute( row + 1 );
     return resultSet.getObject( column + 1 );
  } // end try
  catch ( SQLException sqlException )
  {
      System.out.println("Exception from here dude");
     sqlException.printStackTrace();
  } // end catch

I guess the problem is because I am using the same resultset that I used before to construct the JTable.

Answer 1

it should be

    if(rs.next(){
  m.setMember_id(rs.getInt("member_id"));
}

So all set value will be in try block.

Why you are getting error ?
Because sometime when result is empty the result set will be closed by rs.next()

If you put it in while {where there are multiple row in result of query} or if {when you accept only one row in query output }.