public void showData(JTable table, DefaultTableModel model, String qry) throws SQLException{
        Connection c = null;
        Statement stmt = null;

        c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres","postgres","199591");
        stmt = c.createStatement();


        ResultSet rs = stmt.executeQuery(qry);
        print(table, rs);

        rs.close();
        stmt.close();
        c.close();
    }





public void print(JTable table, ResultSet rs) throws SQLException{

        Vector<Object> columnNames = new Vector<Object>();
        Vector<Object> data = new Vector<Object>();
        ResultSetMetaData md = rs.getMetaData();
        int columns = md.getColumnCount();


        for (int i = 1; i <= columns; i++) {
            columnNames.addElement( md.getColumnName(i) );
        }

        //  Get row data

        while (rs.next())
        {
            Vector<Object> row = new Vector<Object>(columns);

            for (int i = 1; i <= columns; i++){
                row.addElement( rs.getObject(i) );
            }

            data.addElement( row );
        }

        DefaultTableModel model = new DefaultTableModel(data, columnNames)
        {
        	@Override
            public Class getColumnClass(int column)
            {
                for (int row = 0; row < getRowCount(); row++)
                {
                    Object o = getValueAt(row, column);

                    if (o != null)
                    {
                        return o.getClass();
                    }
                }

                return Object.class;
            }
        };

        table.setModel(model);

        DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
        centerRenderer.setHorizontalAlignment( JLabel.CENTER );
        table.setDefaultRenderer(String.class, centerRenderer);


        }