DefaultTableModel dm=(DefaultTableModel)tbl.getModel();

        try{
    Class.forName("java.sql.Driver");
    Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/gunu","root","tiger");
    Statement stmt=conn.createStatement();
    String qry="select * from teacher;";
    ResultSet rs=stmt.executeQuery(qry);
    while(rs.next()){
    String val1,val2,val3,val4,val5,val6;
    val1=rs.getString("no");
    val2=rs.getString("name");
    val3=rs.getString("age");
    val4=rs.getString("dept");
    val5=rs.getString("dojoin");
    val6=rs.getString("salary");
    Object row[]={val1,val2,val3,val4,val5,val6};
    dm.addRow(row);

    }

}catch(Exception e){
    System.out.println(e);
}