cannot auto increment id in above code{

String sql = "insert into artist_reg_ml (id,uname,pwd,email,country) values (?,?,?,?,?)";

PreparedStatement pst = conn.prepareStatement(sql);

pst.setString(1, "5");

pst.setString(2, uname);

pst.setString(3, pwd);

pst.setString(4, email);

pst.setString(5, country);

int i = pst.executeUpdate();

String msg = "";

if (i != 0) {

//msg = "Record has been inserted";

//pw.print("" + msg + "");

HttpSession sess = request.getSession();

sess.setAttribute("uname", request.getParameter("uname"));

sess.setAttribute("pwd", request.getParameter("cpwd"));

RequestDispatcher dispatcher = request.getRequestDispatcher("/mypage1.jsp");

dispatcher.forward(request, response);

File dir = new File("C:/Users/Naresh/Documents/NetBeansProjects/Registrationform/web/nameoffolder/" + uname);

dir.mkdir();

}

解决方案try this.. it works

{

PreparedStatement pst1 = conn.prepareStatement("select max(id)+1 from artist_reg_ml");

ResultSet rs = pst1.executeQuery();

String user_id ="" ;

while(rs.next())

{

user_id = rs.getString(1);

}

String sql = "insert into artist_reg_ml (id,uname,pwd,email,country) values (?,?,?,?,?)";

PreparedStatement pst = conn.prepareStatement(sql);

pst.setString(1, user_id.toString());

pst.setString(2, uname);

pst.setString(3, pwd);

pst.setString(4, email);

pst.setString(5, country);

int i = pst.executeUpdate();

String msg = "";

if (i != 0) {

HttpSession sess = request.getSession();

sess.setAttribute("uname", request.getParameter("uname"));

sess.setAttribute("pwd", request.getParameter("cpwd"));

File dir = new File("C:/Users/Naresh/Documents/NetBeansProjects/Registrationform/web/nameoffolder/" + uname);

dir.mkdir();

RequestDispatcher dispatcher = request.getRequestDispatcher("/mypage1.jsp");

dispatcher.forward(request, response);

}