Jsp and sql - very slow performance

Question

Hello,
I am new to java and working on my site.
I encountered very low performance when I have implemented this function.
This functions counts responses for each ad.
Could you share know-how about better implementation?
in index.jsp I have this call:
out.println("<td align=\"center\">" + getRecords.countOffers(A.getIdads()) + "</td>");
this is getRecords.countOffers:
public static int countOffers(int ID) {
int offersqty = 0;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = (Connection) DriverManager.getConnection(DBurl, user, password);
Statement stmnt = (Statement) con.createStatement();
String readTopic = "SELECT idoffers FROM `wishloft`.`offers` where idads='" + ID + "';";
ResultSet displayTopic = stmnt.executeQuery(readTopic);
while (displayTopic.next()) {
offersqty++;
displayTopic.close();
con.close();
} catch (Exception e) {
return offersqty;
}

Answer 1

Well, for starters, when posting additional code, please use tags.
As for "looking" correct, I would offer these suggestions:
- Use a PreparedStatement instead of just a String to build your query (as I suggested earlier)
- Since you are expecting only 1 record from your query, why use a while() loop?  If someone else has to come in and look at your code, it could lead to confusion.  Just get the first record and process it without any loops.
Also, only you can tell us if it performs correctly, because you should know what the results are since it's your data.