Comparing data in the database with the input text

Question

hi there i have problem with the comparing data in the database with the input text. here is the piece of code of mine:
//declaration
datasourcedb.connect();
String stcode = req.getParameter("txtCode");
ResultSet rs = null;
String action = req.getParameter("action");
ResultSet portquery = null;
if (action.equals("SELL"))
-->portquery = datasourcedb.query("SELECT stockcode FROM portfolio where stockcode =\'"+ stcode + "\'");
-->portquery.next();
-->if((portquery.wasNull()) == true)
disp = req.getRequestDispatcher("error.jsp"); }
else */
Status = "Sell";
datasourcedb.close();
with the code that i marked with --> it doesnt work since i have to compare the input text stcode with stockcode in the db. could anyone tell me how to compare it?
regards
virginia

Answer 1

i have try to change into this code:
if (action.equals("SELL"))
portquery = datasourcedb.query("SELECT distinct stockcode FROM portfolio where stockcode =\'"+ stcode + "\' + and userName = \'"+ user + "\'");
if(portquery.next()) {
Status = "Sell";}
else {               
disp = req.getRequestDispatcher("error.jsp");
but so far the coding doesnt give any result.... could anyone help me? since the coding does not reach status n the disp