MSAccess DB Exception

Question

I have Customer table in which i have CustomerNumber and CustomerName and i put the name in session and want to retrieve CustomerNumber associated with that Name but when i run the query i get the following exception . here my snippet code:
HttpSession session=req.getSession(true);
String fName = (String)session.getAttribute("name");
out.println(fName); // Here it displays name but problem in Query
PreparedStatement pstmt=con.prepareStatement("Select CustomerNumber from Customer where FirstName=" +fName);
ResultSet rs=pstmt.executeQuery();
while (rs.next()){
out.println(rs.getInt("CustomerNumber"));
}               I get following error
Exception caught : [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.

Answer 1

So here's the whole lot with the edit:
HttpSession session=req.getSession(true);
String fName = (String)session.getAttribute("name");
out.println(fName); // Here it displays name but problem in Query
PreparedStatement pstmt=con.prepareStatement("Select CustomerNumber from Customer where FirstName = ?");
pstmt.setString(1, fName);
ResultSet rs=pstmt.executeQuery();
while (rs.next()){
out.println(rs.getInt("CustomerNumber"));
}