Re: ORDER BY ? PARAMETER ??

[neuling@xxxxxxxxx]

Hi Tom,

a prepared statement is a precompiled statement, so each field has to be 
stated. You can only replace constants by "?". In your case you can use 
the class Statement. Please try coding as follows:

String parameter = null;
String newStatement = null;
ResultSet rs = null;
Statement stmt = null;
PreparedStatement ps = null;

 if ((parameter = request.getParameter("SORT")) == null){
        ps = conn.prepareStatement("SELECT * FROM LIB.CUST ORDER BY cmgage 
"); 
        rs = ps.executeQuery();
 }
 else {
        stmt = conn.createStatement();
        rs = stmt.executeQuery("SELECT * FROM LIB.CUST ORDER BY " + 
parameter);
 }



Mattias





tmalin@hannasteel.com
Sent by: owner-java400-l@midrange.com
18.07.00 19:09
Please respond to JAVA400-L

 
        To:     JAVA400-L@midrange.com
        cc: 
        Subject:        ORDER BY ? PARAMETER ??


Is it possible to sort a database with an HTML form to select the sort
criteria value and then  passing the value as a parameter to a servlet? 
The
following code snippet from my servlet will not work with ? for ORDER BY:
Do you have any suggestions?

 String parameter = null;
            if ((request.getParameter("SORT")) == null)
                     stmt = conn.prepareStatement("SELECT * FROM LIB.CUST"
+
                   " ORDER BY cmgage "); // Execute the query
                else {
             parameter = request.getParameter("SORT");
         stmt = conn.prepareStatement("SELECT * FROM LIB.CUST " +
        " ORDER BY ? " ); // Execute the query
       stmt.setString(1, parameter);



Tom




+---
| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to 
JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net
+---


+---
| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net
+---