Trace/Debug a JDBC2 query

Question

Hi,
How do I trace/debug a JDBC query before it gets executed by Oracle.
I have a query that works in SQL Plus, but when I try to execute it from my application, it always gives an empty resultset. (The connection works, and all other queries works).
Here is the query in Java format:
"SELECT instrument_id, code, name, " +
" latest_buy, latest_sell " +
"FROM instrument " +
"WHERE upper(name) like(upper('?%')) " +
" OR upper(code) like(upper('?%')) " +
"ORDER BY name";
I replace the question marks by using, setString in PreparedStatement.
Now I would like to view the final query before execution. How should I do that?
thanks
/Kaj
[email protected]
null

Answer 1

(1) You cannot replace values inside of SQL quotes. The ? in you query are literal characters.
(2) You can see how JDBC transforms your SQL with the following code snippet from the JDBC manual.
import oracle.jdbc.driver.OracleSql;
public class Foo
public static void main (String args[]) throws Exception {
show ("{call foo(?, ?)}");
show ("{? = call bar (?, ?)}");
show ("{d '1998-10-22'}");
show ("{t '16:22:34'}");
show ("{ts '1998-10-22 16:22:34'}");
public static void show (String s) throws Exception {
System.out.println (s + " => " + new OracleSql().parse (s));
} }