Bug in getUpdateCount using Oracle

Question

getUpdateCount() dos not return the right value (-1) when invoked for the second time.
I wrote the following piece of code to "dynamically execute an unknown SQL string".
According to the documentation the code is OK.
I use a stmt that does either an insert, update or delete.
When I run it with Sybase it works fine, the second time I invoke getUpdateCount() it returns -1, indicating there are no more updates counts (nor resultsets).
In the case of Oracle, the getUpdateCount keeps returning the original value and the program enters an infinite loop.
Can anybody help me with this?
Maybe is the version of the Oracle interface I am using (java12.zip as it comes with the package).
The code is:
String sqlStmt = "delete from table...";
// con was already created and is ok, because all selects
// work fine
// DRIVER = oracle.jdbc.driver.OracleDriver
// URL = jdbc:oracle:thin:@xx.xx.xx.xx:3521:orasd99
stmt = con.createStatement();
int guc = 0;
boolean esResult = stmt.execute(sqlStmt);
try {
while (true) {
if (esResult) {
ResultSet rs = stmt.getResultSet();
procesarResultSet(rs); // just process the rs
else {
guc = stmt.getUpdateCount();
if (!esResult && (guc == -1)) break;
esResult = stmt.getMoreResults();
Thanks in advance for any tip.
Ag~

Answer 1

"delete from table" doesn't return a result set.
From the documentation for getUpdateCount()
"if the result is a ResultSet object or there are no more results, -1 is returned."
Presumably you are using this because the SQL you are using could have more than one result set. -1 is returned in two cases:
-No more results
-The result is a ResultSet (a query.)
Personally I wouldn't rely on 'update counts' from JDBC for anything. The methods are not vital to the functioning of the interface and consequently they simply might not return the correct value. If you want an accurate count use a stored procedure.