Hi Peter,
If all you need is the lengths of the blobs, then you could use the
length() function:
select length( blobColumn ) from myTable
For null blobs, the returned value will be null.
Hope this helps,
-Rick
epdv wrote:
Hello!
I want to read blobs in a loop (more exact: the length of the blobs).
I'm using a connection with autocommit(true) and a prepared statement
with sth. like "select mydata, myblob where mykey=?".
Then I'm using the following loop:
while (rs.next()) {
int m = wantedColumnNames.length;
Blob blob = (Blob)rs.getObject(x);
if (blob == null) {
result = 0L;
} else {
result = blob.length();
blob.free();
}
...
}
I'm always getting an error message saying that the blob cannot be
released after closing, probably the transaction had already been
committed. As connection is in autocommit mode, I assume it has
already been closed after statement execution, but it I try
non-autocommit mode, the resultset is not open after execute (at least
derby says that). How can I get the expected result?
BTW, using derby 10.4.2.0 in client/server mode.
Kind regards
Peter