If I assume you want to use the value to insert a new row, I would go
for something like (pseudo code):
# Reset number of tries
$trycount=0;
{
# Increase number of tries
$trycount++;
# Make sure we don't try forever
last if ($trycount > 10)
# Put last id + 1 in $id
SELECT MAX(id)+1 FROM table;
# Try to insert new row and check for errors
INSERT INTO table (id,col1,coln) VALUES ($id,$col1,$coln);
# Try again
redo if (error eq "Unable to insert due to duplicate values");
}
# Handle too many tries
die "Too many tries" if ($trycount > 10);
The things you need to know is the key (id) of the table and
how DBD:ODBC reports a failure to insert because a row is already
there (someone else was faster).
/brother t0mas
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