UNIQUE KEY

Hi,
I'm trying to maintain a unique key in an Oracle Table while working on the
table using DBI. the unique key is just a no. read in from a txt file and
incremented for each record - supposedly. In fact I'm getting unique
constraint violation. Can anybody tell me what is wrong with this code,(the
statement handler inserts into the table)
cheers,
Mark

if (condition){
		open (IN,$uniquefile) or die "Cannot Open $uniquefile \n";
		$uniquemarker=<IN>;
		close(IN);
		$uniquemarker++;

		$sth1->execute($uniquemarker,$var1,$var2) or die "Can't execute SQL
statement: $DBI::errstr\n";					
		}

		open (OUT,">$uniquefile");
		print OUT "$uniquemarker";

$dbh1->disconnect();
exit;

• UNIQUE KEY by Mark Martin
• RE: UNIQUE KEY by Hanson, Robert
• RE: UNIQUE KEY by Peter Cornelius
• Re: UNIQUE KEY by Jenda Krynicky