Sometimes you have some data to update but someone slips in some stuff thats not in the database yet. Well, you could explicitly check if it's there using a SELECT or you could do something like this...
my $sth = $dbh->prepare("UPDATE $table SET upc=$upc WHERE item_id=$ite
+m_id;");
die "DBH Error:" . $dbh->errstr . "\n" if (!$sth);
if (!$sth->execute) {
    # Oops!  $item_id doesn't exist in $table so add it.
    my $sth = $dbh->prepare("INSERT INTO $table (item_id, upc) VALUES(
+$item_id, $upc);");
    die "DBH Error:" . $dbh->errstr . "\n" if (!$sth);
    die "STH Error:" . $sth->errstr . "\n" if (!$sth->execute);
}

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In reply to Database Update or Insert by Mr. Muskrat

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