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my $sql = "select MNref from comment_record where MNid=" . "\"$self->{
+_MNid}\"";
my $ccr = $dbh->prepare($sql);
$ccr->execute() or die "$!";

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my $sql = "select MNref from comment_record where MNid= ?";
my $ccr = $dbh->prepare($sql);
$ccr->execute($self->{_MNid}) or die $ccr->errstr;