There's a problem with MySQL and placeholders which I discovered in Re^2: DBD::mysql Unusual Behavior. The only sure-fire way to work around it is to ensure that your string values are string values. In short, this means that the internal type of the variable is set correctly.

If the first variable sent into the placeholder is an integer, subsequent calls using the same statement handle might fail on string data. Here, this is just a do() call, so you're probably okay. If you use prepare() and more than one execute() you can encounter problems. 
sub insertAttribute
{
    my ($serverID, $featureID, $value) = @_;
    my $sqlINS = "INSERT INTO attribute VALUES (?,?,?)";

    $dbh->do($sqlINS, {},
              "$serverID",
              "$featureID",
              "$value");
}

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Of course, this might depend on the version of DBD::mysql that you use.

In reply to Re^2: Quote mark in string messing up mySQL INSERT by tadman
in thread Quote mark in string messing up mySQL INSERT by heezy

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