RTFM! At the top: 
$rv = $dbh->do($statement);
$rv = $dbh->do($statement, \%attr);
$rv = $dbh->do($statement, \%attr, @bind_values);

[download]
Since @bind_values is the 3rd arg and you aren't specifying \%attr, you use either undef or {} in it's place: 
$rv = $dbh->do($statement, undef, @bind_values);
$rv = $dbh->do($statement, {}, @bind_values);

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So, then what is \%attr used for? Well, search for that string in the docs and you will be lead to: 
   Notation and Conventions

   The following conventions are used in this document:
      $dbh    Database handle object
      $sth    Statement handle object

      ... yadda yadda ...

      undef   NULL values are represented by undefined values in Perl
      \%attr  Reference to a hash of attribute values passed to methods
Do a little more research first, then ask us. :)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to 3Re: DBI prepare() vs do() usage by jeffa
in thread DBI prepare() vs do() usage by kiat

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