Pass PrintError => 0 as an option in your connect string. From perldoc DBI:

           The "\%attr" parameter can be used to alter the
           default settings of "PrintError", "RaiseError", "Auto­
           Commit", and other attributes. For example:
 
             $dbh = DBI->connect($data_source, $user, $pass, {
                   PrintError => 0,
                   AutoCommit => 0
             });
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Update: Fixed bogus entity; added 'perldoc'.