PEAR:DB get the SQL String

Hi all First of all im verry new with Pear and i'm surre this is e newbi question but i diden't found something in the manual or the archiv. I use the folling code to insert a row: $sth = $db->autoExecute($table_name, $table_fields, DB_AUTOQUERY_INSERT); With mysql everything works fine, but with sqlserver driver die ($sth->getMessage()); ouput the folling error: DB Error: Thats not mutch. Is there any possibillity to output the genereated SQL String from prepare, execute or autoexecute, that would be verry usefully. Thanks Marco