Description:
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PDO is very similar in design to Perl's DBI which does allow you to set driver specific attributes such as mysql_client_found_rows=1 as part of the DSN. Setting the attribute mysql_client_found_rows=1 is Perl's DBD::mysql will make the rows() method (equivalent of PDO's rowCount()) return the number of rows matched for the update and not just those that were actually updated.

This is a very useful/efficient feature as it prevents the need for doing 'SELECT COUNT(*)' queries before doing the updates and it prevents the need for locking too (since 2 statements are no longer atomic).

PDO has a setAttribute() method, but there is as yet no 
MYSQL_ATTR_CLIENT_FOUND_ROWS constant. My request is that this be built into the PDO mysql driver. The information rowCount() will need can be retrieved from mysql_info().