Query\Mysql\Update object with LIMIT feature

Start to develop non-standard SQL features for different database engines.
Proposed structure is:
Aura\Sql\Query/Mysql/Update.php
Aura\Sql\Query/Mysql/Select.php
Aura\Sql\Query/PgSql/Select.php
...
Aura\Sql\Query\Select.php
Aura\Sql\Query\Update.php
Aura\Sql\Query\Delete.php
and so on.