[NFR] Support for PDO Multi-rowset

[aleemb]

Would be nice to see support for multi-rowset queries as it's desirable for performance gains (especially when DB server RTTs are a concern). Adding nextRowSet() to the PDO driver would be welcome so as to be able to iterate over the results of the next rowset when executing multiple statements separated by a semicolon.

Also, until that support is added, is there any good workaround to do multi-rowset queries presently through the existing PDO adapters (something like raw or passthrough)?

[aleemb]

Okay, just saw getInternalResult(), that should help pass through for now.

Adding nextRowSet() would still be nice to encourage its use.