Affect row count from insert, update and delete

[shawnclovie]

Is your feature request related to a problem? Please describe.
Some time I'd like to know how many rows changed after UPDATE statement executed, to control parallel access.
e.g.
SELECT id,update_time FROM TableA
UPDATE TableA SET SOMETHING WHERE id=? AND update_time=?
If no rows affected, the progress may retry.

Describe the solution you'd like
I was used go-pg for golang, each execute function (Update, Insert, Delete) may return orm.Result, I can call RowsAffected() from it.

If I missed something, please let me know, thanks.

[abidon]

This feature would be appreciated here as well.

If the team (@tanner0101 or @gwynne maybe?) could provide any pointer/hint about:

• where this should be implemented for each driver
• how the exposed API should look like

; I would be glad to help and provide an implementation.