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SQL : count(*)  for number of rows may help.
Mathias Dahl wrote:
> Mathias Dahl <brakjoller@gmail.com> writes:
>
> > I can attach a process filter function to the process but I don't
> > understand how to "pause" my main code until my filter function has
> > been called. Well, I came up with a hack, that seems really ugly:
> >
> > (defvar foo-output nil)
> >
> > (defun foo ()
> >  (process-send-string process "blabla")
> >  (setq foo-output nil)
> >  (while (not foo-output)
> >    (sleep-for 0 10))
> >  (use-result))
> >
> > (defun foo-filter (proc string)
> >  (setq foo-output string))
>
> And I just discovered that even the above won't work because I receive
> data in chunks. I guess the question I am asking is: how to I know
> when there is no more output? Maybe I need to look for signs in the
> output itself?