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Re: Using a command-line program (sqlite3) as a backend


From: Chetan
Subject: Re: Using a command-line program (sqlite3) as a backend
Date: Tue, 24 Mar 2009 14:38:34 -0700
User-agent: Emacs Gnus

florian <address@hidden> writes:

> It seems to me I have a rather basic question:
>
> I would like to use an SQLite database, and be able to query and
> modify it from Elisp functions. It seems that nobody has written Elisp
> bindings for the SQLite library yet, and I am definitely not smart
> enough to do that myself.
>
> So I gather I will have to use SQLite's command-line interface,
> sqlite3. I don't see much of a problem in parsing the output (in fact,
> I've already written that), but I am wondering about the differences
> between running sqlite3 as a synchronous process for every query (in a
> one-shot fashion), and starting it up once, as an asynchronous
> process, and then having it linger in the background, sending it
> commands and parsing the output it returns as needed.
>
> To me, the synchronous method seems more robust, but I am wondering
> whether it will scale well (supposing I get fond of using the database
> and start to use it for more and more complex things). As to the
> asynchronous method, I seem to have heard that I/O via stdin and
> stdout is prone to, er, I don't know: hang? lock? I've forgotten, but
> I would much appreciate to be warned if that is the case.
>
> (I have tried to find hints in ispell.el (since that seems to be a
> similar situation), but only found out that it implements indeed
> both.)
>
> Can anybody offer me any advice here? Thanks so much!
>
> Florian
Doesn't it work from shell running in emacs?


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