[Zope-dev] Re: [DB-SIG] SQLite as a Light DB component for Zope and Python

[jose]

Magnus Lyckå wrote:

> At 17:54 2002-04-01 -0800, William Trenker wrote:
>
>> but a greenhorn at extending Python yet I had a
>> crude but working Python extension module for
>> SQLite up and running in 2 days
>
>
> So, we expect to see the announcement of a DB-API 2
> complient SQLite driver any day then! :-)
>
>> Implements a large subset of SQL92.
>
>
> I'd say a small subset, or perhaps sideset: 

If you campare it with OCELOT you are right but you have to compare it 
with Gadflay.

>
>
> SQLite implements the follow syntax:
> ·       BEGIN TRANSACTION (END COMMIT ROLLBACK)
> ·       COPY
> ·       CREATE INDEX
> ·       CREATE TABLE
> ·       CREATE VIEW
> ·       DELETE
> ·       DROP INDEX
> ·       DROP TABLE
> ·       DROP VIEW
> ·       EXPLAIN
> ·       expression
> ·       INSERT
> ·       ON CONFLICT clause
> ·       PRAGMA
> ·       REPLACE
> ·       SELECT
> ·       UPDATE
> ·       VACUUM
> (Or at least that's what the language reference at
> http://www.hwaci.com/sw/sqlite/lang.html says.)
>
> No GRANT / REVOKE or any other kind of security.
> It seems to be a plain single user thingie.
>
> No ALTER TABLE, SET TRANSACTION etc. Ok, these aren't
> actually in Entry SQL 92, but everybody else has them...
>
> And COPY, PRAGMA, REPLACE, VACUUM, ON CONFLICT etc is
> not in any SQL standard I know of.
>
> It violates SQL92 in a number of ways it seems. For
> inststance, it's typeless (like GadFly) which means that
> for instance "00" == "0". There are a lot of error
> checking in SQL that this engine won't do.
>
> SQLite ignores checks in CREATE TABLE and has no foreign
> keys?
>
> But it seems a bit closer to SQL than GadFly...and apart
> from typelessness it seems to support rather extensive
> SELECT statements. It might be a very useful thing I guess.
> There are plenty of cases where installing an RDBMS is
> overkill.
>
>> Small memory footprint: less than 20K lines of C code.
>
>
> Erh? Measuring memory footprint in kLoC seems a bit like
> measuring mass in meters. Although according to the 2.4.0
> release notes at freshmeat it seems the binary image needs
> less than 200kB! Question is how much RAM that actual data
> requires. If it lifts entire tables into RAM it might be
> very memory hungry for large databases.
>
>> Four times faster than PostgreSQL. Twice as fast as SQLite 1.0.
>
>
> Yea yea, it just depends on what you measure. And how.
> PostgreSQL is infinitely faster on the features SQLite
> doesn't support... Benchmarking is a bit too complex to
> just describe like a scalar like that.
>
>> The author, <mailto:drh@hwaci.com>D. Richard 
>> <mailto:drh@hwaci.com>Hipp, is a computer science Ph.D. who knows his 
>> stuff.  This is not green software, it is well designed and tested.  
>> It was first released in May 2000 and is very actively updated and 
>> supported.
>
>
> So, how active is the mailing list? And how good? I saw
> a subscribe link, but no archive (maybe I just missed it.)
>
>
The SQLite mailing list is very active. I am a list member.

Jos