Re: offset-based hash table for ASCII data

From:
Robert Klemme <shortcutter@googlemail.com>
Newsgroups:
comp.unix.programmer,comp.lang.java.programmer,comp.programming
Date:
Sun, 20 Apr 2008 14:27:58 +0200
Message-ID:
<670r6fF2n2fa5U1@mid.individual.net>
On 16.04.2008 18:01, Rex Mottram wrote:

Mark Space wrote:

If you find anything interesting, let us know.


I apologize for letting other parts of this thread devolve into a
useless squabble. But for those of you with a substantive interest, let
me report back that I'm getting moderately interested in/excited about
the CDB ("constant database") family.

Having realized that what I'm looking at can be thought of as a constant
 (meaning write once, read many) database, I did some searching and
found CDB. The original CDB package is C code which is unchanged since
2000 but still works fine. There's also a "TinyCDB" fork of the project
which is newer and ported to Windows and still format-compatible with
the original.

Most interestingly, there are APIs for a number of languages including a
jar file for Java (this version is called sg-cdb). So it looks like I
can use the sg-cdb API to write a cdb-format file directly from Java and
send it to the client(s), which can link with libcdb.a and navigate it
directly.

Whether I can encode my data into the key-value style of CDB (which is a
dbm-like model) is an open question but that's my problem. For the sake
of readers here and subsequent archive searches I thought I'd mention
that the combination of sg-cdb on the server side and tinycdb on the
client side may make a lot of sense for certain applications.

Licensing is also simple: TinyCDB is in the public domain and sg-cdb is
BSD licensed.


I tried to find a post of yours in the thread where you explain what
kind of data structure you need but could not find one. The term
"offset based hash table for ASCII data" is far too generic for me to
get a concrete idea. Can you elaborate a bit or show a sample XML if it
is not too large?

Kind regards

    robert

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