* Disk-based or db-based associative array -- good or bad?
@ 2003-03-26 1:50 William Park
2003-03-26 10:31 ` Peter Stephenson
2003-04-18 22:56 ` Clint Adams
0 siblings, 2 replies; 4+ messages in thread
From: William Park @ 2003-03-26 1:50 UTC (permalink / raw)
To: zsh-workers
I just wanted to ask shell experts here. Is disk-based associative
array a good thing to have for a shell? That is, reading and writing
like normal in-memory array, ie
typeset -A var
var[aa]='bb'
echo ${var[aa]}
except that 'aa':'bb' key:value will be written to and read from db file
(either Gdbm or Berkeley BD) on disk.
I'm sure other people have thought about this before me, and am
wondering why this hasn't appeared in Zsh or other shells. Noteable
features are
- data survives exit, logout, and shutdown
- variables can be shared between shell processes
- it's not SQL
--
William Park, Open Geometry Consulting, <opengeometry@yahoo.ca>
Linux solution for data management and processing.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Disk-based or db-based associative array -- good or bad?
2003-03-26 1:50 Disk-based or db-based associative array -- good or bad? William Park
@ 2003-03-26 10:31 ` Peter Stephenson
2003-04-18 22:56 ` Clint Adams
1 sibling, 0 replies; 4+ messages in thread
From: Peter Stephenson @ 2003-03-26 10:31 UTC (permalink / raw)
To: zsh-workers
William Park wrote:
> I just wanted to ask shell experts here. Is disk-based associative
> array a good thing to have for a shell? That is, reading and writing
> like normal in-memory array, ie
> typeset -A var
> var[aa]='bb'
> echo ${var[aa]}
> except that 'aa':'bb' key:value will be written to and read from db file
> (either Gdbm or Berkeley BD) on disk.
As an add-on module this would be a very good thing to have. It would
fit in well with existing modules such as zsh/parameter and zsh/mapfile.
One problem at present is we don't have a way of associating a parameter
with a particular implementation. I think something from ksh93 would do
this. Otherwise we can define some `tie'-like syntax for typeset.
--
Peter Stephenson <pws@csr.com> Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK Tel: +44 (0)1223 692070
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Disk-based or db-based associative array -- good or bad?
2003-03-26 1:50 Disk-based or db-based associative array -- good or bad? William Park
2003-03-26 10:31 ` Peter Stephenson
@ 2003-04-18 22:56 ` Clint Adams
2003-04-18 23:26 ` Clint Adams
1 sibling, 1 reply; 4+ messages in thread
From: Clint Adams @ 2003-04-18 22:56 UTC (permalink / raw)
To: zsh-workers
> I'm sure other people have thought about this before me, and am
> wondering why this hasn't appeared in Zsh or other shells. Noteable
> features are
> - data survives exit, logout, and shutdown
> - variables can be shared between shell processes
> - it's not SQL
See the thread from Sep/Oct 2002 with subject 'db module'.
Starts with http://www.zsh.org/mla/workers/2002/msg01153.html
^ permalink raw reply [flat|nested] 4+ messages in thread
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2003-03-26 1:50 Disk-based or db-based associative array -- good or bad? William Park
2003-03-26 10:31 ` Peter Stephenson
2003-04-18 22:56 ` Clint Adams
2003-04-18 23:26 ` Clint Adams
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