Re: Reading and writing records
Re: Reading and writing records
- Subject: Re: Reading and writing records
- From: Chris <email@hidden>
- Date: Sat, 25 Aug 2007 08:17:44 +1000
has wrote:
Chris wrote:
I know how to read and write a list of records to a file using the "as
list" qualifier.
[...]
Does anyone have a code snippet for writing a list of records one at
a time and reading them back one at a time until eof?
You don't. You slurp the whole list into memory and work on it there.
(This is not to say it's impossible, just a very bad idea.)
A more useful question would be: what are you trying to achieve (i.e.
what's the script's purpose)? e.g. If you're needing a persistent,
filesystem-based data store that allows random access, then using
Standard Additions to read and write serialised AppleScript data
structures is really the wrong tool for the job and there are much
more appropriate solutions that you should look into (plain text
files, XMLLib.osax, System Events' Plist Suite, Database Events,
FileMaker Pro, PostgreSQL, etc.).
For this particular case, I'm wanting to transfer playcounts in iTunes
between different computers. So I don't need random access. The file is
short lived. And I don't really see the point of slurping tens of
thousands of records into memory when I don't need more than one at once.
Can anyone give me a code snippet for testing for eof while reading
records? A simple thing that my applescript book doesn't cover.
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