[REBOL] Re: Object Database
From: louisaturk:eudoramail at: 11-Apr-2001 1:47
Dear Carl,
I am amazed that such a small amount of code can do so much, and also that
the creator of this language himself would help me like this. Many thanks!
I have some questions. I have been studying your code carefully trying to
learn how it works. I've been on this list for quite a while, but have
only recently taken time to buy Ralph's book and Elan and John's book to
really get serious about learning the language. I'm a real beginner, so
please excuse me if my questions betray that fact.
So far I have figured out how to use your functions to enter data into a
record, and then save it to a file. By entering "print read %data.r" at
the command line, I am able to see that I have entered the data
successfully. So I think I understand how to use insert-data and
save-data. However, when I type load-data I get an error message ("blk
has no value"); what am I doing wrong? Also, I assume that I must learn
how to get load-data to work before find-data and remove-data will work;
but to keep from having to ask you later, how are these two functions used?
I want to use this database for an email list. Most of the data remains
the same, but email addresses change often. Sometime I do not even have a
name---only an email address that has to be removed or changed. How do I
change an email address?
You say:
> If you expect to grow this database to a large
>size, you will want to MAKE HASH! the database when you load
>it.
Will this modification do it?:
>load-data: has [data] [
> data: make hash! load/all db-file
> clear database
> foreach item blk [
> item: make record item
> repend database [item/email item]
> ]
>]
Will your code work with Rebol/View also? Am I correct in assuming that
View would be ideal for creating a user interface for the database?
Many thanks for your help, and for creating a truly exciting language.
Louis
At 08:28 AM 4/9/2001 -0700, you wrote:
>What!? You just want us to just whip out an object database, eh? ;)
Well, I wasn't expect anyone to whip out one especially for me,
