On May 31, 2007, at 1:55 PM, J. Landman Gay wrote:
Or you could store it in a text file and just read that in. In any
case, it's all the same approach; store the data as a single text
variable. With this method, you use offset() or lineoffset() to find
the record(s) you want, and use a display card to load in each record
as needed. The display card would have the same number of fields as
record items (40 in your case) and parse out the record data to fill
each field appropriately. You need to write your own navigation
commands with this method, re-filling the fields with the next or
previous line of data on demand. When the user changes cards, you need
a closeCard handler that gathers the field data, inserts appropriate
item delimiters, and writes it back to the correct line in the text
variable.
This is the method I used for a 40,000 record data set. The data was
stored in a text file on disk and the application was only a single
card that displayed the current record. This has the advantage of
keeping the data separate from the interface, and the client only
needed to backup the text file.
I am very new at using Revolution but I am a long time HyperCard
user & still use it.
Like you said the data could be stored in a text file. In HyperCard
one problem with
storing the data in a field was the field had a limit of around
32,000 chars. But this
could be overcome by creating new fields as the database grew and
deleting them
if it decreased. The find command from hypercard would do the job
pretty fast.
My question about Revolution concerns field limits. I haven't read
anything about
a character limit. Is there a character limit in Revolution Fields.
If there isn't one
that is actual is there one that is practical. At what point doe
the find command get
too slow while searching a field or other things like sorting etc.
thanks,
-=>JB<=-
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