On May 31, 2007, at 3:55 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.
Here is an example of this method. I use this to customer data and
registration information. Once can easily modify it to match their
needs.
<www.canelasoftware.com/pub/rev/Key_Maker.rev.zip> I removed some
code that makes our key system work. The rest is there for dissection.
It is commented pretty well and is very basic to get someone
started. I have been using it for years and have never had any
problems with the integrity of the data. I tested with with dummy
data in the amount of 100,000 records. It held up just fine.
The data is stored as a text file for easy import into another DB
system. I am sure it can be improved in many ways. Hope it helps
someone just starting out.
Mark Talluto
--
CANELA Software
http://www.canelasoftware.com
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