Data Persistence

[Brian Milby]

I don’t think you can count on the shutdown message, so you would export on each change.

Arrays can use text for the key, so you could make things easier by using loops and field names.

Thanks,
Brian
On Aug 15, 2018, 4:58 PM -0500, John McKenzie via use-livecode <use-livecode at lists.runrev.com>, wrote:
>
>
> Hello again, everyone.
>
> Jacqueline, I enjoyed the fact you shared your story of not
> conforming to gender stereotypes with your childhood interests. Find it
> sad that science and engineering in general was (is?) considered a boys
> thing.
>
> Feel like I want to inject my two cents worth about software licences
> but it is a topic that could derail the list and I know I should not
> contribute to that. Know I was OK with and understood the off the cuff
> nature of "silly" and definitely do not agree with everything licences
> force upon us in modern times.
>
>
> So I continue to ask questions to help with my data persistence
> problem on Android.
>
> While I want to make sure my syntax is correct I firstly need to know
> if conceptually what I am doing will work/is correct.
>
> On my three cards (each records numbers for a different flight) the
> fields now all save their info to an array, flightArr[], upon
> closeField as suggested by the crowd here on the mailing list.
>
> I have it set-up so that when I stitch to another app (a phone call
> comes in, or I need to look up an airport code using an app, etc) it
> saves the info from each field on every card to a text file and upon
> opening it repopulates those text fields. This is accomplished using
> the handlers on shutdown and on openStack. The change I am going to try
> unless told not to in reply to this message is to encode the array into
> something and deencode it upon openStack.
>
> So each field would have put something into the array upon closeField.
>
> Would it work that upon on shutdown I could just say encode the array
> and then upon openStack I deencode the array and have the commands to
> populate the appropriate fields with their values from the array that
> was just deencoded?
>
> My array is called flightArr[]. Want to check with all of you that the
> syntax I was going to try is correct, although I suppose it does not
> matter if conceptually this is a bad idea. This would be on the stack.
>
> on shutdown
> set the defaultFolder to specialFolderPath("cache")
> put arrayEncode(flightArr) into theEncodedArray
> put theEncodedArray into URL ("binfile:" & theflightArray)
> pass shutdown
> end shutdown
>
> on openstack
> set the defaultFolder to specialFolderPath("cache")
> put URL ("binfile:" & theflightArray) into theEncodedArray
> put arrayDecode(theEncodedArray) into flightArr
> put flightArr[1] into field flight of card 1
> put flightArr[2] into field sta of card 1
> put flightArr[3] into field ata of card 1
> # Etc, etc, for each text field for each card
> end openstack
>
> I see a few things already that make me think it is unlikely to be
> that simple. Also the array probably needs a "[]" after it every time.
> So it is probably embarrassingly wrong and I should spend a little more
> time reading the dictionary before sending this off but I have to leave
> for work in a few minutes.
>
> Thanks for your help.
>
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