Sql problem

William Prothero waprothero at gmail.com
Tue May 23 20:10:08 EDT 2017


Andre,
This is good advice. I did it this way as a shortcut for an app I’ve built for myself only. You are right that it makes debugging harder because I can’t use other management applications to examine the contents. 

For many years now I’ve used php cgi’s to connect to the remote mysql db and it works well. I just haven’t spent the time to set up JSON. 

But it looks like I could dispense with the php and directly access the mySQL db from my mobile app, without a cgi?

Best,
Bill

> On May 23, 2017, at 3:30 PM, Andre Garzia via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> William,
> 
> If I may add a bit of personal opinion here... so, I have been using and
> storing LC stuff in databases for a long time. Not only I have been storing
> arrays in database but I had them flying over TCP sockets and being
> decoded/encoded as needed. For a long time I used the same approach as you,
> which is to arrayEncode + base64 the array.
> 
> I don't do that any longer. That combination is very hard to debug. I would
> advise you simply to use JSON and store it as JSON on the db. Instead of
> encoding the array twice, you do it only once with jsonexport() and then
> when importing, you do it only once with jsonimport()
> 
> Not only that reduces complexity but it also makes it a lot easier to
> debug. As a bonus, your data can be consumed by other applications which
> are not based on LC which may open a whole ecosystem of plugins and
> interoperation to your product.
> 
> Cheers
> andre
> 
> 
> On Sun, May 21, 2017 at 9:45 PM, William Prothero via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> 
>> Never mind. I got it working. I’m not exactly sure about the problem
>> because the method I used should have been quite general. However, what
>> made it work is that I had the contents of a list field in the array I was
>> storing and that somehow caused an error when I tried to decode the array.
>> I deleted that array key, because there was no reason I needed to have it
>> in the db anyway, and it worked.
>> 
>> I’ll look into why and report back if I find anything interesting.
>> Best,
>> Bill
>> 
>>> On May 21, 2017, at 5:23 PM, William Prothero via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>> 
>>> Whoops, I lied.
>>> The data is stored incorrectly in the simulator too.
>>> Hmm….
>>> The IDE stores it correctly. There is something in the encoding that I’m
>> missing.
>>> Bill
>>> 
>>>> On May 21, 2017, at 5:03 PM, William Prothero via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>>> 
>>>> Folks:
>>>> I have an app that stores data to a mysql database on my server. It
>> works fine in the IDE and in the iPhone simulator. However, when I load the
>> app onto the iPhone, the saved data is corrupted.
>>>> 
>>>> I am saving an array. The array is saved in a big string that has been
>> base64 encoded.
>>>> 
>>>> When saving, I do:
>>>> 
>>>> put arrayEncode(tArray) into tData
>>>> 
>>>> put base64encode(tData) into xData
>>>> 
>>>> put urlEncode(xData) into xData
>>>> 
>>>> xData is sent to the db
>>>> 
>>>> When I read back the data, I do the inverse:
>>>> 
>>>> urlDecode
>>>> base64Decode
>>>> arrayDecode
>>>> 
>>>> The base64 data on the db is different when I store it from the iPhone.
>> I can see this with Navicat, which I use for db management. So, the problem
>> is in the storing of the data.
>>>> 
>>>> What the heck? I am just using a post command to a php script that
>> writes to the db.
>>>> 
>>>> Why would the iPhone data that is sent be different from that sent in
>> the simulator?
>>>> 
>>>> Mac OSX 10.12.4, Livecode 8.1.4 (rc2) and XCode 8.3.
>>>> 
>>>> Any suggestions would be welcome.
>>>> Thanks,
>>>> Bill P.
>>>> 
>>>> William A. Prothero
>>>> http://earthlearningsolution.org/
>>>> 
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> 
> 
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