| Re: Iterative interfacing between client and server [message #169938 is a reply to message #169935] |
Thu, 30 September 2010 16:00   |
Captain Paralytic
Messages: 204
Registered: September 2010
Karma:
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Senior Member |
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On 30 Sep, 16:52, Graham Hobbs <gho...@cdpwise.net> wrote:
> On Wed, 29 Sep 2010 11:42:38 -0400, Graham Hobbs <gho...@cdpwise.net>
> wrote:
>
>
>
>
>
>> On Wed, 29 Sep 2010 07:17:14 -0700 (PDT), Captain Paralytic
>> <paul_laut...@yahoo.com> wrote:
>
>>> On 29 Sep, 04:16, Graham Hobbs <gho...@cdpwise.net> wrote:
>>>> On Mon, 27 Sep 2010 07:39:07 -0400, Jerry Stuckle
>
>>>> <jstuck...@attglobal.net> wrote:
>>>> >On 9/26/2010 10:06 PM, Graham Hobbs wrote:
>>>> >> Hello,
>
>>>> >> Am still new at this, need to understand a concept before I start
>>>> >> coding. While the following is an over simplification, at the moment I
>>>> >> am more concerned with a) 'can it be done', b) preparing a design
>>>> >> document, so ..
>
>>>> >> 1. my website will be driven by server pgm php1
>>>> >> 2. client accesses the one page website
>>>> >> 3. client enters/edits data in Forms ( to be javascript edited at
>>>> >> client machine) then submits
>>>> >> 4. pgm php1 receives the form data, passing it to a Windows cmd file
>>>> >> (calling dozens of pgms) for further processing and returning data to
>>>> >> php1
>>>> >> 5. php1 then returns the same page to the client with mostly the same
>>>> >> Form data but with additions and changes
>>>> >> 6. client views the Form data
>>>> >> 7. Repeat 3 thru 7 until client happy with results.
>
>>>> >> So is my concept:
>>>> >> - feasible?
>>>> >> - reflects the way it's normally done (i.e. practical)?
>
>>>> >> Please, thanks in advance
>>>> >> Graham
>
>>>> >It can be done. I don't think it's very practical, though.
>
>>>> ---
>>>> Thanks for your answers. So it can be done but my way is not the way
>>>> to go:-(.
>>>> not very practical - Jerry
>>>> it is a bad idea - Shelly
>>>> not that this makes this idea any better - Capt Para
>
>>>> But am not a lot clearer on the 'best way'. Simplifying I hope,
>>>> suppose a user accesses my one page website, s/he sees unpopulated
>>>> fields (Forms?) for:
>
>>>> Student Number
>>>> First Name
>>>> Surname
>>>> Faculty
>>>> Major
>
>>>> So ..
>>>> 1. The user enters Student Number, clicks Submit
>>>> Server uses Student Number to access an sql table
>>>> Server sends page with first name, surname, faculty, major populated
>>>> goto 1.
>
>>>> Is this a practical web application?
>
>>>> Thanks again
>>>> Graham
>
>>> So you are suggesting:
>>> 1) User submits a request.
>>> 2) Server supplies a response.
>
>>> This is what every web page in the world does and you are asking if
>>> this is a practical web application.
>
>>> I'm sure you can work out that it is.
>> ---
>> Yes to your 1 and 2 and is very clear. That's half of what I asked..
>> What I'm asking is 'can this be an iterative transaction'.
>
>> When I program CICS transactions I give the user a screen, he enters a
>> student number, a CICS pgm presents the results and sends a populated
>> screen; user updates some fields clicks Enter, changes are made to the
>> database, the same screen is represented with an 'update successful'
>> msg, user makes more changes, enter, database update, represent screen
>> etc. Then user enters anew student number and the same process occurs
>> (or user logs off).
>
>> Points are taken with respect to logon ID/password - more scope for my
>> project.
>
>> OK, maybe my original question might have been 'can I pgm in
>> php/html/javascript to emulate such a CICS transaction'?
>> Is this what is being suggested as impractical?
>
> ---
> CP, Jerry, Shelly,
> CICS eh! Am starting to feel at home:-) .. likely you know too what
> copybooks are? I will think to your comments especially about the
> 'cics differences' and will bother you again shortly - sorry .
> Graham
>
> P.S. Have googled, bought a php video tutorial, still not clear on
> 'calls' so a side question if I may:
>
> Being able to call a windows cmd file from my driver php pgm is a MUST
> for my project (enormously larger than the student record system I
> used as illustration) .. but I believe I can call a windows cmd file
> from php and something like this is possible:
>
> - block A of some php code
> - 'call udogen.cmd aparm, bparm' (udogen contains many calls)
> - block B of more php code e.g 'test return code'
>
> i.e. after udogen.cmd has run control returns to block B with a return
> code.
> This would work?
It "MAY" work but as I (and others have said) it is fraught with
potential problems. It really is far better to avoid such calls
completely.
My first posted reply to this question said:
"I'm not sure what you mean by: "to be javascript edited at client
machine", but in general you are describing a pretty standard
approach, until you reach the part that says: "passing it to a Windows
cmd file (calling dozens of pgms) for further processing and returning
data to php1"
It is more normal to perform one's processing in the programming
language of the file that receives the form data. Running "dozens of
[Windoze] programs", sounds like it could be a time consuming task,
fraught with the possibilities that one of them has an error that you
somehow have to handle and return to the user. It is occasionally
necessary to execute a shell program, but most people try to avoid
it."
and no matter how many times you ask that same question, the answer
will not change!
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