RE: Finding data between XML tags using SQL

John,
I agree with many of your comments.
I do prefer SQL over traditional F spec and RLA/Chain/Setll/Reade,
Especially with free format which makes the code less "convoluted",
to my eyes.
I don't enjoy the additional hassle of the required DS, but it does
seem to make rpg more like other languages, so that actually makes
sense to me and the advantage I often see is I get all the data
I actually need in "one I/O", so I think you may be ignoring how
productive embedded SQL can be.


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John E
Sent: Wednesday, June 18, 2014 7:17 AM
To: Midrange Systems Technical Discussion
Subject: Re: Finding data between XML tags using SQL

I see this trend.... and i don't like it.

Use SQL for all kind of things, just because it's "built into" SQL.
SQL is for data definition and manipulation.

Just because, like many things in IT, SQL is constantly "improved" and nowadays you can do about "everything" with it, especially compared to RPG, like all kinds of date checks and manipulations, does not mean you should.

For example, suppose you want an easy way to add work days to a date.
In RPG there is nothing "built-in" for that.
In SQL there is some calendar functionality built-in. Should you use it?

I would - always - prefer to implement it in RPG, in RPGIV that is, but nicely wrapped up in a procedure in a service program. Maybe initially it's more time to implement than just add some SQL code and change the member type to SQLRPGLE (just because of some trivial functionality, which convolutes the source IMO). Mostly it's quite trivial to implement, IMO.
However, the end result is much more readable: newdate = AddWorkdaysToDate(olddate).

So, iff you really want to do this with SQL, then put it into a procedure so the next guy (who maybe is not such an SQL expert to immediately see what's going on) doesn't have to delve into the SQL books just to find out what's happening.

Using SQL for these kind of things, like consuming web services for example, is for one-off things, not for your production code that needs to be robust and adaptable etc etc. And there will be a time that that little SQL code snippet which was so handy can't be changed to support changing needs, and so has to be thrown out as a whole to be replaced with straight code, which it should have been from the beginning. There is a whole mechanism that kicks in when you change RPGLE to SQLRPGLE, just to "quickly" implement some basic functionality.

It's like using the CPYTOIMPF command in production code, what is see regularly, and then telling the customer "no we can't format the date that way because CPYTOIMPF doesn't support it". Writing to a CSV file is trivial. Make a program once, and use it again and again and have all the flexibility you need now and in the far future. But what i see in practice is that CPYTOIMPF is used, simply because it "fits" the requirement at that moment. Until it does not... It's meant for quick fixes, for us command line jockeys, not to be used in production software.


IMHO, of course











On Tue, Jun 17, 2014 at 7:29 PM, Alan Shore <ashore@xxxxxxxx> wrote:

I was hoping to use a "quick" SQL query and there are a multitude of
different formats

Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Jon Paris
Sent: Tuesday, June 17, 2014 12:57 PM
To: Midrange Systems Technical Discussion
Subject: Re: Finding data between XML tags using SQL

Why don't you just use XML-INTO to parse the value in the variable?


On 2014-06-17, at 11:02 AM, Alan Shore <ashore@xxxxxxxx> wrote:

Thanks Carel
Forgot about that SQL command
Let me ponder this for a while

Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf
Of Carel Teijgeler
Sent: Tuesday, June 17, 2014 10:57 AM
To: Midrange Systems Technical Discussion
Subject: Re: Finding data between XML tags using SQL

You could try the LOCATE function in the WHERE-clause

Regards,
Carel Teijgeler

On 17-6-2014 15:18, Alan Shore wrote:

Hi everyone
Before I forget - we are on V5r4

For order settlements, we use a web service with XML Each
transmission (XML request and XML receipt) is stored in a file

My question is (hopefully it makes sense) Using SQL - how can I
display (via SQL) the data between XML tags (including the tags)
For example - if I supplied the XML tags of for the XML RESPONSE
<range> and </range>

I would want the following displayed

<range>0</range>
Etc.
For all the records
Hope this makes sense
I am having trouble trying to think where to start

As always - all answers gratefully appreciated

Anyone
Alan Shore
E-mail : ASHORE@xxxxxxxx
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
'If you're going through hell, keep going.'
Winston Churchill


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www.partner400.com
www.SystemiDeveloper.com




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