Re: IWS Large Character output support -- WEB400

Jon, you could use length fields for character fields. Some applications
have character fields with large lengths, and IWS trims trailing blanks,
and thus for these types of fields it could degrade performance.

However, I do agree that varchar would be much cleaner.

"WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx> wrote on 08/13/2019 10:29:06
AM:

From: Jon Paris <jon.paris@xxxxxxxxxxxxxx>
To: "Web Enabling the IBM i (AS/400 and iSeries)"

<web400@xxxxxxxxxxxxxxxxxx>

Date: 08/13/2019 10:37 AM
Subject: [EXTERNAL] Re: [WEB400] IWS Large Character output support
Sent by: "WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx>

If you are not using an array how can the parameter vary in length?
If it is a character field and you want to restrict the output
length why not use a varying length field?

On Aug 13, 2019, at 11:18 AM, Ric Turner <rturner@xxxxxxxxxxxxxxx>

wrote:

Thanks Jon, I will try to resolve this using your suggestion but I

am not using an array so this may be tricky. Thx

Thanks,
Ric Turner
JANO Technologies, Inc.
601.362.7601 ext. 224
800.250.9884 ext.224

The preceding e-mail is privileged and confidential and is

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-----Original Message-----
From: WEB400 <web400-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jon

Paris

Sent: Tuesday, August 13, 2019 10:13 AM
To: Web Enabling the IBM i (AS/400 and iSeries)

<web400@xxxxxxxxxxxxxxxxxx>

Subject: Re: [WEB400] IWS Large Character output support

You may have the same problem I did Ric. Take a look at these two

interfaces:

This one works and the _LENGTH field is omitted from the output.

dcl-pi RestSrv5 ExtPgm;
requestedCat Like(catcod);
result char(20);
productList LikeDS(productList_T);
end-pi;

Dcl-ds product ExtName('PRODUCT') End-ds;

Dcl-ds productList_T Qualified Template;
products_LENGTH int(5);
products LikeDS(product) Dim(20);
End-Ds;

I think my original attempt looked like this - and it does as you

describe and includes the _LENGTH in the output;

dcl-pi RestSrv5 ExtPgm;
requestedCat Like(catcod);
result char(20);
products_LENGTH int(5);
products LikeDS(product) Dim(20);
end-pi;

Dcl-ds product ExtName('PRODUCT') End-ds;

To men the documentation implied that the _LENGTH had to be

_among_ the parameters whereas in fact it has to be _within_ the
parameter to which it relates.

On Aug 13, 2019, at 11:01 AM, Ric Turner <rturner@xxxxxxxxxxxxxxx>

wrote:

Yes, I have the detect fields box clicked and my IT folks tell me

the latest PTF's are installed. For some reason it displays the
_LENGTH parm when redeploying the service and I was not expecting
that. My understanding is that it should not appear in the list of
parms but be detected by the IWS as a field only to define the
length to speed things up.

Thanks,
Ric Turner
JANO Technologies, Inc.
601.362.7601 ext. 224
800.250.9884 ext.224

The preceding e-mail is privileged and confidential and is

intended only for the named addressee. If you received this message
in error, please delete it and notify the sender by return e-mail or
by phone at the numbers noted above.

-----Original Message-----
From: WEB400 <web400-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Nadir
Amra
Sent: Friday, August 9, 2019 9:26 AM
To: Web Enabling the IBM i (AS/400 and iSeries)
<web400@xxxxxxxxxxxxxxxxxx>
Subject: Re: [WEB400] IWS Large Character output support

Have you enable "detect field lengths" option? Do you have

latest HTTP group PTF?

FYI, the article was written prior to varchar[1] support.

varchar would also work in this case as well.

[1]

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki

/dW%20IBM%20Integrated%20Web%20Services%20for%20i/page/Support%20varia

ble%20length%20fields

"WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx> wrote on 08/09/2019
07:42:43
AM:

From: Ric Turner <rturner@xxxxxxxxxxxxxxx>
To: "WEB400@xxxxxxxxxxxxxxxxxx" <WEB400@xxxxxxxxxxxxxxxxxx>
Date: 08/09/2019 07:42 AM
Subject: [EXTERNAL] Re: [WEB400] IWS Large Character output support
Sent by: "WEB400" <web400-bounces@xxxxxxxxxxxxxxxxxx>

Hi All,

We have found an article that addresses speeding up the SOAP web
service when large character fields are used to return data to the
consumer (titled: Integrated web services server for IBM i updates

website: https://www.ibm.com/developerworks/ibmi/library/i-
integrated-web-services-server/index.html ).

Below is an excerpt from the article:

Enable improved processing of very large output character fields
Length field support has been extended to character fields. Output
character fields that are very large (I am talking about 1000s of
bytes) take time to process because the determination of the size of

the string to return is done by traversing the field a byte at a
time, from right to left, looking for the first non-blank character.
To improve the processing of these large character fields, you can
specify an integer (int) field length that immediately precedes the
character field with the same name as the character field appended
with _LENGTH (similar to what is done when processing output arrays
with field lengths). If the field length exists and Detect length
fields is selected, the traversing of the field to determine the

size

is not performed, improving performance. In addition, the length
field is hidden from the client and is not returned in the

client response.

My question to the group is - Has anyone tried using this approach?

I have coded my SOAP web service (I am the provider) using this
approach only to find that it does not work as outlined in the
article. I am running this on a v7.2 machine and it is written in
RPGLE as a program (not a service program).

When I perform the redeploy of the service all 3 parameters are
displayed (including the _LENGTH parm), but I was expecting only 2
parameters to appear (excluding the _LENGTH parm).

Here is the RPGLE code from my program:

D WSCASEINQ PR ExtPgm('WSCASEINQ')
D CASE# 13A
D courtcase_LENGTH...
D 10i 0
D courtcase 500000a
D WSCASEINQ PI
D CASE# 13A
D courtcase_LENGTH...
D 10i 0
D courtcase 500000a

The whole idea is to not return the _LENGTH parm to the consumer.
There is no example in the article, it just states that this

approach

works like the approach used for the array.66

Does anyone know what I am doing wrong to not be able to take
advantage of this approach? Any assistance is greatly appreciated.

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