Apex Global Variable like D2K

HI,
Previously my application was develop in d2k6i where i use global variable to keep user_id available in every forms...
is it posbile to declare global variable in Apex ?
Thanks
Engr.M.K Chowdhury

Just to extend Andy's point a little further, you may want to look at some of the built in Substitution Strings that APEX offers you right out of the tin:
http://download.oracle.com/docs/cd/E14373_01/appdev.32/e11838/concept.htm#BEIFGFJF
You may find that Oracle provide you with the global value you need but follow Andy's advice for creating your own.
Duncs

Similar Messages

Use of global variables like g_cnt_transactions_transferred in the LSMW

Hi SapAll.
when i had a look at the some of the LSMW's whic use IDOC as the object of uploading data into SAP from external Files i have found in the coding under the step "Maintain Field Mapping and Conversion Rules" that they use some of the global variables like below
.if p_trfcpt = yes or sy-saprl >= '46A'.
EDI_DC40-DOCNUM = g_cnt_transactions_transferred + 1.
endif.
.EDI_DC40-CIMTYP = g_cimtyp.
.EDI_DC40-MESTYP = g_mestyp.
.EDI_DC40-MESCOD = g_mescod.
.if p_filept = yes.
EDI_DC40-SNDPOR = g_fileport.
elseif p_trfcpt = yes.
EDI_DC40-SNDPOR = g_trfcport.
endif.
my doubt is where i can find these variables 'g_cnt_transactions_transferred ','g_cimtyp','g_mescod','g_fileport','g_trfcport' in the LSMW and what is the use of the variable 'g_cnt_transactions_transferred ' in the LSMW.
I have treid to find out the above listed variables looking in step 'Maintain Field Mapping and Conversion Rules' under global variabels list and the other lists also but i couldnt found.
can any one help me in this ?
regards.
Seetha.

Hi Seetha,
In the LSMW Workbench go to the option user menu. And check the option display conversion program.
Now when you execute with the radio button on dislplay conversion program, you ll see the code that got generated in the background while you built your LSMW.
The global variables that you have mentioned are bound to be there in this program generated in the background..
You can put a break point here and see for yourself what the value of these global variables are at runtime.
File port, TRFC port , no. of transactions executed by one run of the LMSW Idoc program , message type are some of the fields that you have asked for .
Regards,
Arun

Unit Testing and APEX Global Variables

We've recently started to unit test our database level PL/SQL business logic.
As such we have a need to be able to simulate or provide output from PL/SQL APEX components in order to facilitate testing of these components.
Some of the most obvious portions that need simulation are:
1. The existence of a session
2. The current application ID
3. The current page ID.
We currently handle requirement #1 by using apex_040100.wwv_flow_session.create_new
We handle 2 and 3 using the apex_application.g_flow_id and g_flow_step_id global variables.
I'm just wondering, how safe is it for us to use wwv_flow_session.create_new to simulate the creation of a session at testing time for those things which need a session?
I've also noticed that there are apex_application.get_application_id and apex_application.get_page_id functions whose output is not tied to the global variables (at least in our current version).
Is it safe for us to expect that we can set these global variables for use in testing or is apex moving to get_application_id and get_page_id functions away from global variables?
Will there be corresponding set_application_id and set_page_id functions in the future?
Sorry for the question bomb. Thanks for any help.

My first question would be why do you need to establish a session to test your PL/SQL?
wwv_flow_session is a package internal to APEX, and you should probably leave it be.
The get_application_id procedure you refer to is in apex_application_install, which is used for scripting installation of applications - not get/set of page ID like you're describing.
If you're uncomfortable using apex_application.g_flow_id, you can use v('APP_ID') or preferably pass the app_id/page_id as parameters to your procedures.
Your question seems to have a few unknowns, so that's the best I can describe.
Scott

Apex- global variable declaration

Dear Friends
I am very new to Oracle applicaiton express,
Please let me how to declare global variable in an applcation. The variable should be accessible throught ot all the pages in that applicaion. Any one can help?

Hi,
use an application item for that purpose.
Just navigate to Shared Components->Application Items and create what you need.
Regards,
Moritz

APEX :-Global Variable

HI,
Can someone please let me know the steps how to handle below requirment.
Our requirement is when we select language in the select list in HOME page, the value need to pass global, because few of the LOV’s are using this variable.
EG: DE,FRA,EN (Showing in the select list)
LOV Query:
case when :sprache = 'fra'
then 'Afficher tout'
else 'Alle anzeigen'
end as text
from dual
Thanks in advance.
Prabhat

Create an application-level Item
See http://docs.oracle.com/cd/E37097_01/doc/doc.42/e35125/bldapp_item_app.htm#HTMDB29095

Can LabVIEW global variables be shared between UUT sequence steps in the parallel sequence model?

Sorry for this simple question, I'm having a hard time finding this answer.
If I launch a sequence to run on two UUTs in the parallel sequence module, can I get both UUTs to run LabVIEW vis that use global variables such that :
1) UUT 0 executes 20 LabVIEW Vi steps asynchronously, 5 of which access data from LabVIEW global variables A, B, C (Strings)
2) UUT 0 executes the same 20 LabVIEW based steps asynchronously 5 of which access data from then same LabVIEW global variables A, B, C (Strings)
I am a little worried that using file globals may have some delays or more of a race condition than using native LabVIEW global variables like in a single labview application perform.
QUESTION 2: Are file globals actually written to the hard drive and shared between parallel sequences through file transfer? OR are they in memory?
Brad Whaley
LabVIEW Certified Engineer

Hi bdwhaley,
Are your parallel sequences only reading from the global variable? Or are they writing to the variable as well? If it is just reading, then you should be okay. File globals are read from memory. Every time they are read, a copy of the data is made in memory.
Humphrey H.
Applications Engineer
National Instruments

Substitiute for Global variable

i have a doubt if we can use anything other than a Global variable like:-
:global.<var_name>
for a variable i define at the form level, say 'When-new-form-instance' trigger and use it at block & item level.
In a big application, there is a doubt of using a Global variable twice.
Regards.

Hi,
Decalre a variable in an package specification and use that for your purpose.
Global variables are good and bad at the same time. Once declared the live for the whole session. Each of them occupy 255 bytes of memory, so it's bad practise to use them heavily. Instead you can use the same variable again and again, but be aware: Since they keep their value they could lead to undesired behaviour unless you are careful and null's them (or give them a default value) each time you have used them. Often I capture their value in the pre-form trigger, store the value in a package variable within the form, and then give the global a value of '-1' (which is my default).
/Michael

Find and replace global variables

Hi there,
I've ran into a mess with my global variables. While I was trying to rename one of the globals, all instances in hundreds of subvis turned corrupt. The icon of the global variable turned black and the wires starting at the variable became broken. The amazing thing is that the black icons seem still to be linked to the correct global variable. If I leave the mouse cursor on the icon, the correct file path appears in the context help window. If I double click on the corrupt icon, the correct vi is opened. I tried "Save as" and "Rename" with various options. LabVIEW seems to browse through all affected vis but the icons remain broken. My last hope was to run the "Find and replace" tool (Ctrl + F), but it doesn't work for global variables for some unknown reason, unfortunately. Compare
http://forums.ni.com/ni/board/message?board.id=170&message.id=438450&query.id=2151294
Is anybody out there who has a useful hint?
Peter

stoeckel wrote:
Hi there,
thank you all for your contributions. We were able to solve the problem in the meanwhile. Why did nobody point us to the fact that the icons of global variables turn black if the name of the control on the panel of the variable does not match the selected name inside the icon?
The LabVIEW compiler would have told you that right away. If you click the broken run arrow on the situation you will get the message:
An item with the specified name could not be found. Select a different item from the list.
Seems pretty straightforward to me. But then, perhaps it's because I've been using LabVIEW for some time.
If somebody just quietly mentions the existence of "global variables" he or she will usually be soused with flout and bashed by the proven active veterans. But why's that? Global variables can provide an easy way to communicate a "stop" information throughout all running vis. As long as there is just one writer and many readers, there is no danger that it comes to "race conditions".
If global variables are really so nasty as is often said, why does National Instruments still provide them within LabVIEW??
I don't want to get into yet another global variable debate here. The only comment regarding global variables made in this thread was a tongue-in-cheek comment I made. I was not dissing global variable. In fact, I use them quite often. Global variables, like every other programming construct ever invented have their use. The main reason you will see the so called "proven active veterans" go crazy over global variables is that they constantly see them being abused, causing race conditions, and then have to listen to newbies complain that their program doesn't work and LabVIEW sucks, when it's really their programming skills that's the real problem. But that's just my opinion.

Can not use Global Variable in Event Structure

I am using LabVIEW 2009.
In my LabView project I have a Boolean Global variable called EStop. I can read and write the Global variable. If I double click on the Global variable, it takes me to EStop.vi which includes a Text Button. EStop.vi is part of my Project.
In one of my VIs, I have an Event Structure. If I go to one of the Event Handlers in that Event Structure and right click and then select Add Event Case, I get a list of possible events. But that list does not include EStop or an EStop events.
I want to Add an Event Case for EStop: Value Changed.
Why can't I Add events to an Event Case that include events on Global Variables like value changed?
How do I add EStop: value changed event to my Event Structure.
Solved!
Go to Solution.

dbaechtel wrote:
I have many events throughout the system that might need to cause the system to do an Emergency Stop action. So I want ro use a Global variable that is accessible from anywhere in the system. Any action or condition that occurs anywhere in the system can activate the emergency Stop condition by setting the boolean EStop Global variable to True. When the Global bolean variable goes true(value changed), I want to detect that event in an Event Structure and do the actions necessary to accomplish a system Emergency Stop.
Sorry, I am not familiar with your terminologies. What is your definition of a "system".
One big VI with many parallel loops?
Several VIs running in parallel?
LabVIEW Champion . Do more with less code and in less time .

Global variables for circular buffer

Hallo!
I have another question:
I need to have a variable circular buffer size. So I would like to define the circular buffer size by a global varable.
Is that possible? I tried to use the global variable like {VAR_01} to insert in the desired field for circular buffer size, but dasylab only puts a zero in the field.
Thank you and have a nice day.
Hilby
Solved!
Go to Solution.

Unfortunately it is not possible to have a variable-sized buffer. Right-click into the corresponding textfield: the context menu does not show an entry to choose the global variable from a list.
M.Sc. Holger Wons | measX GmbH&Co. KG, Mönchengladbach, Germany | DASYLab, DIAdem, LabView --- Support, Projects, Training | Platinum National Instrument Alliance Partner | www.measx.com

Apex 3.2 - Global Variables loosing value!

Hello Everyone,
I am using Oracle Apex version 3.2. I am using global variables in my queries.
I found that some times but not always these global variables loosing their
value. How I can resolve this issue?
All replies will be appreciated. Thanks in advance for your replies.
-Parveen

Hi, thanks for your answer.
The king of caché I was talking about is something like this:
* I get a table record (rowtype) from a query accesing the table by PK.
* I store the value of my PK and the record I got in PL/SQL and go back to the app.
* Then, if I need to get another record from my table accesing by PK I compare the PK value I got in memory:
- It is the same value: return the record (in this way I don't have to query my table).
- It isn't the same value: query the table with the new value and store the record and the PK value.
It is easy to do this in applications like Forms or .NET, but can I do it with APEX?
Thanks.
Johann Alexander Quintero
Cali, Colombia.

APEX: Declare global variable in APEX

Hello All,
Can anyone tell me how to declare global variable in Process(Pl/sql code) in Oracle APEX.
Thanks,
Jiten

There is nothing like Global Variable that can be declared in Process in Apex.
Look up Shared Components > Application Item. Maybe that is something that meets your requirement.
Alternate, use Page 0 items.
Regards,

Apex User as Global Variable

Hi
Is there any Way to catch the Apex User as System or Global Variable for using it for auditing for example
br.
MDK.

Hi,
There is APP_USER substitution string
http://download.oracle.com/docs/cd/E17556_01/doc/user.40/e15517/concept.htm#sthref166
I hope it is what you looking for
Regards,
Jari

Setting the value of an Application Item (setting a global variable);

In APEX 3.2.0.00.27, I need to initialize a global variable to 0 to implement a variable for testing to see if anything on the page has changed. Will update to 1 when certain select lists on the page are changed. Have read through some similar questions and replies within the forum as well as other blogs and sites. So, I believe what I am doing is the way to go about this. Unfortunately, my initialization of an application item/global isn't happening yet. here's a rundown of what has been implemented:
1) created an application item, G_CLASSIFICATION_ID_NEW in the shared components;
2) created Javascript (JS) function called by addLoadEvent in the page html header region so when the page loads, the G_CLASSIFICATION_ID_NEW global/application item should get set to 0 with the following JS and using AJAX and htmldb_GET:
<script type="text/javascript">
function initVars()
alert("before get initvars");
var get = new htmldb_Get(null,$x('pFlowId').value,null,22);
get.add('G_CLASSIFICATION_ID_NEW', 0);
gReturn = get.get();
if(gReturn){
alert(gReturn.value);
get = null;
alert("after get initvars");
alert("before call to initpage");
addLoadEvent(initVars());
</script>
I've used the htmldb_Get with success for populating other global variables and running On Demand Processes with onchange JS calls in the html form element attributes within select lists on the page. Afterwards, I can check the globals via the Session window and searching on Application Items. Unfortunately, I'm missing something because my G_CLASSIFICATION_ID_NEW never gets populated when I load the page. The alerts all popup when the page is loaded, so I know the script is being executed when the page loads. the alert(gReturn.value) comes back undefined. And, needless to say, the G_CLASSIFICATION_ID_NEW to 0 is not occurring.
I've tried the htmldb_Get with it calling an application process and without (set to null). From what I've read, you shouldn't need to call an on demand process to have the get.add set the global variable. Then again, this could be where I'm going wrong. however, as I've mentioned, this works for other functions called from an onchange to populate an application item, but the page has already loaded when the onchange(s) get executed. They may work because the page is already loaded when the onchange is called. My point here is that my other On demand processes are NOT setting or changing the global variables at all. The globals are getting set with the get.add(<app item>, <value>) portion of my other JS functions within the HTML Header region. So, I'm inclined to believe that I don't need the 'application_process=<some_odp>' parameter set, but if that's not true, please let me know. if so, what would need to be in the on demand process--ie, what would be the purpose of the get.add(<application item>, <value>) if I set the global variable in the on demand process because that's the only thing I could think of doing within an on demand process for this?
If somebody can point out what I'm not understanding or failing to do here, that would be great. I'm doing fine with APEX, but wouldn't consider myself a guru with it just yet. I'm definitely not a JS/AJAX guru, and when things like this go astray, I get bogged down because I'm not sure of the problem. So, I'm hoping you gurus who monitor this forum can get me going in the right direction.
thanks,
bob

Hi Jari,
Does that javascript work if you place it some of region footer on page 22 ?Yes. I cut it out of the html header of the page, and put it in the footer of the first region on the page. It initializes the variable. Putting it into the footer of the first region on the page should work for me instead of having an extra region on the page that's being picked up from page 0.
Is your page 22 authentication public ?No. This particular page is set for an ADMINISTRATOR only. That said, I am logged in as an administrator. So, I cannot see why setting authentication should make a difference as long as I have that authentication/authorization. Also, there will be other pages where I want to use this script or a similar script, but again, those pages will not be open to the public. the authentication will be "role" based where a user will not necessarily have to be an administrator, but they will have to have a certain role to access the page. Is there a known problem or something that precludes a html header JS script from doing an addloadevent when authentication is NOT public?
thank you,
bob

How do i create and pass a global variable from one vi to several sub-vi's?

Hi Guys,
I am trying to create a program that opens several front panels (sub-VI's) in sequence. in each front panel, the user would open a file that the name is obtained from the previous sub-VI. I would like to know how i could pass the filename and refnum of the file thorough from one sub-vi to another. A global variable would do it in VB, but how do we do global vars in LABWIEW. thanks
Papish

I put together a sample VI and Sub VI that illustrates how to pass a Refnum and access a data file while in a Sub VI.
For multiple VIs just repeat the sub VI process.
You probably don't wanna use a Global Variable if not needed (can add to the mess down the road haha).
Let me know if it helps you out! Or if I can clarify anything else!
Chances are if you have seen VI in the forest it hasn't fallen.
Attachments:
Passing Refnum.zip ‏21 KB

Apex Global Variable like D2K

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