Copying Global variables

Is there any easy way to copy a group of global variable from one job to another? I know I can insert the global variables one at a time but there must be a quicker way????

Hi Richard,
You might be interested in a new feature in the 12.0 release of Data Integrator (it's built on the Data Services XI 3.0 platform). The feature is called "substitution variables", and allows you to have a single set of variables for a runtime environment. They are static in nature (meaning you cannot change their value after you launch a job) but you can have different configurations of variable assignments. You control all of this using system configurations -- it's a lot like using datastore configurations with system configurations today, except that you can define sets of substitution variable values to go along with a specific system configuration.
You may want to talk to your account manager about migrating your license to an XI 3.0 license. Also, the first service pack for 12.x will be released soon (Septemberish?), which is a good indication that the tool is ready for serious production usage.
Thanks,
~Scott

Similar Messages

Java Threads vs. Native Global Variables

A brief description of the problem:
I am trying to integrate a multi-threaded Java app with legacy Fortran code. The Fortran code in question makes extensive use of global variables in the form of Fortran's Common Block data structure.
If multiple threads were allowed access to a native routine, they would over write each others data which is stored in global variables.
If only one thread at a time can have access to the native routine for the duration of the native routine, the whole advantage of using threads is completely nullified.
These native routines cannot be rewritten (3rd party code) and must be used.
One solution I envisioned was to load a new copy of the native shared object code for each Java object that used the native code. However, it seems System.loadLibrary() can only be used in a static context.
Is there any known solution to this problem?

Here is an elaboration on the earlier suggestions. It's a high overhead solution, because you have to start a bunch of JVMs.
1. You have a java control program, which will start up a pool of "services", make requests to them, and gather the results.
2. Each service is a small java program with a native method:
o java communications front-end.
o native method declaration.
o native - in your case fortran - method implementation.
3. Each service is started using "exec". That puts it in a separate process.
4, Since each service is a java program, you can use java to do communications between the control program and the service.
o You could use RMI.
o You could - perhaps - use java Process communications, i.e., have the services write to stdout, and have the control program capture the output.
o You could use socket communications.

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

How to declare a global variable from a PL/SQL package

Hi All,
Using a global variable is a bad practise for all language. However, in my case, I have a PL/SQL package defines all constants, and I want to use them directly via SQL statement, for instance,
PACKAGE my_const
IS
     DEFAULT_ZIP_CODE CONSTANT VARCHAR2(5) := '00000';
END;And I cannot referrence this variable from my select statement as
SELECT my_const.DEFAULT_ZIP_CODE from dual;I have to create a function via my package, as,
FUNCTION get_default_zip_code RETURN VARCHAR2
IS
BEGIN
     RETURN DEFAULT_ZIP_CODE;
END;and
SELECT my_const.get_default_zip_code from dual;I don't want to create functions to referrence the default varaibles. Does anyone have any clues?
thanks
Edited by: user4184769 on Jul 19, 2010 8:36 AM

riedelme wrote:
thanks for the info. Your scope explanation makes sense even though it is not intuitive to me. I think the usage of package variables should be supported by SQL (they're just values to be copied) Maybe look at it from another language's perspective. You want to use a global PL package variable in Java/C#/Delphi/VB/etc. How would you do it?
None of these languages can crack open the data segment of a PL code unit, inspect the variables in it, and extract a value from it. Instead, it needs to be done as follows:
Using sqlplus as the client illustrates how all these languages will need to do it:
SQL> var value varchar2(20);
SQL> begin
2>     :value := SomePackage.someVar;
3> end;
4> /So why should SQL behave differently? It is not the same as the PL language. It is not a subset of the PL language. Yeah, PL/SQL blurs the line between these 2 languages making it very simple for us to mix their source code. But PL/SQL is SQL integrated with PL - not PL integrated with SQL. PL has tight hooks into SQL, creating cursors for you, defining bind variables, binding variables and doing the whole Oracle Call Interface bit for you.
But SQL has no need for PL code, just as it has no need for Java code, or Delphi code or VB code. Yes, it is possible for it to call Java stored procs. As it is possible for it to call PL procs. But these are via the formal call interface of those languages - not via tight integration hooks that blur the languages and make SQL and Java, or SQL and PL, look like a single integrated source code unit.
Thus SQL has the pretty much the same constraints in calling the PL language as other languages do. What SQL can do is use the PL engine's call interface and tell it "+execute this function and return the result of the function+".

Using Global variable in Record Group

Hi,
I have a requirement where in I need to pull a column name from a table and then use that value in the select statement of a record group. I have tried using global variables but it is not working. Here is the record group I would like to use.
RG_DOMAIN is based on LOV_DOMAIN
SELECT :GLOBAL.DOMAIN_COLUMN_NAME, DESCRIPTION FROM
DM_T_DOMAIN_VALUES
WHERE DOMAIN_NAME := BLOCK.ATTRIBUTE;
In the Key-Listval I have a select statement in which does this :
SELECT DOMAIN_COLUMN
INTO :GLOBAL.DOMAIN_COLUMN_NAME
FROM DM_T_DOMAIN_RULES WHERE DOMAIN_NAME = :BLOCK.ATTRIBUTE;
SHOW_LOV('LOV_DOMAIN');
The problem is I am not getting the value I am just getting the Domain_column name. For example for Domain_name 'CALC_TYP' the Domain_column is COLUMN_10 and I just see COLUMN_10 my LOV when I want to see the value of COLUMN_10 from the DM_T_DOMAIN_VALUES table.
I tried using Name_in and Copy but not working. Can anyone suggest a solution?
Thanks

Francois ,
I tried this but I am getting error saying record group does not exist. Can you tell me what should I go in Populate_group... and show_lov..maybe I am doing something wrong?
Declare
LC$Req Varchar2(512) ;
Begin
LC$Req := 'SELECT ' || :GLOBAL.DOMAIN_COLUMN_NAME || ' FROM ....' ;
Create_Group_From_Query( rg_group, LC$Req ) ;
Populate_group(RG_DOMAIN); ?? --- is this correct?
Show_Lov(LOV_DOMAIN) ; -- and is this correct?
End;

Global Variable in Storage Package.

Hi,
I have one storage package with global variable.
if others procedures (in package) change this variable, in other sessions, it will not have the init value.
I need reset this global variable.
please help.
thanks.

Hello
Variables in packages are only visible to the session they are used in i.e. each session that uses the package gets it's own "copy" of the package and it's variables. If you want to share data between sessions you could look at global application contexts :
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10759/statements_5002.htm#sthref4478

PI Global Variables

I have been looking for ways to support global variables (across maps, not within a single map) and cannot find anything.
My scenario is a synchronous RFC out of R3, through PI, and out to a vendor's product lookup service...all synchronous. The issue is that I need to log values from the RFC request as well as values from the vendor response.
I can get the process working with a sync/async bridge in a BPM (the async part being to write out vendor response to the log file). What I need is some way to store RFC request values and map them into my log file too.
Unless there is some Global variable method that spans across an entire process, I figure I need to do something special in the BPM. Can I achieve this by creating a split/copy of my request message, sending one out to the vendor and holding the other in a BPM wait of some sort. Then when the response comes back, split/copy it also and let one copy respond to SAP and the other merge up with the waiting request? Or something like this?
Thanks for any suggestions.
Keith

Hi Keith,
I think you can achieve your requirement using a combination of Lookup & BPM (Sync Async bridge) techniques. May be you can try the following;
Integration process design:
START
^^
ReceiveStep(Open SyncAsyncBridge)
^^
Transformation (MultiMapping with lookup)
^^
SendStep(Send RFC Resp &Close SyncAsyncBridge)
^^
SendStep(Send Log message)
^^
STOP
Details:
Step1: Use Receive step to receive the sync RFC message and ope n S/A bridge.
Step2: In Mapping (Transformation step) use Mapping lookups (RFC/DB/SOAP) to get the Vendor response and in same mapping generate both the Log message and RFC response as output messages (Multi-Mapping)
Step3:Send RFC Response message and close S/A bridge
Step4:Send Log message
Hope this helps.
Regards,
Ananth

Using a global variable within a function

Hi all,
I'm trying to learn how to use global variables, but can't quite get it right:
Im trying to use two buttons, named UpButton and DownButton to control one global variable, p1
A text field, named "Value" displays p1.
Here's my code:
p1 = 0;
ButtonClick("UpButton", p1, 100,"Value");
ButtonClick("DownButton", p1,(-100),"Value");
function ButtonClick(ButtonName,Var,Increment,TextToChange){
                    sym.$(ButtonName).click(function(){
                    Var = Var + Increment;
                    sym.$(TextToChange).html(Var);
However, it seems to be treating p1 as two different variables.
Here's a link to the page to show you what I mean, apologies but this link wont work in google chrome because I'm using dropbox as a server temporarily
In other browsers you may need to click "Show all content" or similar to any security warnings...
https://dl.dropboxusercontent.com/u/83693404/ButtonTest/buttons.html
Here are the project files:
https://app.box.com/s/0shocivto8fl295h62uq
Any help greatly appreciated, sorry if this is a stupid question,
Katherine

Hi Katherine,
However, it seems to be treating p1 as two different variables.
Indeed, your code created two different variables in two different scopes (I guess it as to do with JavaScript closures, but do not ask me more, I am still a bit foggy about that idiosyncrasy ).
In JavaScript, a primitive parameter – this is the case here with p1, a Number value –, is passed by value. In other words, a copy of the value is made. Your code handles two copies of the value stored in p1.
This contrasts with an object parameter, which is passed by reference (address in memory), without copy. Your code would work if Numbers were passed by reference : the two Var (p1) would then point to the same address.
The intent behind your trial is a global variable.
1) Let us be as simple as possible :
Stage : document.compositionReady event handler
p1 = 0;
buttonClick = function( Increment)
p1 += Increment;
sym.$( "Value").html( p1);
Stage : DownButton.click event handler
buttonClick(-100);
Stage : UpButton.click event handler
buttonClick(100);
Without being preceded by the var keyword the variables are global.
So the Number variable p1 can be accessed inside function buttonClick.
And the Function variable buttonClick as well, is accessible inside click event handlers, everything (function definition +function calls) being inside the same symbol (Stage).
2) Now, suppose this is no longer the case : you want to access a variable from another symbol.
We create a new GraySquare symbol, instantiated both in the DownButton symbol (instance name DownSquare) and in the UpButton symbol (instance name DownSquare).
Stage : document.compositionReady event handler
p1 = 0;
sym.buttonClick = function( Increment)
p1 += Increment;
sym.$( "Value").html( p1);
The sym. prefix is now necessary to make the variable (here a Function, but you would proceed exactly the same with a String, Number or Boolean) accessible in other symbols.
DownButton symbol : DownSquare.click event handler
sym.getComposition().getStage().buttonClick( -100);
UpButton symbol : UpSquare.click event handler
sym.getComposition().getStage().buttonClick( 100);
From these other symbols, the sym.getComposition().getStage(). prefix is necessary to acces to our global variable (function).
The two examples are downloadable here : https://app.box.com/s/6vkyiqk7i8zwlw0j1wk1
Gil

Timeline. How does (or does not) update global variables?

Hello All,
I am having problems to understand how a timeline updates values. In my case the timeline is supposed to change an index within a second always by incrementing it by one or decrementing by one. Basically I am trying to create a mosaic of images that when I press left key all the columns move to left and when I press right key all the columns move to right.
To do this I have a deltaX constant that defines the translation.
Then I have a global tracker initialized to 0 and then udated +1 if move to right, -1 if move to left.
The Timeline is:
public var tracker: Number = 0;
var thumbnails: ImageView[] = bind for (column in [0..appModel.CATALOG_COLUMNS + 1]) {
                for (row in [1..appModel.CATALOG_ROWS]) {
                    def imageView: ImageView = ImageView {
                                image: bind catalogData.dataAt(row, column)
                                x: bind (column - 1)*catalogData.maxThumbnailWidth + column*xSpacing
                                y: bind ySpacing + (row - 1) * (catalogData.maxThumbnailHeight + ySpacing)
                                translateX: bind tracker*deltaX
                                transforms: bind [
                                    Rotate {
                                        angle: bind direction * rotation
                                        pivotX: bind imageView.x + imageView.boundsInLocal.width / 2
                                        pivotY: bind imageView.y + imageView.boundsInLocal.height / 2
    override public function create(): Node {
        return Group {
                    content: bind thumbnails
public function rotateAndTranslateToRight(): Void {
        direction = 1;
        translateAndRotateTimeline.stop();
        translateAndRotateTimeline.play();
    public function rotateAndTranslateToLeft(): Void {
        direction = -1;
        translateAndRotateTimeline.stop();
        translateAndRotateTimeline.play();
    var translateAndRotateTimeline = Timeline {
        def initialValueTracker = tracker;
                keyFrames: [
                    KeyFrame {
                        time: 0s
                        values: [
                             rotation => 0,
                             tracker => initialValueTracker
                    KeyFrame {
                        time: 1s
                        values: [
                            rotation => 360 tween Interpolator.LINEAR,
                            tracker => initialValueTracker + direction tween Interpolator.LINEAR
            }The problem is that if I first move to right the Timeline works correctly and tracker goes from 0 to 1 in one second, therefore I see a translation to right of tracker*deltaX pixels. So far so good.
Then if I move to left, I am expecting the Timeline to change tracker from 1 to 0 in one second, but really it is changing tracker from 0 to -1... which of course messes up my translation to left.
I thought Timeline updates global variables (define outside the Timeline in the context of the class the Timeline is defined) during the transition, but apparently from my observation it doesn't.
Or maybe I am not defining correctly the Timeline itself and/or the tracker variables?
Thanks.
Edited by: sacchett88 on Jun 4, 2010 1:03 PM

Thanks for the reply... but it didn't help me that much in finding the workaround. I wrote a simpler example to prove the point that can be easily copied and pasted and run. The example draw a circle and for every right key it should move the circle to right of a deltaX number of pixel. If left key is pressed then the circle should move to left of a deltaX number of pixels. The code is:
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.shape.Circle;
import javafx.scene.paint.Color;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.KeyCode;
import javafx.animation.Timeline;
import javafx.animation.KeyFrame;
import javafx.animation.Interpolator;
var deltaX: Number = 70;
var direction: Number = 1;
var tracker: Number = 0;
var circle: Circle;
var translate = Timeline {
    def initialValueTracker = tracker;
            keyFrames: [
                KeyFrame {
                    time: 0s
                    values: [
                        tracker => initialValueTracker
                KeyFrame {
                    time: 1s
                    values: [
                        tracker => initialValueTracker + direction tween Interpolator.LINEAR
Stage {
    title: "Application title"
    scene: Scene {
        width: 900
        height:500
        content: [
            circle = Circle {
                centerX: 100,
                centerY: 100,
                translateX: bind tracker*deltaX
                radius: 40
                fill: Color.BLACK
                onKeyPressed: function (e: KeyEvent): Void {
                    if (e.code == KeyCode.VK_RIGHT) {
                        direction = 1;
                        translate.stop();
                        translate.play();
                    } else if (e.code == KeyCode.VK_LEFT) {
                        direction = -1;
                        translate.stop();
                        translate.play();
circle.requestFocus();I understand how KeyFrame works. However the final value I'd like to be the initial value for next key press. I also tried to assign explicitely the final value to the tracker variable at the end of the timeline, but next time timeline still picks up the initial value 0 of tracker.
Thanks.

Functional global variable

I would like to ask to the experts a question about functional global variables.
In the labview basics 2 course was said that a functional global variable is not reentrant.
My purpose is to implement a code in such a way.2 main vi's. The first vi deals with some hardware that writes data in an output file with 1 Hz rate (more or less 1Hz, I cannot decide it).
The second vi deals with a different hardware (thermocouples). This works at a different rate (I cannot match exactly the different rates). I would like to write the data from the second hardware in the same output file of the first vi.
I am thinking to use a functional global variable to pass the information from the second vi to the first vi. In this way I am using the data from the thermocouples at a rate given by the first vi. But at the same time in the global variable the data are written at a rate given by the second vi.
My question is: what exactly happens if the subvi (functional global variable) is called exactly at the same time? As you can understand it's not really important if I read the temperature with an error of 1 second, but I would not like the execution would stop or something like that.
A functional global variable is a subVI that is not reentrant. This means that when
the subVI is called from multiple locations, the same copy of the subVI is used.
Therefore, only one call to the subVI can occur at a time.functional global variable is a subVI that is not reentrant. This means that whenthe subVI is called from multiple locations, the same copy of the subVI is used.Therefore, only one call to the subVI can occur at a time.

A couple of quick comments to add to this thread.
FG's can be involved in Race Conditions if two callers attempt to direct set the same value. An Action Engine (well what do you expect?) can be coded to help with those situations.
Example:
In arecent app I needed to set the heaters to "0" if an over-pressure condition was detected. The Heater set points where driven by a PID. The safety conditions where controlled by a process monitoring the input values.
So how do I keep the PID from setting the heater when the rig is not safe?
A Safety AE !
Actions used by the pressure monitoring set the Safety AE in an "go-safe" state where setting the heaters results in a null op.
This particular pattern (two writters) screams for an AE to coordinate the vaious actions. Do this same thing with queues could get tricky.
So for the Q in this thread we have a pattern of "two source of info, one sink for each" that screams for a queue.
BTW:
The AE Nugget linked above addresses what happens when two callers attempt to call the same non-re-entrant sub-VI.
Have fun,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Formula node with global variable

Hi,
I am tring to use formula node with global variables as an input and output,
but this is where I see the SW hangs forever.
By the way I am a novice to the labview.
Can some give me hint why this is happening?
Thank you in advance,
Do
Solved!
Go to Solution.
Attachments:
formula_node_wGlobalInputOutput.JPG ‏281 KB

Well, the first case of the two loops has a direct LabVIEW translation like this:
However, just because that's the direct translation doesn't mean that's what you should be doing. In the formula node it seems as if you were copying elements from one array to another. Element-wise operation on arrays via loops can be quite inefficient in LabVIEW. Often one can operate in place with arrays, and an operation that would require two loops in a language like C would actually require no loops in LabVIEW. In fact, with the above example, even if you were to use loops, arrays can auto-index for-loops so you don't even need to wire the constants to the N terminals to tell the loop(s) how many times to run.
Can you describe what you're trying to accomplish? There's likely to be a more natural way to do it in LabVIEW that would require no loops. Have you gone through the tutorials? You can also look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.

Static used on global variable declaration

I have inherited a CVI project that contains a single .C file and a couple of .UIR files with their associated .H files.
Many of the global variables have STATIC in their declaration - I believe this is due to the fact the original developer originally had them inside various functions and at some point changed strategy to make them global, leaving the STATIC keyword in place when copy/pasting.
As I understand it the ONLY implication of STATIC on a global variable would be to keep its visibility only to the .C file in which it is declared. In this instance that is moot since there is only one .C file in the project.
Is there anything about LabWindows/CVI which I might not be aware of that makes this use of STATIC cause something different than if STATIC were not used?
Thanks for any input you might have since I'm new to CVI

Roberto and menchar said it well:
"static variables are declared at compile time and survive when their block of code terminates. If declared at function level, their value survives from one call of the function to another, so that they can be used over time to store permanent values locale to the function. If declared at module level, they are common to all functions in the module and are allocated outside the stack so that their values are not lost during program life. In every case they can be accessed and modified in values by functions in the program. If arrays, they cannot be dinamically changed in size."
"The static keyword can be used with a function name also, meaning the function name isn't exported to the linker, and the function is in scope only to code within the module."

PtbyPt editing with global variable?

Hey guys,
I'm wanting to setup a counter to count a crossing of a sinewave. The thing is, the sinewave is not zeroed. It's a sinewave of a cyclic load cell that I'm testing a material with. With this test, I will put load on the load cell, then cycle from that position, which is my realitive zero.
So, say I put 0.043 volts on the load cell. I would then cycle the material at a certain strain both ways horizontally, and this "0.043" would be my zero for the crossing. I've included my Vi so you can see what's happening in the "strain" and "stress" state. These states are independant from eachother and don't work together in anyway. They're just recording data on different channels
Is there a way I can edit the Pt2Pt vi to look at this "0.043" value (which is an analog channel)? I was thinking global variable...or...something simpler I could put in my code. I'm still a novice in all this and I would greatly appreciate some advice.
Kindly
Gary S.
Attachments:
New CSS state44.vi ‏405 KB

glskinner wrote:
The signal is crossing at the offset, but my "cycle count" is crossing at zero since I'm using Pt2Pt. How to I get my cycle count to cross at the offset? Is there a way I can edit the Pt2Pt to look at my beginning load cell reading zero/offset (I have it a TTL that starts the data aquisition) and then increment everytime is reaches the offset?
As for the why I need to worry about where the cycle count crosses: I am recording the cycle count as a scalar numeric value in my data file, along side my load cell. I need this cycle count to match with the crossing of the load cell for data reduction purposes. So if the load cell crosses at -0.043, I need the cycle count to change when the load cell crosses that value. I understand the Pt2Pt crosses at zero, but the stipulation for the crossing of this vi, "0", is what I want to change. I want it to cross at my offset (-.043, or whatever the case may be), since that is my true "zero" in relation to the behavior of my load cell voltage.
I think you're not following my train of thought. What you want to do is make a copy of the data (i.e, create a wire branch). On one branch, you will do the crossing calcs. On the other branch, you retain the actual data. On the crossing calcs branch, you will subtract out the offset so you can use the Pt2Pt without modifications. On the other branch you have your original data. There should be a direct correlation between the two. You should now have a record of both how many times it crosses and where it crossed.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

To use PARAMETERS or GLOBAL Variables

I want to share data values amongst Forms (I am using Forms 9i), which is a better trade-off using GLOBAL variables or PARAMETERS.
Which option is a better one ?
Please Suggest...
Regards,
Gaurav Srivastava

Also if your application uses go_form and allows the user to have two copies of the same form running at once, if you decide to use globals, make sure the form receiving the global erases it immediately on startup. Otherwise the user might go-form to the other copy of the form, which then be seeing the globals.

Global Variables passing from standard form for use on custom form

Hi,
I'm trying to grab a value from a standard form, and pass it to a new custom form, which I am opening automatically from the standard form via personalizations. Is anyone aware of a way to send a value from one form to another? I was going to try using a global variable, which it looks like you can set through personalization. I tried doing it by passing the value as a form parameter, which works if I hard code a value, but it doesn't work if I refer to a value from the standard form.

in your E-Business-environment may exist some special codings, which you have to think of, when passing parameters through the application.
Copy the question to your EBS-Forum. They know ways using personalization and passing parameters

Copying Global variables

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