Subroutine pass by value and result

I actually wanted to know if the copying the value back to variable(inpu2) it works.but when i use stop staement to exit the subroutine the value is still copied back to the actual parameter input 2.
plz guide me.
REPORT zsub_routines_pgm.
DATA : input1 TYPE i VALUE 1,
       input2 TYPE i VALUE 2.
*PERFORM add USING input1 input2.
*INCLUDE zsub_routines_pgm_addf01.
WRITE : / 'before call', input2.
PERFORM add CHANGING input1 input2.
WRITE : / 'after call' , input2.
INCLUDE zsub_routines_pgm_addf01.
include pgm:
*&      Form add
      text
     -->P_INPUT1 text
     -->P_INPUT2 text
FORM add CHANGING value(p_input1)
                    value(p_input2).
p_input2 = p_input1 + p_input2.
stop.
ENDFORM.                    "

Hello,
as described in the online help, call-by-value parameters are not changed in the calling program when the procedure ends with an error. In your case, the subroutine does not end with an error (the STOP statement is considererd a "normal" way of leaving a procedure).
Check this code:
REPORT z_tmp.
DATA : input1 TYPE i VALUE 1,
       input2 TYPE i VALUE 2.
START-OF-SELECTION.
WRITE : / 'before call', input2.
TRY.
      PERFORM add CHANGING input1 input2.
    CATCH cx_sy_zerodivide.
ENDTRY.
WRITE : / 'after call' , input2.
FORM add CHANGING value(p_input1)
                  value(p_input2)
         RAISING cx_sy_zerodivide.
p_input2 = p_input1 + p_input2.
* Force an error:
p_input2 = p_input2 / 0.
ENDFORM.
In this program, the changed value within the subroutine is not passed back to the caller, as the routine ends with an error. Thus, input2 is 2 before and after the call.
Hope this helps,
David

Similar Messages

Subroutine Pass by Value, Pass by Reference using xstring

Hi,
I am trying to check the difference between pass by value, pass by reference, pass by return value to a subroutine. When I tried integers as parameters the following functionality worked. When I am using xstring as parameters I am not getting desired results.
Some one please explain me how the xstring's are passed to a subroutine.
Here I am giving the code and output of the code.
data : s_passbyref    type xstring,
       s_passbyval    type xstring,
       s_passbyretval type xstring.
* Pass by Value, Pass by Reference, Pass by return value - STRINGS
s_passbyref     = 'ABCD'.
s_passbyval     = 'ABCD'.
s_passbyretval = 'ABCD'.
write : / 'ByRef :', s_passbyref, 20 'By Val :', s_passbyval, 40 'By Return Value : ', s_passbyretval.
perform call_str_sub using s_passbyref s_passbyval changing s_passbyretval.
write : / 'ByRef :', s_passbyref, 20 'By Val :', s_passbyval, 40 'By Return Value : ', s_passbyretval.
form call_str_sub using ps_passbyref value(ps_passbyval) changing value(ps_passbyretval).
ps_passbyretval = 'XYZ'.
ps_passbyref    = 'XYZ'.
ps_passbyval    = 'XYZ'.
endform.
OUTPUT
ByRef : ABCD    By Val : ABCD    By Return Value : ABCD
ByRef :               By Val : ABCD    By Return Value :
Thanks in advance
Naveen

try this
write : / 'ByRef :', s_passbyref, 20 'By Val :', s_passbyval, 40 'By Return Value : ', ps_passbyretval.

Reports - Passing checkbox values and conditional column visibility

Although I've been using Oracle databases for many years, I've to admit I'm rather new to APEX. I'm building a first prototype project to convince our project leaders and managers of the usefulness of the product for future projects (as for visual Database interfaces where the accent is on forms and reporting, it will often be faster and less expensive to build an APEX application instead of a full blown Java or C# webapp).
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Let me start with a quick description. I've the following parent/child structures:
Provinces > Cities > Intersections > Loops > Loop Detections.
I basically want to make a report on the loop detections. Now, considering we'll have many thousands of detections a day, I made kind of a drilldown structure. You first choose your province, then the city, then the intersection and finally the loop. I didn't use lists to make the selection. Instead I made a (classic) report for each part as this allows me to give detailed information for each part. In each report, I made a link on the identifier. For example, when I select a province (by clicking on the link), I pass the province identifier to the cities report and use it in the query to limit my report to those cities for the given province. I repeat these step for the different parts, which in the end, gives me the loop detections for the selected loop. The good news is all this works fine. The person who'll be using this application however made a suggestion and asked if it would not be possible to select different loops and as such get the detections for several loops (the rest of the application stays the same). This however means I cannot use the column link anymore. Now, I was thinking in the direction of a checkbox. The column link is still there, but the user would also have the possibility to select several items in the report. I managad to add a checkbox to the report, linked to the loop identifier column. That's not exactly difficult. I cannot figure out however, how I can pass the selected identifiers to the next report (detections for the selected loops) and use it in the underlaying query of this report. The problem is, I don't know how to pass the checked values to the next page and how to use these values in the report query of that page. I suppose this must be possible, but I couldn't figure out how. I tried playing around with APEX_APPLICATION.G_Fxx and such. Remember I'm a newbie and this seems to fall under more advanced features.
I've uploaded images of the 2 concerning report pages for illustration:
http://img96.imageshack.us/img96/1497/apex01.jpg
http://img140.imageshack.us/img140/9868/apex02.jpg
A second point that's bothering me is the following. In the loop detection report I show a colum link (I picked an icon instead of the column value) for each row. I also have a column that shows the number of detections for the given loop (and day). Now, for some loops, there are no detections for that given day. As such, there's no point in selecting this loop, as the result will be an empty report. However, I still want to show the loop in the loop selection report, as it's still present (it's not as if it suddenly disappeared). Sure, no big problem and most users probably have sufficient intelligence to figure this out. However, it would be nice if I could make the icon (colum link) visible only for those loops that have detections, or in other words, for those records where number_of_detections (underlaying column COUNT) is greater than 0. I couldn't figure out a way to do this either. The Conditional Display option for a column didn't really offer me a solution here.
Before I forget, I'm using APEX 4.0.1 on an Oracle XE database.
Any tips or suggestions would be welcome! :)
Thanks.
Erwin

Hi,
You mean something like in this sample
https://apex.oracle.com/pls/otn/f?p=40323:55
You can store checked values to collection and use it then in another report where clause
See e.g. this post for how you can store checked rows to collection
Re: Need help with APEX_Collection
In sample DEPT report query is
SELECT
CASE WHEN EXISTS(SELECT 1 FROM emp e WHERE e.deptno = d.deptno) THEN
APEX_ITEM.CHECKBOX(1,c.c002,'onclick="saveDeptChk(this,'||c.seq_id||')"','true')
END AS row_selector,
c.c002 AS checked,
d.DEPTNO,
d.DNAME,
d.LOC
FROM dept d,
apex_collections c
WHERE c.collection_name = 'DEPT_CHK_COLLECTION'
AND d.deptno = c.c001And EMP report
SELECT e.EMPNO,
e.ENAME,
e.JOB,
e.MGR,
e.HIREDATE,
e.SAL,
e.COMM,
e.DEPTNO
FROM emp e,
apex_collections c
WHERE c.collection_name = 'DEPT_CHK_COLLECTION'
AND c.c002 = 'true'
AND e.deptno = c.c001Regards,
Jari

How to pass a value and call SE38 program using SUBMIT statement

Hello Friends
I am trying to write a batch program in SE38, that calls other SE38 Programs.
I don't want to use Parameter command to see the value on screen.
All I want is to send a range of date (ToDate & FromDate) and generate different reports satisfying this date range condition.
Can some one please help me with this. I would really appreciate it.
I have tried the command SUBMIT with options of filling the input fields of the subsequent programs but I don't want to do this.
I want all the sub programs to be called one after another and the reports generated using the date varialbles I send from the main program.
I don't want to use se37 functions because of the client's request.
Any help will be highly appreciated.
Tks
Ram

Yes I am using SUBMIT command but I was not using the right options with the SUBMIT command and once I used the right options, it worked.
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Ram

In FM tables And Changing r bu default Pass by value or ref

hi friends ,
In Function Module Tables And Changing are by default Pass by value or reference.
with regards.

hi all,
i got the answer from abap in 21 days (page No 591),
changing parameters are passed by value and result.
internal tables are pass by reference.

Please go through the code, is it pass by value?

Can any one explain me the diff between call by value and call by reference in Subroutines.
ex :
PERFORM ADD_Z1CLASS1 USING LW_MARA-MATNR
                         CHANGING IDOC_DATA[].
FORM ADD_Z1CLASS1 USING    PV_MATNR TYPE MATNR
                 CHANGING PT_EDIDD TYPE EDIDD_TT.
Please let me know, if the above code is call by value or call by reference...?
Any suggestions will be appreciated!
Regards,
Kittu

hi,
using             -- Pass by reference
changing        -- Pass by reference
using value()   -- Pass by value
changing value( )-- Pass by value and result
The main difference between the pass by value and pass by reference is that " In pass by value the actual parameters are not changed while in pass by reference those are changed".
By reference Passes a pointer to the original memory location. Very efficient
By value Allocates a new memory location for use within the subroutine. The memory is freed when the subroutine ends. Prevents changes to passed variable
By value and result Similar to pass by value, but the contents of the new memory is copied back into the original memory before returning. Allows changes and allows a rollback .
Go through the following eg:
pass by ref:
data f1 value 'A'.
perform s1 using f1.
write / f1.
form s1 using p1.
     p1 = 'X'.
     endform.
o/p is X
using and changing Are Identical in Function
report ztx1805.
data: f1 value 'A',
        f2 value 'B'.
write: / f1, f2.
perform s1 using f1
             changing f2.
write: / f1, f2.
form s1 using p1
         changing p2.
     p1 = p2 = 'X'.
     endform.
o/p : A B
       X X
Pass by value:
data: f1 value 'A'.
perform s1 using f1.
write / f1.
form s1 using value(p1).
      p1 = 'X'.
      write / p1.
     endform.
o/p is X
        A
Hope this is clear.
so the code which you have pasted comes under pass by reference.
Reward points if helpful.
Thanks and regards.

How to pass a value to a BC4J method from JSP/ADF and get a return value.

How i can access and application module method from my jsp using JSTL passing a value and hope a return value from BC4J method already exposed using interfase and droped from data control to my jsp page
Any suggestions ?
Mensaje editado por:
mr2k

Hi,
Check the size of that Window in which you are displaying this Text of 130 characters.
May be it is less
in that case split that string into 2 strings and pass the two strings from ITCSY structure to script and use.
reward if useful
regards,
ANJI

Parameter passing by value or by reference in function module

hi everybody:
Im a beginner for abap.
Below description is described in online help.
In function module, the CALL FUNCTION statement can pass import, export, and changing parameters either by value or by reference. Table parameters are always transferred by reference.
I understand parameters passing by value means values carried by parameters are transferred, but I do not understand what is "by reference".
Please kindly give me a explanation.
Regards.
Andy

hi,
Function modules are modular units with interfaces. The interface can contain the following elements:
Import parameters are parameters passed to the function module. In general, these are assigned
standard ABAP Dictionary types. Import parameters can also be characterized as optional.
Export parameters are passed from the function module to the calling program. Export parameters
are always optional and for that reason do not need to be accepted by the calling program.
Changing parameters are passed to the function module and can be changed by it. The result is
returned to the calling program after the function module has executed.
Exceptions are used to intercept errors. If an error triggers an exception in a function module, the
function module stops. You can assign exceptions to numbers in the calling program, which sets the
system field SY-SUBRC to that value. This return code can then be handled by the program.
By reference Passes a pointer to the original memory location. Very efficient
By value Allocates a new memory location for use within the subroutine. The memory is freed when the subroutine ends. Prevents changes to passed variable
By value and result Similar to pass by value, but the contents of the new memory is copied back into the original memory before returning. Allows changes and allows a rollback
When you pass a parameter by reference, new memory is not allocated for the value. Instead, a pointer to the original memory location is passed. All references to the parameter are references to the original memory location. Changes to the variable within the subroutine update the original memory location immediately.
1 report ztx1804.
2 data f1 value 'A'.
3
4 perform s1 using f1.
5 write / f1.
6
7 form s1 using p1.
8 p1 = 'X'.
9 endform.
The code in Listing produces the following output:
X
Hope this helps, Do reward.

Presentation Variable name being passed as value

I have a requirement where value needs to be checked against two separate fields for filtering (as OR statement). But there should be ability to filter on these fields separately as well.
Dashboard prompt:
Province [Multi search]
State [Multi search]
Combined search (Province OR State Fields) [Edit Box] --- used to pass presentation variable
Report filter:
Province is prompted
AND State is prompted
AND Province is @{presentation_variable} (no default)
OR State is @{presentation_variable} (no default)
But if the text field with presentation variable in not used to filter, then the report shows no result because the presentation variable name itself is taken as a value. Any solution how this can be done making sure that if province only is searched for then the presentation variable is not passed as value and the query returns no results?
Thanks everyone.

Thanks Rachit, that helps. For the scenario mentioned initially, even this works:
Province is @{presentation_variable} (no default)
OR State is @{presentation_variable} (no default)
But the challenge is if I want to add another filter (like country) also as a filter. When users filter only on country, then the report shows no results because no value has been passed to the presentation variable and the query generated uses presentation variable name as the value!

Passing multiple values to a parmeters in Discoverer 4i

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I have a requirement of passing multiple values (Operating Unit Names) to the parameter(P_Opr_Unit) in Discoverer.
I am using PL/SQL function to get the data in Discoverer.Function is working fine for multiple values from Database(SQL Developer).
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Hi,
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Hi,
I want to pass a field value from the popup window to oninput processing of main page ( from where popup window is triggered). and need to close the popup window. How to do it ?
In the popup window's oninputprocessing, im doing some validation checks. If it passes all the validations, then only the control shd come to main page ..else it should stay in popup window only .
Regards,
Jothi.

Hi Jothi,
you can use java script to pass the value and close your popup window. use the following code.
in your popup window:
function passData(h1)
         window.opener.document.getElementById('var1').value = h1 ;
         window.close();
then call this function when you finish your validations.
in your main page layout create an input field with id as passed in the function above "var1".
In the value attribute give it your variable as follow:
<htmlb:inputField id      = "var1"
                          value   = "<%= var2 %>"
                          visible = "false" />
"var2" will be assigned the value from your popup window.
I hope this will help you..
Regards,
Husain

No Pass-by-Value or Copy Constructors

After having used AS3 for some months now, I've realized that
there is no pass-by-value option when passing variables into
functions. The only option is pass-by-reference. Similarly, there
are no default copy constructors. So, if I want to create a copy of
an object, I have to write code to create a new instance of the
object and manually copy all of the source variable's properties to
the new target object.
This lack of a pass-by-value mechanism and copy constructors
leads to some confusing behavior and necessitates writing quite a
bit of extra code. A common case involving confusion is when a
function call changes a property of a passed-in object. The caller
might assume that the object will not be modified and then be
surprised when it is. This is especially likely to happen when
different people are working on the caller and the callee. It
shouldn't be necessary for the caller to be concerned about the
internal workings of an object being used but, because there is no
pass-by-value mechanism, the caller often must take this into
account.
Because of the lack of a pass-by-value mechanism the onus is
on the person writing a function to always make a copy of passed-in
objects if they are going to be modified. Unfortunately, the lack
of default copy constructors makes this an onerous task. The only
way to copy an object is to write code to create a new object and
then copy each property of the object. Where the properties are
objects themselves a deep copy is needed and the amount of code can
become large and the task tedious. To do this amounts to writing a
set of copy constructors for each object and sub-object - each time
a variable is accessed for modify.
To make matters worse, it's not even possible to write a copy
constructor for user-created classes. Consider the following
attempt at writing a copy constructor to copy two instance
variables for a custom Form class:
public function Form(f:Form) {
this._textHeight = f._textHeight;
this._actionURL = f._actionURL;
This causes a "Duplicate function definition" compile error
because a default constructor already exists.
Pass-by-value and built-in copy constructors are standard
features in most OOP languages and their lack in AS3 is a glaring
omission. I hope Adobe will seriously consider adding them to the
next version of ActionScript.

Nitin_Mathur wrote:
at one time i had doubted my own conceptsNote that the type of a parameter may be different from the type of the object you created. However, it is still the same value that is passed, as pointed out by this example:
public class Test {
    public Test() {
        //an object of type "MyClass" is created on the heap with the "new" operator:
        MyClass myClass = new MyClass();
        doSomething(myClass);//the reference to the object is passed by value
    private void doSomething(MyInterface myInterface) {
        //the passed value is a reference to a "MyClass" object,
        //but here it is considered to be a "MyInterface" object
        //and we don't have access to the "MyClass"-method "testClass()"
        myInterface.testInterface();
    public static void main(String[] args) {
        new Test();
interface MyInterface {
    public void testInterface();
class MyClass implements MyInterface {
    public void testInterface() {
        System.out.println("testInterface");
    public void testClass(){
        System.out.println("testClass");
}

Pass by reference and String

public class Test {
    static void method(String str) {
        str = "String Changed";
    public static void main(String[] args) {
        String str = new String("My String");
        System.out.println(str);
        method(str);
        System.out.println(str);
}The output is
My String
My String
How this is possible when objects are passed by reference ?

> How this is possible when objects are passed by reference ?
All parameters to methods are passed "by value." In other words, values of parameter variables in a method are copies of the values the invoker specified as arguments. If you pass a double to a method, its parameter is a copy of whatever value was being passed as an argument, and the method can change its parameter's value without affecting values in the code that invoked the method. For example:
class PassByValue {
    public static void main(String[] args) {
        double one = 1.0;
        System.out.println("before: one = " + one);
        halveIt(one);
        System.out.println("after: one = " + one);
    public static void halveIt(double arg) {
        arg /= 2.0;     // divide arg by two
        System.out.println("halved: arg = " + arg);
}The following output illustrates that the value of arg inside halveIt is divided by two without affecting the value of the variable one in main:before: one = 1.0
halved: arg = 0.5
after: one = 1.0You should note that when the parameter is an object reference, the object reference -- not the object itself -- is what is passed "by value." Thus, you can change which object a parameter refers to inside the method without affecting the reference that was passed. But if you change any fields of the object or invoke methods that change the object's state, the object is changed for every part of the program that holds a reference to it. Here is an example to show the distinction:
class PassRef {
    public static void main(String[] args) {
        Body sirius = new Body("Sirius", null);
        System.out.println("before: " + sirius);
        commonName(sirius);
        System.out.println("after: " + sirius);
    public static void commonName(Body bodyRef) {
        bodyRef.name = "Dog Star";
        bodyRef = null;
}This program produces the following output: before: 0 (Sirius)
after: 0 (Dog Star)Notice that the contents of the object have been modified with a name change, while the variable sirius still refers to the Body object even though the method commonName changed the value of its bodyRef parameter variable to null. This requires some explanation.
The following diagram shows the state of the variables just after main invokes commonName:
main()            |              |
    sirius------->| idNum: 0     |
                  | name --------+------>"Sirius"
commonName()----->| orbits: null |
    bodyRef       |______________|At this point, the two variables sirius (in main) and bodyRef (in commonName) both refer to the same underlying object. When commonName changes the field bodyRef.name, the name is changed in the underlying object that the two variables share. When commonName changes the value of bodyRef to null, only the value of the bodyRef variable is changed; the value of sirius remains unchanged because the parameter bodyRef is a pass-by-value copy of sirius. Inside the method commonName, all you are changing is the value in the parameter variable bodyRef, just as all you changed in halveIt was the value in the parameter variable arg. If changing bodyRef affected the value of sirius in main, the "after" line would say "null". However, the variable bodyRef in commonName and the variable sirius in main both refer to the same underlying object, so the change made inside commonName is visible through the reference sirius.
Some people will say incorrectly that objects are passed "by reference." In programming language design, the term pass by reference properly means that when an argument is passed to a function, the invoked function gets a reference to the original value, not a copy of its value. If the function modifies its parameter, the value in the calling code will be changed because the argument and parameter use the same slot in memory. If the Java programming language actually had pass-by-reference parameters, there would be a way to declare halveIt so that the preceding code would modify the value of one, or so that commonName could change the variable sirius to null. This is not possible. The Java programming language does not pass objects by reference; it passes object references by value. Because two copies of the same reference refer to the same actual object, changes made through one reference variable are visible through the other. There is exactly one parameter passing mode -- pass by value -- and that helps keep things simple.
-- Arnold, K., Gosling J., Holmes D. (2006). The Java� Programming Language Fourth Edition. Boston: Addison-Wesley.
~

Java is pass by value or pass by refrence

Can any one explain whetherjava is pass by value or pass by refrence.

Everything in Java is passed "by value". Everything.
Pass-by-value
- When an argument is passed to a function, the invoked function gets a copy of the original value.
- The local variable inside the method declaration is not connected to the caller's argument; any changes made to the values of the local variables inside the body of the method will have no effect on the values of the arguments in the method call.
- If the copied value in the local variable happens to be a reference (or "pointer") to an object, the variable can be used to modify the object to which the reference points.
Some people will say incorrectly that objects are passed "by reference." In programming language design, the term pass by reference properly means that when an argument is passed to a function, the invoked function gets a reference to the original value, not a copy of its value. If the function modifies its parameter, the value in the calling code will be changed because the argument and parameter use the same slot in memory.... The Java programming language does not pass objects by reference; it passes object references by value. Because two copies of the same reference refer to the same actual object, changes made through one reference variable are visible through the other. There is exactly one parameter passing mode -- pass by value -- and that helps keep things simple.
-- James Gosling, et al., The Java Programming Language, 4th Edition
[Pass-by-Value Please (Cup Size continued)|http://www.javaranch.com/campfire/StoryPassBy.jsp]

Do we have PB VALUE and PB REFERENCE in RFC'SN or BAPI'S

HI ABAPers,
greetings to all,
I HAVE A DOUBT REGARDING RFC'S concept.
Do we have PASS BY VALUE and PASS BY REFERENCE (OR) CALL BY VALUE and CALL BY REFERENCE in RFC'S or BAPI'S.
IF SO HOW DO THEY WORK.
please provide information about this PBR and PBV.

Hi
The OID´s do return values which is good.
But I´ve not been able to verify that this is inline with the acutal CPU load as shown via the GUI (Administration-Diagnostics-CPU utilisation)
Someone (thread in support community) pointed out that these values are number of packets sent to the CPU rather than the load of CPU?
CPU utilization for 5 seconds
.1.3.6.1.4.1.9.6.1.101.1.7.0
CPU utilization for 1 minutes
.1.3.6.1.4.1.9.6.1.101.1.8.0
CPU utilization for 5 minutes
.1.3.6.1.4.1.9.6.1.101.1.9.0
Can someone challenge that or verify the correctness of that statement?
Thank you for you input here.

Subroutine pass by value and result

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