Variabilizing variables

Hello - I think I need to find a way to dynamically generate names for hashtables and linked lists (and anything else, by the way) based on user inputed names.
I'm trying to write a financial program that allows a user to enter orders. The orders contain the following info - symbol (aka IBM), price, shares, buy or sell, and a reference number generated by me.
I want to store the order info in the following way:
create a hashtable for each symbol-side(buy/sell) generated. within the hash, i want the keys to be prices and the paired values to be lists of order reference numbers for orders that are inputed in that symbol at that price. i.e. suppose a customer enters the first order to buy shares in IBM. i want to then create a hashtable called buyIBM. if the order's price is $20, i want to put 20 in as the key and put the order's reference number into a newly named linked list called buyIBM20.
If another order then comes in to again buy ibm for $20, its reference number will be added to the buyIBM20 list.
If another order comes in to buy ibm for $21, i want to put 21 into the buyIBM hashtable as a new key and start a new list called buyIBM21 in as a value and put this order's reference number in as the first value in the buyIBM21 list.
If another order comes in to buy MSFT for $21, i want to start a new hashtable called buyMSFT....you get the point.
Then I also want to keep another hashtable of order reference numbers as keys with hashtable names as values, so that if i get user input to modify their order, i can easily find the hashtable where the order is.
My question with all of this is how do i use a variable to name a variable? In other words how do I name a hashtable based on a string or character input from a user? How do I get info from a hashtable when i need to indentify that hashtable with a string input from a user?
Does this make sense? Or am I just going about all of this completely wrong?
Thanks so much for your patience.

Solomon91607 wrote:
Thanks so much for these replies. I don't want to use a database because I think that that ultimately would be too slow. I wouldn't assume that. Production systems handling vast numbers of transactions use databases. The proper database on the proper hardware with the proper configuration and proper indices and queries can be very fast.
If you're always "looking up" things by the same fixed key--e.g. always by stock symbol or always by price, and you don't need to do things like filtering by criteria that are determined at runtime--then a map with a couple layers of map/list/set underneath it is probably sufficient. If those conditions don't hold, though, you're starting to veer into territory custom made for a database.
Let me give this a try - and please forgive me if I have more questions.Nothing to forgive. That's why this site is here. As long as you hold up your end of the bargain--ask clear questions, show evidence of putting forth some effort before asking, have a good attitude--it's all good.

Similar Messages

Lower case in variable substitution

Hi experts,
in my scenario I have a receiver CC that put an xml file in a target server.
The requirement is to dynamically determine target directory based on a field on mapping header.
I have used variabile substitution to retrieve the value of the field, and with %% i have put this value on field target directory.
The problem is: value from mapping is in capital letter, but the name of the target directory in which I have to put the file is in lower case letters, and target server is case sensitive.
Obviously I cannot change value in mapping, but I need to put variable in variable substituion in lower letters.
Is it possible?
Thanks
Fabio

Fabio Boni wrote:
Hi,
> I don't want to make changes on mapping, is not possible to put lower case in variable substituion?
> Thanks
> Fabio
no
also in case you want to put small case in variable substitution why cant you use dynamic configuration and set the values to lower case?

Casting primitive wrap type variable to primitive

We have this code:
float f = 22.2f;
System.out.println((int)f);
Which prints out "22".
Float f = 22.2f;
System.out.println((int)f);
When i changed the variabile type from float to Float, code throw up a compile a error, that Float type cannot be casted to int. Can somebody tell me what's going on? Isnt compiler supposed to do unboxing the variable to primitive float and then primitive float to be casted to an int?
System.out.println((int)f.floatValue());
Isnt that what the compiler is supposed to do? Code which works perfectly fine.
Thank for your help.

Hello vcraescu,
I think you are wondering why the compiler does not convert from Float to float (unboxing) and subsequently from float to short (your cast), so the bug report probably does not help you too much.
Casts come into play when the compiler can not assure that the statement is semantically correct. The bytecode would be the same with or without the cast (if the compiler would accept omitting casts).
Casting primitives:
int i = 0;
short s = (short)i;Purpose of the cast: The compiler has no idea whether the two higher bytes are relevant and you therefore need to specify that they are not.
Casting reference types:
With reference types there are two types of casts, the upcast and the downcast.
class Exampe {
     public static void example(Object... objects) {
          for (Object object : objects) {
               System.out.print(object);
               System.out.print(' ');
          System.out.println();
     public static void main(String[] args) {
          Object[] objects = { "String", 123, 1.23 };
          example(objects);
          example((Object) objects);
}The purpose of this (up)cast is that you want the object to be treated as beeing of a more general type.
org.w3c.dom.Node node;
switch(node.getNodeType()) {
     case org.w3c.dom.Node.ELEMENT_NODE:
          org.w3c.dom.Element element = (org.w3c.dom.Element) node;
     case org.w3c.dom.Node.TEXT_NODE:
          org.w3c.dom.Text element = (org.w3c.dom.Text) node;
     default:
}These casts tell the compiler that you are certain the object node is of a more specific type.
My point is that all these casts have a distinct purpose. Your cast on the other hand does not. Looking at your code I see a conversion from a wrapper to a primitive, not necessarily the loss of precision connected with it and that is what this cast should be about.
With kind regards
Ben Schulz

Problem with Threads and a static variable

I have a problem with the code below. I am yet to make sure that I understand the problem. Correct me if I am wrong please.
Code functionality:
A timer calls SetState every second. It sets the state and sets boolean variable "changed" to true. Then notifies a main process thread to check if the state changed to send a message.
The problem as far I understand is:
Assume the timer Thread calls SetState twice before the main process Thread runs. As a result, "changed" is set to true twice. However, since the main process is blocked twice during the two calls to SetState, when it runs it would have the two SetState timer threads blocked on its synchronized body. It will pass the first one, send the message and set "changed" to false since it was true. Now, it will pass the second thread, but here is the problem, "changed" is already set to false. As a result, it won't send the message even though it is supposed to.
Would you please let me know if my understanding is correct? If so, what would you propose to resolve the problem? Should I call wait some other or should I notify in a different way?
Thanks,
B.D.
Code:
private static volatile boolean bChanged = false;
private static Thread objMainProcess;
   protected static void Init(){
        objMainProcess = new Thread() {
            public void run() {
                while( objMainProcess == Thread.currentThread() ) {
                   GetState();
        objMainProcess.setDaemon( true );
        objMainProcess.start();
    public static void initStatusTimer(){
        if(objTimer == null)
             objTimer = new javax.swing.Timer( 1000, new java.awt.event.ActionListener(){
                public void actionPerformed( java.awt.event.ActionEvent evt){
                          SetState();
    private static void SetState(){
        if( objMainProcess == null ) return;
        synchronized( objMainProcess ) {
            bChanged = true;
            try{
                objMainProcess.notify();
            }catch( IllegalMonitorStateException e ) {}
    private static boolean GetState() {
        if( objMainProcess == null ) return false;
        synchronized( objMainProcess ) {
            if( bChanged) {
                SendMessage();
                bChanged = false;
                return true;
            try {
                objMainProcess.wait();
            }catch( InterruptedException e ) {}
            return false;
    }

Thanks DrClap for your reply. Everything you said is right. It is not easy to make them alternate since SetState() could be called from different places where the state could be anything else but a status message. Like a GREETING message for example. It is a handshaking message but not a status message.
Again as you said, There is a reason I can't call sendMessage() inside setState().
The only way I was able to do it is by having a counter of the number of notifies that have been called. Every time notify() is called a counter is incremented. Now instead of just checking if "changed" flag is true, I also check if notify counter is greater than zero. If both true, I send the message. If "changed" flag is false, I check again if the notify counter is greater than zero, I send the message. This way it works, but it is kind of a patch than a good design fix. I am yet to find a good solution.
Thanks,
B.D.

Error while offsetting a variable

Hello Experts
I want to display the data for last 5 years in my query. So I tried using the SAP exit variable Current Calendar Year (0CYEAR) and the offset it by 5. However, I am getting the following error message for the query "System error in program SAPLRR12 and form REP_ASSIGN_INITIAL_OPT-01"
Any Help on this is appreciated and points will be assigned.
Thanks

Thanks Chetan for your prompt reply. I have assigned points.
But I would appreciate if you help me clear my understanding of offseting a variable.
Say if the Current Calendar Year variable returns 2008, then will offseting that variable by 5 return me the data for years 2008, 2007, 2006, 2005 , 2004. Or, will it just return me the data for 2008 - 5 = 2004 only.
Thanks
Rishi

Error while Creating Presentation variable

Hi,I am new to OBIEE
I am facing this error:
"A numeric value was expected (received "max("Sales Measures".Dollars)").
Error Details
Error Codes: EHWH2A7E"
1.I am using paint rpd.I want to use presentation variable.
2.So i took two column in criteria 1.Region 2. Dollars
3.In Dollars edit formula ,I created presentation variable i.e. @{Doller_presentation}{max("Sales Measures".Dollars)} in the column formula.
4.And In the same column i use filter
Add ->presentation variable->variable exp =Doller_presentation and default =max("Sales Measures".Dollars)
5.I have added this request on dashboard page,but error is coming.
6.Also i have created dashboard prompt,
Set presentation variable to "Doller_presentation"
and in column formula :@{Doller_presentation}{max("Sales Measures".Dollars)}
and took that prompt on the same dashboard page.
so promt with 2 values are coming.1.All choces 2.13087528..may be ths is max value of dollar but on click its showing error as
"Odbc driver returned an error (SQLExecDirectW).
Error Details
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 42021] The query does not reference any tables. (HY000)
SQL Issued: SELECT 13087529 FROM Paint ORDER BY 1"
I am confuse abt use of presentation variable
Please Help,
Thanks
Kapil
[email protected]
Edited by: user13098263 on May 9, 2010 10:58 PM
Edited by: user13098263 on May 9, 2010 11:01 PM
Edited by: user13098263 on May 9, 2010 11:02 PM
Edited by: user13098263 on May 9, 2010 11:04 PM

Hi Rachit
You answered my doubt.This one really works . Thanks a lot !
But i have one more doubt i.e if have created the Presentation variable in the dashboard prompt and I want to use it in a report
i.e the scenario is If I have created a new column i.e " Revised Salary " in the Presentation Services and want the values to be entered there dynamically upon end users choice. For ex the end user selecrts value of 1 then the report would display an increament of 500 to all the employees in the " Revised Salary " column and if the end user select value of 2 .. the report would display a decrement of 500 in the " Revised salary column".
I am getting the following error :
========================================================================
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 59001] Binary Logical operation is not permitted on VARBINARY, INTEGER operand(s). (HY000)
SQL Issued: SELECT "D0 Time"."T05 Per Name Year" saw_0, "D2 Market"."M04 Region" saw_1, "D4 Product"."P01 Product" saw_2, "D1 Customer"."C1 Cust Name" saw_3, "F1 Revenue"."1-01 Revenue (Sum All)" saw_4, CASE WHEN 0='1' then "F1 Revenue"."1-01 Revenue (Sum All)" +500 else "F1 Revenue"."1-01 Revenue (Sum All)" - 500 end saw_5 FROM "Sample Sales" ORDER BY saw_0, saw_1, saw_2, saw_3
========================================================================
Please NOTE : The column on which I want to do an increament is : "F1 Revenue"."1-01 Revenue (Sum All)"
Thanks

Error message into a Variable.

Dear users,
I have a rather usual (unusual from the weekend beers for me though!!) query which I can't figure out a proper way to implement.
My requirement is like this:
I have a message class in which I want to define a text 'Employee number & not found'.
I want to use this in the program, but not to raise this error. Instead, I want to move this error message with the Employee number into a Character(200) variable.
So instead of using MESSAGE e0xx(messageclass) USING employee number, I would like to move the error text into a variable which looks like:
lv_text = e0xx(messageclass) USING '1234' which stores the text 'Employee number 1234 not found' in lv_text.
How would I acheive it??
Thanks, V!

Try tis way
message e999(00) with i_emp-empno into lv_text.
press f1 in message will provide you more details
a®

Error while creating a Characteristic Variable with Replacement Path

Hi all,
    I am trying to create the Characteristic Variable ZVLOWDT (Low Date') with Replacement Path on characteristic ZSTARTDT (Start Date) and it gives the error 'Source to replace 'Low Date' is not defined.
   I have created a User Entry Variable VAR_DATE (Start Date) with interval like '01/01/2009 - 01/15/2009' and Customer Exit variable ZVCPDAY (does some calculation based on the input of VAR_DATE) on the same ZSTARTDT characteristic. I want to get the 01/01/2009 (lower range date of the selection) into this Characteristic Variable ZVLOWDT. We are in BI 7.0 and the following are it's properties:
General Tab:
Description: Low Date
Technical Name: ZVLOWDT
Type of Variable: Characteristic Value
Processing by: Replacement Path
Reference Characteristic: ZSTARTDT Start Date
Details Tab:
Variable Represents : Single value
Variable is: Mandatory
Variable is Ready for Input : unchecked
Replacement Path Tab: Replacement Rule
Replace Variable with : Variable
Variable : VAR_DATE
Replace with : KEY
Why I am getting this error, PLEASE ?
Thanks,
Venkat.

Hi Khaja,
   We could derive a Variable value from another Variable with out Customer Exit. There is a white paper.
First have the User Entry Variable (ZV_X) and it accepts the date range like '01/01/2009 - 01/31/2009'. Next create the Characteristic variable (ZV_Y) of Replacement Path for which source variable will be ZV_X and we could get the 'FROM Date' (01/01/2009) from the selection (ZV_X) into it (ZV_Y).
While creating the Characteristic variable (ZV_Y) of Replacement Path, I didn't find my newly created ZV_X variable in the list of available variables under 'Variable' header in 'Replacement Path' tab and it is causing the error 'Source to replace variable ZV_Y is not defined'. How could I create the Characteristic variable of Replacement Path, PLEASE ?
Thanks,
Venkat.

Error while assigning a character value to a numeric variable.

I fire a sql statement and check the number of rows returned by the sql.
I check this result with the application logs.
The application logs keeps the sqls fired by the application and the no of rows returned, in the example below the sql returned 8454 rows.
My script compares the two results.
***********Application Log***********
4/14/2008 11:15:01 AM: 0059 SQL SELECT "CLUSTER_CD",
4/14/2008 11:15:01 AM: 0060 "PRODUCT_DESC",
4/14/2008 11:15:01 AM: 0061 "TEAM_CD"
4/14/2008 11:15:01 AM: 0062 FROM "OPS$TMS"."MAP_CLUSTER_TEAM_PROD"
4/14/2008 11:15:01 AM: 3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD, 8,454 lines fetched
***********Application Log***********
My script:
#!/bin/ksh
typeset -i resA
typeset -i resB
opstms_conn_string="abc/[email protected]"
set `sqlplus -s $opstms_conn_string << EOF
set pages 0
WHENEVER SQLERROR CONTINUE
SELECT count(*)
FROM MAP_CLUSTER_TEAM_PROD;
exit
EOF`
resA=$1 ##returns 8454
resB=`grep '3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD,' BCVP_Main_Loader.qvw.log | awk '{print $10}'`
##resB returns 8,454
## here i get syntax error
if [ $resA -eq $resB ]; then
echo "QA passed for sql1"
else
echo "QA failed for sql1"
fi
The problem is as resB is integer variable it does not accept character value: 8,454 so returns a syntax error:
How do I change the value assigned to resB into a numeric variable?
error:
+ grep 3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD, BCVP_Main_Loader.qvw.log
run.ksh[52]: 8,454: syntax error

Change:
resB=`grep '3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD,' BCVP_Main_Loader.qvw.log | awk '{print $10}'`
to this:
resB=`grep '3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD,' BCVP_Main_Loader.qvw.log | awk '{print $10}' | tr -d ,`
to drop the comma. Or you could do it in awk(1):
resB=`grep '3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD,' BCVP_Main_Loader.qvw.log | awk '{ gsub( /,/, "", $10 ); print $10}'`
Or you could to it all in awk(1):
resB=`awk '
/3 fields found: CLUSTER_CD, PRODUCT_DESC, TEAM_CD/ {
gsub( /,/, "", $10 )
print $10
' BCVP_Main_Loader.qvw.log`
(This example was not tested, it's just for a model.)
Someone more of an SQL guru than I can probably tell you how to change your numeric locale to avoid presenting those commas in the first place and avoid the problem.
HTH

Error while running a query-Input for variable 'Posting Period is invalid

Hi All,
NOTE: This error is only cropping up when I input 12 in the posting period variable selection. If I put in any other value from 1-11 I am not getting any errors. Any ideas why this might be happening?
I am getting the following error when I try and run a query - "Input for variable 'Posting Period (Single entry, mandatory)' is invalid" - On further clicking on this error the message displayed is as follows -
Diagnosis
Variable Posting Period (Single Value Entry, Mandatory) is used as a lower limit (X) and an upper limit () in an interval selection. This limit has the value #.
System Response
Procedure
Enter a different value for variable Posting Period (Single Value Entry, Mandatory). If the value of the other limit is determined by another variable, you can change its value also.
Procedure for System Administration

OK.
Well, if the variable is not used in any interval selection, then I would say "something happened to it".
I would make a copy of the query and run it to check if I get the same problem with period 12.
   -> If not, something is wrong in the original query (you can proceed as below, if changes to original are permitted).
If so, then try removing the variable completely from the query and hardcode restriction to 12.
   -> If problem still persists, I would have to do some thinking.
If problem is gone, then add the variable again. Check.
   -> If problem is back, then the variable "is sick". Only quick thing to do, is to build an identical variable and use that one.
If problem also happens with the new variable, then it's time to share this experience with someone else and consider raising an OSS.
Good luck!
Jacob
P.S: what fisc year variant are you using?
Edited by: Jacob Jansen on Jan 25, 2010 8:36 PM

Error in using a variable

Hi All,
I have got 2 packages, A & B. Package A includes package B and some variables.
My question out here is that i am using assigning some values to variables in the package B, i want those values to be reflected and be usable in the package A.
Can you please help.
Thanks,
Nithesh B

Hi Nitesh,
Please try the below steps and let me know still you face issue on this :-)
You can ping me on [email protected]
Steps :-
Ist create a Gobal variable say GLOBTest (historise , to veiw the result)
create a local variable say LocTest (historise , to veiw the result)
Now in first pcakage say PKG1
step 1 : drag and drop the GLOBTest Variable and select the mode as declare variable
step 2: call the second package scenario (say PKG2)
step 3: drag and drop the variable LocTest as assign variable :- and in assign tab put #Global.GLOBTest
Now in pcakge 2 (PKG2)
Drag and drop the global variable GLOBTest as assign mode and put the value as "This is a test case"
generate the scenarios and start the package 1 (PKG1)
once its executed without error , open the LocTest and check the historise tab , you can see the value of the global variable whcich you assigned from the child package.
Regards,
Rathish A M

Filename in J2SE Adapter with Variable Substitution

Hello,
Within the J2EE receiver fileadapter (and ftp) from SP13 it is possible to compose the target filename and directory based on the payload of a message using variable substitution.
I wonder if it is also possible to use variable substitution with the J2SE fileadapter. For this it is not documented but i thougth that the same java libraries are used for the J2EE an J2SE file-adapters.
Aybody??
Really Nobody??
Message was edited by: Emile Hermans

Hello,
the J2SE Adapter does not support variable subsition. Therefore we created our own class which gets called from the main SAP XI class "XMB2FileProcessor.class" wich is in the jar "aii_msg_adapter.jar". In your own class you can do what ever you need to chane the file name. In the configuration you can set your own parameter to search the payload for a string you want to replace. We also had to come up with our own timestamp, e.g. file2005-11-10 which SAP does not let you do, only the full timestamp is possible.
One other nice thing is that you can develop our JAVA class local and test it with your local J2SE Adapter Engine on you PC before you deploy it.
Steps to do:
1. JAD the SAP class
2. Put a call in the SAP class
3. Compile the class
4. Put the class back in the archive
5. Create your own class
6. Create a jar file for it
7. Put the jar file in the tech_adapter directory
8. Change the run_adapter start cmd to include your jar file
It works great, the only issue is if you patch the J2SE engine you have to do step 1 to 4 again but that should it very easy to do.
Cheers
Stefan

Is null and regular value in where ($variable)

is there any polibility to create select depend on value in where ?
select count(x) where y = $variablebut if variable is NULLit doesn't work cause must be IS NULL or IS NOT
select count(x) where y is $variableIs there any posibility to make it working with null and regular variable?

try:
select count(x) from <yourtable> where nvl(y,<not_possible_value>) = nvl($variable,<not_possible_value>);where <not_possible_value> is a value that is not possible for column y.
E.g. if y always is a positive number you could use the value -1.

Get variable values from a stored procedure

I am using SQL 2008R2 and I want to replace a view inside a stored procedure with a new stored procedure to return multiple variable values. Currently I am using the code below to get values for 4 different variables. I would rather get the 4 variables
from a stored procedure (which returns all of these 4 values and more) but not sure how to do so. Below is the code for getting the 4 variable values in my current sp.
DECLARE @TotalCarb real;
DECLARE @TotalPro real;
DECLARE @TotalFat real;
DECLARE @TotalLiquid real;
SELECT @TotalCarb = ISNULL(TotCarb,0),
@TotalPro = ISNULL(TotPro,0),
@TotalFat = ISNULL(TotFat,0),
@TotalLiquid = ISNULL(TotLiq,0)
FROM dbo.vw_ActualFoodTotals
WHERE (MealID = @MealID);

You can replace the view with inline table valued user-defined function:
http://www.sqlusa.com/bestpractices/training/scripts/userdefinedfunction/
See example: SQL create INLINE table-valued function like a parametrized view
Kalman Toth Database & OLAP Architect
SQL Server 2014 Design & Programming
New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

I am trying to connect Dashboard shared variables to a server on a different subnet. Any ideas?

My goal is to control a device that is connected to our wired network using an Android tablet via Dashboard. I have created a vi with shared variables that controls the device as expected when it runs on a computer that is connected to the same wired network. The problem is that my Android tablet running the Dashboard app cannot connect to the shared variables on the PC running the vi on the wired network.
Our wireless network is on a separate subnet from our wired network. I am able to ping my Android tablet from the PC on the wired network but when I try to connect a variable in Dashboard, the PC running the SVE cannot be found. I tried listing it in the alternative server settings window and it still did not work. The only way I have been able to get around this is to run the vi which launches the server on a laptop that is connected to the wireless network and the wired network at the same time. My tablet can then find the server and my VI can connect to the instrument that is connected to the wired network. The laptop is somehow acting as a bridge between the subnets. I need to find a way for the Dashboard app to connect directly to the PC on the wired network. My PC IP address is 192.168.0.105. My Android IP address is 192.168.10.93.

Data Dashboard doesn't care about subnets, but it has to be able to access the server using the right ports. There is probably a firewall blocking the shared variable ports. This document explains how to configure a firewall to allow shared variables to be accessed. Your challenge will probably be to figure out where the firewall is and how to configure it.
It is also possible that the router that your Android device is connected to doesn't know how to route to the other network. Again, that is an issue with your router that you need to resolve.

Variabilizing variables

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