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| nuking an &var | Login/Join |
| Expert |
i thought there was a way to do this... but i must have been dreaming... -SET &var = 'fred'; -TYPE &var -SET &var = ; -TYPE &var lo and behold &var is still 'fred'... i was sure that = ; would nuke the &var and force &var.EXIST to 0 ; Am i nuts? Any wizardrous ideas?
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| Expert |
I've found that you cannot have the space between the = and the ; Use -SET &var =; Waz...
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| Expert |
Dialogue Manager variables are like cockroaches, nothing will kill them, not even nukes. I don't think there's a way to delete variables. How about setting them to a special value (e.g. 'zyzyzyz') and add a test to the line you're testing existence? -IF &var.EXISTS EQ 0 OR &VAR EQ 'zyzyzyz' GOTO BYEBYE; Francis  Give me code, or give me retirement. In FOCUS since 1991 Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server | |||
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| Expert |
doesn't work: -SET &var = 'ASDFAASDSD'; -SET &var=; -? &v Francis Give me code, or give me retirement. In FOCUS since 1991 Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server | |||
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| Expert |
It kinda does. Run this: -SET &var = 'ASDFAASDSD'; -SET &var=; -? &v -TYPE &var.LENGTH -TYPE &var Very weird. It shows up in the list but really isn't there.  Ginny --------------------------------- Prod: WF 7.7.01 Dev: WF 7.6.9-11 Admin, MRE,self-service; adapters: Teradata, DB2, Oracle, SQL Server, Essbase, ESRI, FlexEnable, Google | |||
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| Expert |
Don't trust -? & -SET &var = 'ASDFAASDSD'; -TYPE &var.EXISTS -TYPE &var -SET &var=; -? &v -TYPE &var.EXISTS -TYPE &var Waz...
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| Expert |
Very interesting! Francis Give me code, or give me retirement. In FOCUS since 1991 Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server | |||
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| Virtuoso |
I don't think you can remove the existence of a variable once its existence has been established with a set value. My approach for similar needs has been to -SET &var=''; which removes the value (well actually the value is supposedly a space with the &var.LENGTH=1. That means if I need to test that parm later I need to evaluate for the possibility of a space. Blast those darn cockroaches!! Regards, Darin In FOCUS since 1991 WF Server: 7.7.04 on Linux and Z/OS, ReportCaster, Self-Service, MRE, Java, Flex Data: DB2/UDB, Adabas, SQL Server Output: HTML,PDF,EXL2K/07, PS, AHTML, Flex WF Client: 77 on Linux w/Tomcat | |||
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| Expert |
-SET &var = 'ASDFAASDSD'; -TYPE &var.EXISTS -TYPE &var -SET &var=; -? &v -TYPE &var.EXISTS -TYPE &var Results: -SET &var = 'ASDFAASDSD'; -TYPE &var.EXISTS 1 -TYPE &var ASDFAASDSD -SET &var=; -? &v CURRENTLY DEFINED & VARIABLES STARTING WITH 'v': &var = ASDFAASDSD -TYPE &var.EXISTS 0 -TYPE &var (FOC295) A VALUE IS MISSING FOR: &var Waz...
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| Expert |
Waz, I guess that was from 7.1.6 because I get the same. Could it be to do with the fact that I've only ever seen 'roaches in the states?   T
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| Expert |
ohhhh very interesting indeed. thanks waz I did some more testing this morning and 'dont trust -? &' is spot on! cockroaches!  i think we've just renamed &vars as 'cockroaches'....This message has been edited. Last edited by: susannah,
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| Guru |
Can somebody explain to me what this mean - Is it "Does &var have a value?" or "Is the variable &var existed?" Sorry about the confusing nested questions, because I am very very confused here. Hua Developer Studio 7.6.11 AS400 - V5R4 HTML,PDF,XLS | |||
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| Expert |
It means "does the variable exist". This could be useful when the variable may or may not have been passed from the launch form, or when created in a Dialogue Manager loop... Francis Give me code, or give me retirement. In FOCUS since 1991 Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server | |||
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| Guru |
Francis, Thanks for the explaination. I got the misconception that variables are loosely defined as long as they appear anywhere in the fex, you must supply values at the execution point, or the WF intepreter will choke. As for parameters passing to a fex, if more variables being passed, the fex ignores the extra ones and continue to run, but if fewer variables passed, then the fex will prompt for values of the the missing vars or defaults must be given inside the fex. That is why I thought &var.EXISTS is testing for value, not the variable itself. -SET &var = 'ASDFAASDSD'; -TYPE &var.EXISTS -TYPE &var -GOTO BYPASS -SET &var=; -BYPASS -? &v -TYPE &var.EXISTS -TYPE &var Like cockroaches for sure, they've been there wether we want to see them or not. HuaThis message has been edited. Last edited by: Hua, Developer Studio 7.6.11 AS400 - V5R4 HTML,PDF,XLS | |||
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| Virtuoso |
Well, it's kind of the same thing. A variable cannot exist unless it has a value, whether it's a blank or zero or whatever, but it cannot be missing. It is initialized by a -DEFAULT, -SET, or -READ. The .EXISTS operator is just an easy binary way to check if a variable has been initialized without regard to what that value might be. Here's one example of how I have used it. If you've ever used an indexed variable for multi-select controls, you know that if more than one value is passed, an &var0 is created containing the number of values selected and then &var1, &var2, etc. for the individual values. If only one value is passed, you only need to use &var. So I would evaluate &var0.EXIST to branch into a DM routine for evaluating multiple parameter values if it is 1 or just use the &var value if it is 0. Regards, Darin In FOCUS since 1991 WF Server: 7.7.04 on Linux and Z/OS, ReportCaster, Self-Service, MRE, Java, Flex Data: DB2/UDB, Adabas, SQL Server Output: HTML,PDF,EXL2K/07, PS, AHTML, Flex WF Client: 77 on Linux w/Tomcat | |||
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| Guru |
Darin, I haven't used an indexed variable, could you be so kind to give me an example? I wonder what is it like to do -? &var before you test &var0.EXISTS. Thanks, Hua Developer Studio 7.6.11 AS400 - V5R4 HTML,PDF,XLS | |||
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| Expert |
One example of indexed variables: -SET &ECHO=ALL; TABLE FILE CAR PRINT COUNTRY BY COUNTRY NOPRINT ON TABLE SET HOLDLIST PRINTONLY ON TABLE SAVE AS H001 END -RUN -SET &N = &LINES; -REPEAT END1 FOR &X FROM 1 TO &N STEP 1; -READ H001 &COUNTRY.&X.A10. -END1 -? &COUNTRY Francis Give me code, or give me retirement. In FOCUS since 1991 Production: WF 7.7.05M, Dev Studio, BID, MRE, WebSphere, DB2 / Test: WF 8.1.05M, App Studio, BI Portal, Report Caster, jQuery, HighCharts, Apache Tomcat, MS SQL Server | |||
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| Expert |
FYI I get the same results for versions:
Its been around for quite a while. Waz...
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