GTL Problem Checking existance of variables

Question

Hi,
I'm using PD 15.3 on a win7 System.
In a pdm targeted to Oracle DBMS. Enhancing the generation of triggers I'm trying to request a variable not sure if it exists.
I use:
.set_value(v1,,new)
%v1?% shows: "true"
%v2?% Shows "true" while "false" is expected since v2 is not defined.
Trigger source will be generated from templates which are defined within an XEM model Extension. Under metaclass trigger I defined a "Generated File" which containes the same code snippet as above. The generated file shows up when previewing the trigger and there coding works as expected:
%v1?% shows "true"
%v2?% shows "false"
GTL seems to Interpret question marks different depending on use within a DBMS-Extension or use within XEM-Extension.
Can anybody help?

Answer 1

Hi,
The is around evaluation of trigger text. This does not use the same mechanisme as the GTL.
This should be considered as a bug.
A workaround is to define under trigger profile a new template "isDefined" with the following (which use the bug behavior, so once the bug is fixed, the following should not work anymore)
<<
.set_value(percent, "%", new)
.set_value(varname, "%percent%%@1%%percent%", new)
.if(%varname%==%*@1%)
false
.else
true
.endif
>>
What is used here is that the variable evaluation returns the variable name when it is not defined.
To check this, I rebuild the variable name with percent around it and compare with the variable evaluation (%*@1%)
In your trigger template, you replace the "%v1?% with %isDefined(v1)% and it should returns the correct value.
Marc