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Boolean - different behaviour in QVW and QVD load script?

Hi,

I have a rather strange problem with the folowing script code:

LOAD *, If(WildMatch(...) > 0, True(), False()) AS is_spare_part RESIDENT tmp_Item;

When I use this code in a QVD, the field is_spare_part contains a boolean value (I assume of type dual) which gets displayed as True/False in the GUI and as 0/-1 when using Num(is_spare_part). The same script - when implemented in a QVW - creates a field that does contain the correct values 0 and -1 but the values would not be displayes as True/False in the GUI. Somehow, the field does not get recognized as a boolean.

It looks as if QV (QV11 SR2) treats booleans differently in QVD and QVW scripts. Or am I missing something? I just like to understand what is going on here. Your input / feedback is really appreciated.

Kind regards,

Thomas

1 Solution

Accepted Solutions
Employee
Employee

Re: Boolean - different behaviour in QVW and QVD load script?

Yes, you are right that there are glitches in the formatting of boolean values. Sometimes the formatting as True or False fails. I haven't investigated it more thouroughly so I cannot give you the details.

However, it just concerns the formatting - not the evaluation. In fact, any non-zero number is interpreted as True in logical expressions. And zero is interpreted as False. So you really don't need the "If(WildMatch(...) > 0, True(), False())". You can use "WildMatch(...)" directly as boolean.

HIC

2 Replies
Employee
Employee

Re: Boolean - different behaviour in QVW and QVD load script?

Yes, you are right that there are glitches in the formatting of boolean values. Sometimes the formatting as True or False fails. I haven't investigated it more thouroughly so I cannot give you the details.

However, it just concerns the formatting - not the evaluation. In fact, any non-zero number is interpreted as True in logical expressions. And zero is interpreted as False. So you really don't need the "If(WildMatch(...) > 0, True(), False())". You can use "WildMatch(...)" directly as boolean.

HIC

Not applicable

Re: Boolean - different behaviour in QVW and QVD load script?

Hello Henric,

Thanks very much for your feedback and for your tip to use the WildMatch directly. I was not aware of this option. This simplifies the expression somewhat.

Kind regards,

Thomas

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