Question

Redefine True = -1 to True = 1?

Asked by: charos

Is it possible to redefine the value of True in MS Access?

Currently True = -1

however,

I have a 'mixed' application where a Boolean  can only be 0 or 1. This knocks MS Access out of the park for this particular system.

Thanks in advance!

- Bill

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Asked On
2008-01-03 at 19:51:48ID23057754
Tags

Visual Basic MS Access

,

97 and Later

Topic

Microsoft Access Database

Participating Experts
4
Points
500
Comments
12

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Answers

 

by: DatabaseMXPosted on 2008-01-03 at 19:55:13ID: 20579875

Basically, True = Not False ... which is 0

mx

 

by: DatabaseMXPosted on 2008-01-03 at 19:57:41ID: 20579892

So, basically you can use things such as:

If X <> False Then
   ' X= = true

So ... if you always test for False or Not False then you s/b ok.
mx

 

by: flavoPosted on 2008-01-03 at 21:01:02ID: 20580088

Access will cast 1 to be True, so you need to handle this when passing to the other application only. This can simply done with

Abs(MyBooleanField)

This will cast True (-1) to a number then get the absolute value, 1. Abs(False) = 0

Does this help/

Dave

 

by: clarkscottPosted on 2008-01-04 at 03:26:05ID: 20581147

You may run into this issue again..... in some cases 1 = true, in other cases -1 = true.  I've gotten into the habit of always checking for FALSE (which is always 0) instead of checking for True.

Scott C

 

by: JDettmanPosted on 2008-01-04 at 05:40:45ID: 20582006

To directly answer your question:

Is it possible to redefine the value of True in MS Access?

  The answer is no.  The others have already given your the standard work arounds.

JimD

 

by: charosPosted on 2008-01-04 at 06:00:55ID: 20582114

All,

Thank you very much. Yes, all of my system documentation identifies that False = 0 and True != False only. I have a different group of developers working in .NET having kittens regarding the -1 that gets populated in my Access user interface for true booleans. Recently they informed me that their interface 'will not work' if there are -1 representing true.  (Oh, brother!).

Thanks for your attempts to help me.

- Bill

 

by: clarkscottPosted on 2008-01-04 at 09:35:23ID: 20584295

Well, here's the reality of it.   The coders must adjust their code to examine for FALSE instead of TRUE.  Must of us 'older-timers' have been bitten by this bug in the past and know that things can change (like adding Access tables to the mix).

Back to school....

Scott C

 

by: DatabaseMXPosted on 2008-01-04 at 10:21:01ID: 20584719

"The coders must adjust their code to examine for FALSE instead of TRUE."

Which, is where we pretty much started at the top here :-)

mx

 

by: charosPosted on 2008-01-05 at 17:43:37ID: 31418846

Bad news indeed, but thanks. I thought this was the case. Of course, it is possible that someone, somewhere will have an environment variable or some-such.

But for now, thanks for the answer.

 

by: DatabaseMXPosted on 2008-01-05 at 17:46:40ID: 20592141

??

 

by: charosPosted on 2008-01-05 at 18:00:42ID: 20592187

The person credited answer my specific question. Current standards understand False=0, True <> False

Thanks very much for yours, and everyone's participation in my question.

- Bill

 

by: DatabaseMXPosted on 2008-01-05 at 18:08:06ID: 20592203

Guess it depends on what you meant by 'redefine' ?  We showed you several several ways to 'redefine' . aka viable work arounds.  If you meant, can you change Access internally, then No.

mx

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