Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Delphi, Mysql and boolean

Posted on 2008-10-06
6
Medium Priority
?
748 Views
Last Modified: 2013-11-05
Hi,

I have a problem with delphi and mysql.. when i save a boolean in the database, the false is 0 and the true is -1.

Is there any way to force mysql to save it as 1 instead of -1?

Thanks
Luc
0
Comment
Question by:Mysterion
  • 3
  • 2
6 Comments
 
LVL 15

Expert Comment

by:mikelittlewood
ID: 22652933
Some databases use -1 as true, some use 1.
Only other way I can think would be to not use boolean and use smallInt
0
 
LVL 38

Accepted Solution

by:
Geert Gruwez earned 900 total points
ID: 22657383
in what context are you using the loaded value ?

you could use
FieldByName('FIELDNAME').AsString = '0'
for False and

FieldByName('FIELDNAME').AsString <> '0'
for True

or is it the .AsBoolean which allways returns false ?
0
 
LVL 38

Expert Comment

by:Geert Gruwez
ID: 22657404
looking at the MySQL docs the value is stored as 0 or 1 into a TinyInt(1) field

http://dev.mysql.com/doc/refman/6.0/en/numeric-type-overview.html

how do you store the value into the mysql database ?
and what components do you use for this ?
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 46

Assisted Solution

by:aikimark
aikimark earned 600 total points
ID: 22658167
@Luc

Why would it matter how any database engine stores its boolean data values as long as your program accurately reflects their TRUE and FALSE values when records are retrieved?

If you need to sum a boolean column to determine the number of TRUE values, then take the absolute value of the SUM() function.
0
 
LVL 38

Expert Comment

by:Geert Gruwez
ID: 22666761
Please read the help before you ask your next question
especially about accepting answers

http://beta.experts-exchange.com/help.jsp
0
 
LVL 46

Expert Comment

by:aikimark
ID: 22668376
@Geert_Gruwez

Please be a bit more specific in what you are urging Mysterion to consider or change in evaluation of future answers.

Your answer was very language specific, where my answer was database/SQL specific.  Somewhere between the two of our answers, Luc seems to have gotten an acceptable work-around.  Looking at the new grading recommendations, I don't see anything amiss in the B grade and the split points.
0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
In a question here at Experts Exchange (https://www.experts-exchange.com/questions/29062564/Adobe-acrobat-reader-DC.html), a member asked how to create a signature in Adobe Acrobat Reader DC (the free Reader product, not the paid, full Acrobat produ…
Screencast - Getting to Know the Pipeline

971 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question