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Format an ADO.NET boolean as "0" or "1"

Posted on 2006-12-01
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Last Modified: 2008-01-09
I am converting answers for a survey to a specified format. I need to handle boolean questions, which can be skipped. Here is the rubric

ADO.NET Value     Output
DBNull                  ""
true                     "1"
false                    "0"

Can someone come up with something simpler than this:

[code]
        const string missing = "";
        private static string GetBoolOutputFromDataRowView(DataRowView drv, string columnName)
        {
            object obj = drv[columnName];
            if (obj == System.DBNull.Value)
                return missing;
            else
                return ((bool)obj == true) ? "1" : "0";
        }
[/code]
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Question by:anyoneis
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9 Comments
 
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Nightman earned 500 total points
ID: 18057911
That looks good enough to me. Do you have any specific concerns about this approach?
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by:Nightman
Nightman earned 500 total points
ID: 18057924
A simpler approach could be to do this in SQL, and not have to handle it in ADO at all.

e.g.
SELECT CASE  WHEN MyColumn IS NULL THEN 'Missing' WHEN MyColumn=1 THEN '1' ELSE '0' END result FROM MyTable
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Author Comment

by:anyoneis
ID: 18062561
Thanks, Nightman. I have the feeling I am overlooking some formatting idiom or apparatus, so I thought I would ask.

Also, I don't have any control over the SQL, I am getting a dataset and datatable from the vendors library, so changing the SQL is out of the question.

David
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Expert Comment

by:Nightman
ID: 18062586
The only thing that I would do would be to place curly braces around the if else statements ( if {} else {}). This doesn't change the execution path of your code, but it makes it 100% clear to anyone that is reading your code where the scope is.

There are plenty here that will disagree with me, but from experience working in large teams with shared source, having everything clearly defined makes integration, maintenance and debugging easier.
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Expert Comment

by:jagadeeshbandlamudi
ID: 18069998
You want to return either true or False right, then why do you want to use  'string missing = "" '. If anything other than 1 just return False
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Author Comment

by:anyoneis
ID: 18074666
No, I need "missing". if the column is null, I want to return an indication that the field was missing. This might be a "." for a SAS data file, or a blank for a pipe-delimited file.

What I was looking for was some revelation on formatting nullable types, or an approach with a custom format provider.
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Expert Comment

by:jagadeeshbandlamudi
ID: 18074851
Then I guess whatever you are doing is right.. This might be of some help to you
  \
            public type format(DbType dbType)
              {
                     switch(dbType)
                         case DbType.Boolean: return typeof(bool);
                          break;
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Expert Comment

by:jagadeeshbandlamudi
ID: 18074853
public type format(DbType dbType)
              {
                     switch(dbType)
                         case DbType.Boolean: return typeof(bool);
                          break;
                       default:
                             return typeof(string);      
}
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Author Comment

by:anyoneis
ID: 18128457
I guess we are done with this. Thanks for your input, everyone!
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