Binding optional parameters

  • Thread starter Thread starter Mark Baldwin
  • Start date Start date
M

Mark Baldwin

I have a web page with various controls that supply parameters to an
ObjectDataSource. The ObjectDataSource has various methods that allow for
filtering of the results...GetProductsByID(), GetProductsByIDAndDate()...etc

Because the parameters are optional, I have to make a methods that take all
variantions of these parameters, so if I have 3 parameters, I need 7
methods, I then have to write code to call the correct method depending on
which parameters have been selected.

I am just wondering if there is an easier way to do this - maybe have one
method with all parameters and then let the ObjectDataSource determine the
parameters on the query?
 
Write a stored procedure that accepts the parameters. The select ends up
something like:

SELECT * FROM Table1
WHERE ((column1 = @column1) OR (@column1 IS NULL))

repeat for other optional parameters.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
http://gregorybeamer.spaces.live.com

*************************************************
Think outside of the box!
*************************************************
 
Hi Mark,

IMO, I would suggest you create a single method which take the maximum
count of parameters and determine the select/filter code logic in this
method(or you can create several private/internal helper methods which do
select/filter according to the different paramter combinations). This is
because ObjectDataSource can only be configured to use a single Select
method at a time and it is not quite good to change it at runtime, so it's
better to only expose one public select method in our business logic class.


As Gregory mentioned, you can check the paramter value and do select
filtering in stored procedure(at database layer). Instead, you can also
move the parameter checking and select/filter logic in business class code.
It's up to you according to the detailed scenario.

If you have any further questions, please feel free to post here.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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Hi Mark,

Have you got any further ideas on this issue? If you have any other
questions like to discuss on this , please feel free to post here.


Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.
 
I have modified my project to use a business layer. This meant removing all
of the SqlDataSource objects and replacing them with ObjectDataSource. These
then link to the code in the business layer that includes one function that
takes all possible arguments, which DataSet method is called to get the data
however, depends on which parameters are passed.

Seem to work great! Thanks for your help...
 
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