ADO.NET :: Query From Multiple Datatables?
Nov 25, 2010
I am trying to create a stock scanner which allows users to filter stocks based on multiple criteria that they select.
Like the following example with 2 criteria:
Criteria 1 Filtered Result: StockA, StockB, StockC, StockD
Criteria 2 Filtered Result: Stock B, Stock C, StockE, StockF
SCANNER RESULT: Stock B, StockC (ideally this result would be displayed in a GridView)
Now this seems like an easy task for a simple SQL JOIN statement, but the problem is that the SQL statements I've written for some criteria are already so complex that it's unthinkable to combine them further by using a SQL JOIN statement.......(yes I've tried and failed).
I think the only way to accomplish this is to put each criteria-filtered result into an array or datatable, and then try to query to see which stocks exist in all the arrays/datatable (in other words satisfy all criteria), and to display these stocks in a gridview. After doing some research online, it is possible to do query from multiple datatables by either using:
JOINVIEW(DataRelation) or LINQ
But which one is the best method (if it works)? I didn't consider using a loop for this since it would be too inefficient, especially if a user select many criteria.
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DataTable 1 :-
Caption |ID
------------
Caption1|1
Caption2|2
Caption3|3
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Name |ID
------------
Name1|1
Name2|2
I want to compare the above two data tables and fetch the value "Caption3" so I can display a message on screen that "No name for "Caption3" exist!"
I have tried merging as follows but it's fetching DataTable 2 as it is in dtTemp !
datatable1.Merge( datatable2);
DataTable dtTemp = datatable2.GetChanges();
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if (datatable2.Rows.Count != datatable1.Rows.Count)
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How do I fetch those "CAPTIONS" whose corresponding "NAMES" do not exist?
Note:- Rows in both datatables will vary based on some logic. What I want is to fetch that CAPTION from datatable1 who's KCID doesn't exist in datatable2.
edit:- How else do I loop through datatable1's rows and check which ID(from datatable1) doesn't exist in datatable2 and then print those captions on my page?
@CodeInChaos:: I have not worked with Linq-To-Objects at all so not able to understand your code :/
Is there any other way to loop through that datatable and fetch "caption " who's correcponding "Name" doesn't exist in the datatable2?
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