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In-Memory SQL Engine

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Submitted on: 9/7/2005 10:07:21 AM
By: Emmet Gray  
Level: Intermediate
User Rating: By 11 Users
Compatibility: VB.NET
Views: 15466
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     Wouldn't it be nice if you could use good-ole SQL language to execute a Select statement against a set of locally-cached DataTables that you've already retrieved from an underlying database?

This class does exactly that... it supports a minimal set of SQL SELECT command statements against a group of ADO.Net DataTables contained in a detached DataSet. The purpose is to prevent a round trip to the server to accomplish simple things like what is available with the JOIN and GROUP BY clauses of the SELECT command.

The syntax for the SELECT command is designed around the SQL Server 2000 dialect of the SQL language.

What's supported is SQL statements like the following:

SELECT Categories.CategoryID, CategoryName, AVG(UnitsInStock) AS AvgUnits
FROM Products JOIN Categories ON Categories.CategoryID = Products.CategoryID
WHERE (UnitsInStock > 0) AND (Discontinued = 0)
GROUP BY Categories.CategoryID, CategoryName
HAVING (AVG(UnitsInStock) > 30)
ORDER BY AvgUnits DESC
 
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Other User Comments

9/9/2005 7:09:49 PMCodeFester

Emmet- I have admired your contributions ever since the Son of Snoop submission. This has alot of work into it obviously. Thanks for sharing. It will take me a little time to digest but it ran so I give you a 5r; thanks again.
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9/10/2005 7:33:21 AMViola Markert

You cannot emphasis enough the possibility to establish a relational query between tables in different databases with a common sql statement.
This alone is simply WOW! I gave you five. Great work.
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9/22/2005 10:12:05 PMenmity

hey, crazy! how about full CRUD?
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9/1/2006 6:12:39 AMAbhishek Dutta

wow.. this is just too good..

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