September 2003
Intermediate to advanced
624 pages
14h 27m
English
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2.8. Mapping .NET Data Provider Data Types to .NET Framework Data Types
Problem
You want to convert between .NET provider data types and .NET Framework data types.
Solution
You need to understand the .NET Framework data types; their mappings
to SQL Server, OLE DB, ODBC, and Oracle data types; and how to
properly cast them. The .NET Framework typed accessors and .NET
Framework provider-specific typed accessors for use with the
DataReader class are also important.
Discussion
The ADO.NET DataSet and contained objects are data
source independent. The DataAdapter is used to
retrieve data into the DataSet and to reconcile
modifications made to the data to the data source at some later time.
The implication is that data in the DataTable
objects contained in the DataSet are .NET
Framework data types rather than data types specific to the
underlying data source or the .NET data provider used to connect to
that data source.
While the DataReader object for a data source is
specific to the .NET data provider used to retrieve the data, the
values in the DataReader are stored in variables
with .NET Framework data types.
The .NET Framework data type is inferred from the .NET data provider
used to fill the DataSet or build the
DataReader. The DataReader has typed accessor methods that improve performance by returning a value as a specific .NET Framework data type when the data type is known, thereby eliminating the need for additional type conversion. For more information about using typed accessors ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.