April 2003
Beginner to intermediate
620 pages
21h 48m
English
Content preview from ADO.NET in a Nutshell
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Connected and Disconnected Data
As mentioned earlier, ADO.NET supports two different programming environments: connected and disconnected.
The connected environment provides
forward-only, read-only access to data in the data source and the
ability to execute commands against the data source. The connected
classes provide a common way to work with connected data regardless
of the underlying data source. They include
Connection, Command,
DataReader, Transaction,
ParameterCollection, and
Parameter classes.
The disconnected environment allows data
retrieved from the data source to be manipulated and later reconciled
with the data source. The disconnected classes provide a common way
to work with disconnected data regardless of the underlying data
source. They include the DataSet,
DataTable, DataColumn,
DataRow, Constraint,
DataRelationship, and DataView
classes.
Finally, ADO.NET introduces the connected
DataAdapter class to bridge the data source and
disconnected classes by way of the connected classes. The
DataAdapter is an abstraction of the connected
classes that simplifies filling the disconnected
DataSet or DataTable classes
with data from the data source and updating the data source to
reflect any changes made to the disconnected data. Figure 1-1 shows the relationship between the connected
and disconnected classes in ADO.NET.
 |
Figure 1-1. The connected and disconnected ADO.NET classes ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.