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This article mainly introduces "what is the ADO.NET framework". In daily operation, I believe many people have doubts about what the ADO.NET framework is. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about "what is the ADO.NET framework?" Next, please follow the editor to study!

Here is a little bit of my own experience in using ADO.NET, including the comparison between the various objects provided by the Microsoft ADO.NET framework, how to choose a better solution, and so on. All of these help optimize Microsoft ADO.NET applications. Because the author developed using the SQL Server .NET data provider under the System.Data.SqlClient namespace, this article is expanded under the above framework.

The ADO.NET Framework is the data access model for .NET applications. It can be used to access relational database systems such as SQL Server 2000, and many other data sources that are already equipped with OLE DB providers. To some extent, ADO.NET represents the * version of ADO technology. However, ADO.NET introduces some major changes and innovations that are designed for loosely structured, essentially unlinked Web applications.

An important change introduced by the ADO.NET framework is that the ADO Recordset object is replaced by a combination of DataTable, DataSet, DataAdapter, and DataReader objects. DataTable represents a collection of rows from a table, which is similar to Recordset in this respect. DataSet represents a collection of DataTable objects and the relationships and restrictions tied to other tables. In fact, DataSet is an in-memory association structure with built-in Extensible markup language (XML) support.

One of the main features of DataSet is that it knows nothing about the underlying data sources that may be used to populate them. This is a separate entity used to represent a collection of data, and it can be passed from one component to another through different layers of a multi-tier application. It can also be serialized as an XML data stream, so it is very suitable for data transfer between different types of platforms. ADO.NET uses DataAdapter objects to channel data sent to and from DataSet and underlying data sources. The DataAdapter object also supports enhanced batch update features, which were previously related to Recorder.

When to use DataSet and DataReader

ADO.NET provides two objects for retrieving relational data and storing it in memory: DataSet and DataReader. DataSet provides a relational representation of in-memory data, a complete set of data, including tables that contain data, sort data, and constrain data, as well as relationships between tables. DataReader provides a fast, forward-only, read-only data stream from a database. When designing an application, consider the level of functionality required by the application to determine whether to use DataSet or DataReader. To do the following through the application, use DataSet: navigate between multiple discrete tables of the result. Manipulate data from multiple data sources (for example, mixed data from multiple databases, an XML file, and a spreadsheet). Exchange data between tiers or use XML Web services. Unlike DataReader, DataSet can be passed to a remote client.

Reuse the same row groups to achieve performance improvements through caching (such as sorting, searching, or filtering data). Each line performs a large amount of processing. Extending each row returned using DataReader extends the time necessary to service the connection to DataReader, which affects performance. Use XML operations to manipulate data, such as extensible stylesheet language transformations (XSLT transformations) or XPath queries.

To use DataReader in your application, you do not need to cache data for the following situations. The result set to be processed is too large to fit in memory. Once you need to quickly access data in a forward-only, read-only way.

At this point, the study of "what is the ADO.NET framework" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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