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

The ADO.NET structure consists of two core components: DataSet and the .NET Framework data provider DataSet are the core components of the disconnected structure of ADO.NET. In order to achieve data access independent of any data source, it can be regarded as an in-memory cache of data retrieved from the database. It consists of a collection of one or more DataTable objects consisting of data rows, data columns and primary keys, foreign keys, constraints, and relational information about the data in the DataTable object.

.net Framework data provider for data manipulation and data access. The core elements it provides are Connection,Command, DataReader,DataAdapter objects. Among them, the Connection object provides the connection to the database; the Command object can access database commands for returning data, modifying data, running stored procedures, and sending or retrieving parameter information; and the DataReader object provides high-performance data flow from the data source. The DataAdapter object provides a bridge between the DataSet object and the data source, using the Command object to execute SQL commands in the data source to load the data into DataSet and to make changes to the data in DataSet consistent with the data source. ADO.NET structure data access process flow chart:

One way is to connect directly to the database, even if you use Command objects to access the database. The way to do this is to read the data through the DataReader object and then display the data using Response.Write. The advantage of this approach is that it does not take up extra memory, but reads data faster, but requires a long amount of program code.

Another way is to cache the data in DataSet, even if you use DataAdapter objects to access the database. In this way, the data is displayed directly by using the DataSet object with the interface provided by the DataGrid object. The advantage of this approach is that it requires less code, but takes up extra memory, and the speed of reading data is slower than the previous method.

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