ADO.Net Architecture

ADO.Net is a data accessing technology of the Microsoft .net framework. It communicates with DBMS and RDBMS both through a common set of components. It acts as a bridge between front-end control and back-end database. Objects of ado.net are responsible for all data-related operations. ADO.Net perform its functions in both Connected and Disconnected environments.

According to Microsoft, ADO.NET is a set of classes that expose data access services for .NET Framework programmers. ADO.NET provides a rich set of components for creating distributed, data-sharing applications. It is an integral part of the .NET Framework, providing access to relational, XML, and application data. ADO.NET supports a variety of development needs, including the creation of front-end database clients and middle-tier business objects used by applications, tools, languages, or Internet browsers.

ADO.Net Components

There are 2 main components of ADO.Net:

• Data Providers
• DataSet

System.Data namespace contain all the classes of ado.net.

 

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Data Provider

Data Provider provides functionality to connect with databases. Data providers are used to performing operations on databases. Ado.net mainly work with 3 data providers in the .Net framework: Microsoft SQL Server data provider that uses sSqlConnection, an OLEDB data provider that uses OleDbConnection, an ODBC data provider that uses OdbcConnection.

A Data Provider contains objects of Connection, Command, DataAdapter and DataReader to perform the functionalities of the data provider.

• Connection: The object of Connection is used to establish a physical connection with the database. Connection String is used to providing necessary information for establishment of proper connection with the database.

Example:

sqlConnection con= new sqlConnection();

con.ConnectionString= “DataSource=msa-technosoft-pc; initial catalogue= msa-technosoft-db; user id= user1; password= pass1”;

con.Open();

• Command: The object of Command is used to execute SQL operations on databases. Command object provides several execute methods to perform SQL operations in different ways.

Example:

sqlCommand cmd= new sqlCommand(“insert into msa-tech-blog values(@slno, @title, @details)” ,con);

cmd.Parameters.AddWithValue(“@slno” , int.Parse(txtSlNo.Text));

cmd.Parameters.AddWithValue(“@title” , txtTitle.Text);

cmd.Parameters.AddWithValue(“@details” , txtDetails.Text);

cmd.ExecuteNonQuery();

con.Close();

• DataReader: This is an alternative of DataSet and DataAdapter. It is used in the connected environment. The object of DataReader allows direct access to the data records of databases.
• DataAdapter: It acts as a mediator between the database and DataSet object. It helps the DataSet to copy data from different data providers. It is useful in the disconnected environment.

 

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DataSet

The dataset is a subset of the database. It provides different mechanisms for data management in the disconnected environment. It is completely independent of the original data source. It is a copy of data source, but not having a physical connection with it. Reconnection is required to update the original database. It contains DataRelation, DataTable collection. The DataTable Collection is a collection of DataTable, DataRow, DataColumn, attribute and data.

 

• DataRelation: It is used to create a relation between two tables.
• DataTable: this class is used to represent the tables of the data source.
• DataRow: This object is used to represent a row of a table in Data Source.
• DataColumn: This is used to represent the column of a table in the data source.

 

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