Represents an SQL statement that is executed while connected to a data source, and is implemented by .NET Framework data providers that access relational databases.
Assembly: System.Data (in System.Data.dll)
The interface enables an inheriting class to implement a Command class, which represents an SQL statement that is executed at a data source. For more information about Command classes, see Executing a Command (ADO.NET).
An application does not create an instance of the interface directly, but creates an instance of a class that inherits .
Classes that inherit must implement all inherited members, and typically define additional members to add provider-specific functionality. For example, the interface defines the ExecuteNonQuery method. In turn, the SqlCommand class inherits this method, and also defines the ExecuteXmlReader method.Notes to Implementers:
To promote consistency among .NET Framework data providers, name the inheriting class in the form PrvClassname where Prv is the uniform prefix given to all classes in a specific .NET Framework data provider namespace. For example, Sql is the prefix of the SqlCommand class in the System.Data.SqlClient namespace.
When you inherit from the interface, you should implement the following constructors:
Initializes a new instance of the PrvCommand class.
Initializes a new instance of the PrvCommand class with the text of the query.
PrvCommand(string cmdText, PrvConnection connection)
Initializes a new instance of the PrvCommand class with the text of the query and a PrvConnection.
PrvCommand(string cmdText, PrvConnection connection, PrvTransaction transaction)
Initializes a new instance of the PrvCommand class with the text of the query, a PrvConnection, and the PrvTransaction.
The following example creates instances of the derived classes, SqlConnection, SqlCommand, and SqlDataReader. The example reads through the data, writing it to the console. Finally, the example closes the SqlDataReader, then the SqlConnection.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.