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SqlCacheDependency Constructor (SqlCommand)

Initializes a new instance of the SqlCacheDependency class, using the supplied SqlCommand to create a cache-key dependency.

Namespace:  System.Web.Caching
Assembly:  System.Web (in System.Web.dll)

public:
SqlCacheDependency(
	SqlCommand^ sqlCmd
)

Parameters

sqlCmd
Type: System.Data.SqlClient::SqlCommand

A SqlCommand that is used to create a SqlCacheDependency object.

ExceptionCondition
ArgumentNullException

The sqlCmd parameter is nullptr.

HttpException

The SqlCommand instance has its NotificationAutoEnlist property set to true and there is an @ OutputCache directive on the page with the SqlDependency attribute set to CommandNotification.

This constructor is used to create SqlCacheDependency objects that use the query-notification feature of SQL Server 2005 products.

SQL statements that are associated with the sqlCmd parameter must include the following:

  • Fully qualified table names, including the name of the table owner. For example, to refer to a table named Customersthat is owned by the database owner, the SQL statement must refer to dbo.customers.

  • Explicit column names in the Select statement. You cannot use the asterisk (*) wildcard character to select all columns from a table. For example, instead of select * from dbo.customers, you must use select name, address, city, state from dbo.customers.

This constructor cannot be used to associate a SqlCommand instance with a SqlCacheDependency instance on a page using SQL Server 2005 query notifications with page-level output caching.

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

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0
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