SqlCacheDependency.SqlCacheDependency(SqlCommand) Constructor

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
)
public SqlCacheDependency (
	SqlCommand sqlCmd
)
public function SqlCacheDependency (
	sqlCmd : SqlCommand
)
Not applicable.

Parameters

sqlCmd

A SqlCommand that is used to create a SqlCacheDependency object.

Exception typeCondition

ArgumentNullException

The sqlCmd parameter is a null reference (Nothing in Visual Basic).

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 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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