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.

Exception Condition
ArgumentNullException

The sqlCmd parameter is null.

HttpException

The SqlCommand instance has its NotificationAutoEnlist property set to true and there is an 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.

.NET Framework
Available since 2.0
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