LinkLeafCondition.LinkChain Property

Artikkeli
12/03/2008

Gets an ordered collection of JoinClause instances describing the link between the table or view this condition references and the InputType of the Filter element.

Namespace: Microsoft.SqlServer.NotificationServices.Rules
Assembly: Microsoft.SqlServer.NotificationServices.Rules (in microsoft.sqlserver.notificationservices.rules.dll)

Syntax

'Declaration
Public ReadOnly Property LinkChain As Collection(Of JoinClause)

public Collection<JoinClause> LinkChain { get; }

public:
property Collection<JoinClause^>^ LinkChain {
    Collection<JoinClause^>^ get ();
}

/** @property */
public Collection<JoinClause> get_LinkChain ()

public function get LinkChain () : Collection<JoinClause>

Property Value

A Collection of JoinClause objects.

Remarks

If this chain is empty, the Filter must have the same InputType table or view as this condition.

Links in the chain must follow these rules:

The first JoinClause in the chain must have a SourceColumn value that belongs to the InputType table or view of this condition.
Subsequent JoinClause objects must have SourceColumn columns in the same table or view as the TargetColumn of the previous element.
The final link in the chain must have a TargetColumn in the same table or view as the InputType of the Filter.

Example

The following example shows the link chain defined for a subscription. The link chain links the event view to the inventory table, which is linked to the location table:

// Subscribe to products in Subassembly location. This
// requires select permissions on all tables in the sample.

//Specify server and database.
Server server = new Server("MyServer");
Database db = server.Databases[nsApplication.DatabaseName];

// Specify tables and views used by the condition.
Table locationTable = db.Tables["Location", "Production"];
Table inventoryTable = db.Tables["ProductInventory", "Production"];
View eventView = db.Views["InventoryTrackerEvents",
    "NS_InventoryTrackerApplication"];

// Filter defining "Subassembly" locations.
FilterRule toolCrib = new FilterRule(
    new TableInputType(db.Tables["Location", "Production"]),
    new SimpleLeafCondition(new FieldValue("Name"),
        SimpleOperator.Equals, "Subassembly"));

// Create subscription and define basic properties.
s = new Subscription(nsApplication, subscriptionClassName);
s.SubscriberId = "Stephanie";
s.Enabled = true;
s.RuleName = "InventoryTrackerRule";
s.SetFieldValue("DeviceName", "myDevice");
s.SetFieldValue("SubscriberLocale", "en-us");

// Define a condition using the filter.
s.Condition = new LinkLeafCondition(
    LinkLeafOperator.Any,
    toolCrib,
    new JoinClause(eventView.Columns["ProductId"],
        inventoryTable.Columns["ProductId"]),
    new JoinClause(inventoryTable.Columns["LocationId"],
        locationTable.Columns["LocationId"]));

// Add subscription.
s.Add();

Thread Safety

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

Target Platforms