SubscriptionEventRule Class

Artikkeli
12/03/2008

Represents an event rule that contains simple actions, not condition actions.

Namespace: Microsoft.SqlServer.Management.Nmo
Assembly: Microsoft.SqlServer.Smo (in microsoft.sqlserver.smo.dll)

Syntax

'Declaration
Public NotInheritable Class SubscriptionEventRule
    Inherits NamedSmoObject

public sealed class SubscriptionEventRule : NamedSmoObject

public ref class SubscriptionEventRule sealed : public NamedSmoObject

public final class SubscriptionEventRule extends NamedSmoObject

public final class SubscriptionEventRule extends NamedSmoObject

Remarks

The SubscriptionEventRule class represents a rule that uses simple parameter-based Transact-SQL queries to generate notifications as event batches arrive, or that do other processing, such as maintaining chronicles.

Each SubscriptionEventRule object must specify an action, which is a Transact-SQL query that does the work of the rule. A subscription class can have multiple SubscriptionEventRule objects, and can also have SubscriptionConditionEventRule, SubscriptionScheduledRule, and SubscriptionConditionScheduledRule objects.

SubscriptionEventRule objects are associated with a subscription class through the SubscriptionEventRules property.

Inheritance Hierarchy

System.Object
   Microsoft.SqlServer.Management.Smo.SmoObjectBase
     Microsoft.SqlServer.Management.Smo.SqlSmoObject
       Microsoft.SqlServer.Management.Smo.NamedSmoObject
        Microsoft.SqlServer.Management.Nmo.SubscriptionEventRule

Example

The following examples show how to define an event rule and then add it to a subscription class:

// Add a rule to generate basic event-triggered notifications
SubscriptionEventRule flightEventRule = 
    new SubscriptionEventRule(flightSubscriptions, 
    "FlightSubscriptionsEventRule");
flightEventRule.Action = "INSERT INTO FlightNotifications " + 
    "(SubscriberId, DeviceName, SubscriberLocale, " + 
    "LeavingFrom, GoingTo, Price) " + 
    "SELECT S.SubscriberId, S.DeviceName, S.SubscriberLocale, " + 
    "E.LeavingFrom, E.GoingTo, E.Price " + 
    "FROM FlightEvents E, FlightSubscriptions S " + 
    "WHERE     E.LeavingFrom     = S.LeavingFrom " + 
    "AND    E.GoingTo    = S.GoingTo " + 
    "AND    E.Price    < S.Price";
flightEventRule.ActionTimeout = new TimeSpan(0, 1, 0);
flightEventRule.EventClassName = "FlightEvents";
flightSubscriptions.SubscriptionEventRules.Add(flightEventRule);

' Add a rule to generate basic event-triggered notifications
Dim flightEventRule As SubscriptionEventRule = _
    New SubscriptionEventRule(flightSubscriptions, _
        "FlightSubscriptionsEventRule")
flightEventRule.Action = _
    "INSERT INTO FlightNotifications " + _
    "(SubscriberId, DeviceName, SubscriberLocale, " + _
    "LeavingFrom, GoingTo, Price) " + _
    "SELECT S.SubscriberId, S.DeviceName, S.SubscriberLocale, " + _
    "E.LeavingFrom, E.GoingTo, E.Price " + _
    "FROM FlightEvents E, FlightSubscriptions S " + _
    "WHERE E.LeavingFrom = S.LeavingFrom " + _
    "AND E.GoingTo = S.GoingTo " + _
    "AND E.Price < S.Price"
flightEventRule.ActionTimeout = New TimeSpan(0, 1, 0)
flightEventRule.EventClassName = "FlightEvents"
flightSubscriptions.SubscriptionEventRules.Add(flightEventRule)

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