SqlExpression Element for ConditionAction (ADF)

Specifies the Transact-SQL query used to generate notifications from the input and subscription data.

Syntax

<ConditionAction>
    ...
    <SqlExpression>

Element Characteristics

Characteristic	Description
Data type	string between 1 and 100000 characters.
Default value	None.
Occurrence	Required once per ConditionAction element.
Updates	You can modify this element, but cannot add or delete it when updating the application. You can add and delete the parent ConditionAction element.

Element Relationships

Relationship	Elements
Parent element	ConditionAction Element (ADF)
Child elements	None.

Remarks

The SqlExpression element contains the core query for generating notifications, which selects subscription and input fields and adds them to the notification table.

The query must select subscription and input fields from a view that joins subscription and input data. Subscription fields in the view have names in the form [Subscription.SubscriptionFieldName]. Input (event) fields have names in the form [Input.EventFieldName].

Subscribers create the equivalent of the WHERE clause for the query in their subscriptions through a subscription management interface. Notification Services evaluates the condition actions for all relevant subscriptions and then generates notifications.

For more information about condition actions, and a template for the Transact-SQL expression, see Defining Condition Actions.

Example

The following example shows how to define a condition action. The query in the Transact-SQL expression selects data from the MyAppSchema.WeatherEventRule view, which contains data from the subscription class and from the MyAppSchema.WeatherEvents event view.

<ConditionAction>
    <SqlLogin>[MyLowPrivLogin]</SqlLogin>
    <SqlUser>[MyLowPrivUser]</SqlUser>
    <InputName>WeatherEvents</InputName>
    <InputSchema>MyAppSchema</InputSchema>
    <SqlExpression>
        INSERT INTO MyAppSchema.WeatherNotifications(SubscriberId, 
        DeviceName, SubscriberLocale, City, Forecast) 
        SELECT [Subscription.SubscriberId], [Subscription.DeviceName], 
            [Subscription.SubscriberLocale], [Input.City], 
            [Input.Forecast])
        FROM MyAppSchema.WeatherEventRule;
    </SqlExpression>
</ConditionAction>

See Also

Reference

Application Definition File Reference

Concepts

Instance Configuration File Reference

Other Resources

INSERT (Transact-SQL)
SELECT (Transact-SQL)
Defining Condition Actions
Defining Subscription Rules

Help and Information

Getting SQL Server 2005 Assistance