EventClasses Element (ADF)

Contains elements that define one or more event classes used by this application.

语法

<Application>
    ...
    <EventClasses>

Element Characteristics

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	Optional once per Application element.
Updates	Can be added and deleted when updating the application.

Element Relationships

Relationship	Elements
Parent element	Application Element (ADF)
Child elements	EventClass Element (ADF)

备注

An application is not required to have event classes. The Transact-SQL queries that generate notifications can obtain data from other sources.

重要提示：
If you delete the EventClasses group of elements, updating the application deletes the event classes, including all related SQL Server tables and indexes. Any data existing in the original event class tables is permanently deleted.

示例

The following example shows an EventClasses element that has placeholders for two event classes. For an example of an event class, see EventClass Element (ADF).

<EventClasses>
    <EventClass>
    <!-- Define first event class here -->
    </EventClass>
    <EventClass>
    <!-- Define second event class here -->
    </EventClass>
</EventClasses>

请参阅

参考

Application Definition File Reference

其他资源

定义核心事件类属性
更新实例和应用程序

帮助和信息

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