Chronicle Element for EventClass/Chronicles (ADF)

Provides a location for specifying information about one event chronicle table.

语法

<EventClasses>
    <EventClass>
        ...
        <Chronicles>
            <Chronicle>

Element Characteristics

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	Required once or more within a Chronicles element.
Updates	Can be added and deleted when updating the application.

Element Relationships

Relationship	Elements
Parent element	Chronicles Element for EventClass (ADF)
Child elements	ChronicleName Element for EventClass/Chronicles/Chronicle (ADF) SqlSchema Element for EventClass/Chronicles/Chronicle (ADF)

备注

Event chronicles are optional; use the Chronicle element and its child elements only if you need to maintain event information outside of the event tables used by an event class. A common reason to use event chronicles is to store and maintain event data for scheduled subscriptions. For more information, see 为事件类定义历史记录.

重要提示：
If you delete a Chronicle element, updating the application deletes and re-creates the event class to which the chronicle corresponds. This includes dropping and re-creating the Microsoft SQL Server tables and indexes used by the event class.

示例

The following example shows a Chronicle node that deletes any existing table named StockEventChon and then creates the StockEventChron event chronicle table.

<Chronicle>
    <ChronicleName>StockEventChron</ChronicleName>
    <SqlSchema>
        <SqlStatement>
        IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
            WHERE TABLE_NAME = &apos;StockEventChron&apos;)
        DROP TABLE StockEventChron
        </SqlStatement>
        <SqlStatement>
        CREATE TABLE StockEventChron
        (
        StockSymbol char(10),
        StockHighPrice money
        PRIMARY KEY (StockSymbol)
        )
        </SqlStatement>
    </SqlSchema>
</Chronicle>

请参阅

参考

Application Definition File Reference

其他资源

定义事件历史记录表
为事件类定义历史记录
更新实例和应用程序

帮助和信息

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