Chronicles Element for EventClass (ADF)

Provides a location for defining one or more Transact-SQL statements that determine the table structure for the chronicle tables used by the event class.

语法

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

Element Characteristics

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

Element Relationships

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

备注

Event chronicles are optional; use the Chronicles element and its child elements only if you need to maintain event information outside of the event tables used by event classes. For more information, see 为事件类定义历史记录.

重要提示：
If you add or delete the Chronicles element, updating the application deletes and re-creates the event class to which it corresponds. This includes dropping and re-creating the SQL Server tables and indexes used by this event class. Any data in the existing event tables is permanently deleted.

示例

The following example shows a Chronicles element (and its child elements) that deletes any existing table named StockEventChron and then creates the StockEventChron event chronicle table. This table consists of the StockSymbol and StockPrice fields.

<Chronicles>
    <Chronicle>
        <ChronicleName>StockEventChron</ChronicleName>
        <SqlSchema>
            <SqlStatement>
            -- Delete any existing table named StockEventChron
            IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
            WHERE TABLE_NAME = &apos;StockEventChron&apos;)
            DROP TABLE StockEventChron
            </SqlStatement>
            <SqlStatement>
            -- Create the chronicle table
            CREATE TABLE StockEventChron
            (
            StockSymbol char(10),
            StockHighPrice money
            PRIMARY KEY (StockSymbol)
            )
            </SqlStatement>
        </SqlSchema>
    </Chronicle>
</Chronicles>

请参阅

参考

Application Definition File Reference

其他资源

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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