ComputedFields Element (ADF)

Provides a location for all of the computed notification field definitions for one notification class.

语法

<NotificationClasses>
    <NotificationClass>
        ...
        <Schema>
            ...
            <ComputedFields>

Element Characteristics

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	Optional once per /NotificationClass/Schema node.
Updates	Can be added and deleted when updating the application.

Element Relationships

Relationship	Elements
Parent element	Schema Element for NotificationClass (ADF)
Child elements	ComputedField Element (ADF)

备注

If you add or delete the ComputedFields element, SQL Server deletes and recreates the corresponding notification class when you update the application. This includes dropping and re-creating the SQL Server tables used by this notification class.

注意：
Make sure to back up your application database before updating the application.

示例

The following example shows a populated ComputedFields node. The computed fields, MaxChange and AvgChange, show the maximum growth and the average growth of the stocks in a chronicle table.

<ComputedFields>
    <ComputedField>
        <FieldName>StockPrice</FieldName>
        <SqlExpression>CONVERT(NVARCHAR(10), StockPrice, 1)
        </SqlExpression>
    </ComputedField>
</ComputedFields>

请参阅

参考

Application Definition File Reference

其他资源

定义通知架构
更新实例和应用程序

帮助和信息

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