EventClass Element (ADF)

更新日期： 2005 年 12 月 5 日

Contains elements that define a single event class.

语法

<EventClasses>
    <EventClass>

Element Characteristics

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	1 to 64 occurrences per EventClasses element.
Updates	Can be added, deleted, and modified when updating the application.

Element Relationships

Relationship	Elements
Parent element	EventClasses Element (ADF)
Child elements	EventClassName Element for EventClass (ADF) Schema Element for EventClass (ADF) FileGroup Element for EventClass (ADF) IndexSqlSchema Element for EventClass (ADF) ChronicleRule Element (ADF) Chronicles Element for EventClass (ADF)

备注

重要提示：
If you delete an EventClass, updating the application deletes the event class to which it corresponds, 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 EventClass element and its child elements. It defines an event class that provides stock information to a notification application.

<EventClass>
    <EventClassName>StockEvents</EventClassName>
    <Schema>
        <Field>
            <FieldName>StockSymbol</FieldName>
            <FieldType>char(10)</FieldType>
            <FieldTypeMods>not null</FieldTypeMods>
        </Field>
        <Field>
            <FieldName>StockPrice</FieldName>
            <FieldType>money</FieldType>
            <FieldTypeMods>not null</FieldTypeMods>
        </Field>
    </Schema>
    <FileGroup>Primary</FileGroup>
    <IndexSqlSchema>
        <SqlStatement>
        CREATE CLUSTERED INDEX StockIndex
        ON StockEvents (StockSymbol)
        </SqlStatement>
    </IndexSqlSchema>
    <ChronicleRule>
        <RuleName>StockEventChronRule</RuleName>
        <Action>
        INSERT StockEventChron
        (StockSymbol, StockHighPrice)
        SELECT StockEvents.StockSymbol, StockEvents.StockPrice
        FROM StockEvents
        WHERE StockEvents.StockSymbol
        NOT IN (SELECT StockSymbol FROM StockEventChron)
        UPDATE StockEventChron
        SET StockEventChron.StockHighPrice = StockEvents.StockPrice
        FROM StockEvents JOIN StockEventChron
        ON StockEvents.StockSymbol = StockEventChron.StockSymbol 
        WHERE StockEvents.StockPrice &gt; 
            StockEventChron.StockHighPrice
        </Action>
        <ActionTimeout>P0DT00H05M00S</ActionTimeout>
    </ChronicleRule>
    <Chronicles>
        <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>
    </Chronicles>
</EventClass>

Change History

Release	History
2005 年 12 月 5 日	Changed content: Updated Occurrence description with limit of 1 to 64 event classes.

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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