EventClass Element (ADF)

Data aggiornamento: 5 dicembre 2005

Contains elements that define a single event class.

Sintassi

<EventClasses>
    <EventClass>

Element Characteristics

Element Relationships

Osservazioni

Importante:
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.

Esempio

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

Vedere anche

Riferimento

Application Definition File Reference

Altre risorse

Definizione delle proprietà di una classe di evento principale
Aggiornamento di istanze e applicazioni

Guida in linea e informazioni

Assistenza su SQL Server 2005