Schema Element for EventClass (ADF)

Contains elements that define event class fields.

语法

<EventClasses>
    <EventClass>
        ...
        <Schema>

Element Characteristics

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	Required once per EventClass element.
Updates	Cannot be added or deleted when updating the application.

Element Relationships

Relationship	Elements
Parent element	EventClass Element (ADF)
Child elements	Field Element for EventClass/Schema (ADF)

备注

An event class schema defines an event class table in the application database. Notification Services automatically adds ID columns to this definition when creating the database table.

示例

The following example shows a Schema element that creates two event fields: a 10-character stock symbol field, and a stock price field that accepts monetary data.

<Schema>
    <Field>
        <FieldName>StockSymbol</FieldName>
        <FieldType>char(10)</FieldType>
        <FieldTypeMods>NOT NULL</FieldTypeMods>
    </Field>
    <Field>
        <FieldName>StockPrice</FieldName>
        <FieldType>money</FieldType>
        <FieldTypeMods>NOT NULL DEFAULT 10</FieldTypeMods>
    </Field>
</Schema>

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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