Field Element for EventClass/Schema (ADF)

Provides a location for defining one event class field.

语法

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

Characteristic	Description
Data type	None.
Default value	None.
Occurrence	Required once or more per Schema element.
Updates	Can be added and deleted when updating the application.

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

Parent element

Schema Element for EventClass (ADF)

Child elements

FieldName Element for EventClass/Schema/Field (ADF)

The Field element contains the field name, field type, and field type modifiers used when creating the event class table in the database.

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

The following example shows the definition of a StockSymbol event field.

<Field>
    <FieldName>StockSymbol</FieldName>
    <FieldType>char(10)</FieldType>
    <FieldTypeMods>NOT NULL</FieldTypeMods>
</Field>