FieldTypeMods Element for EventClass/Schema/Field (ADF)
Specifies optional Microsoft SQL Server field attributes for an event field, such as null and default values.
Syntax
<EventClasses>
<EventClass>
...
<Schema>
<Field>
...
<FieldTypeMods>
Element Characteristics
| Characteristic | Description |
|---|---|
Data type |
string, between 1 and 255 characters in length. |
Default value |
None. |
Occurrence |
Optional once per Field element. |
Updates |
Can be added, deleted, and modified when updating the application. |
Element Relationships
| Relationship | Elements |
|---|---|
Parent element |
|
Child elements |
None. |
Remarks
The possible values for FieldTypeMods come from the table column modifiers, such as NOT NULL or DEFAULTconstant_expression. The value must conform to the Transact-SQL syntax conventions.
Note
You cannot specify an event data field as an Identity column in SQL Server. Notification Services already uses the Identity property to specify a system-generated EventId field.
For more information about possible values, see CREATE TABLE (Transact-SQL).
Important
If you update a FieldTypeMods element, updating the application deletes and re-creates the event class to which it corresponds. 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.
Example
The following example shows how to specify that the event class field does not accept a null value.
<FieldTypeMods>NOT NULL</FieldTypeMods>
See Also
Reference
Application Definition File Reference
Other Resources
Defining Core Event Class Properties
Updating Instances and Applications