FieldTypeMods Element for SubscriptionClass/Schema/Field (ADF)
Specifies optional Microsoft SQL Server field attributes for a subscription field, such as null and default values.
语法
<SubscriptionClasses>
<SubscriptionClass>
...
<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. |
备注
The value for FieldTypeMods can be any option specified when defining a column for a database table, such as NOT NULL or DEFAULTconstant_expression. For more information about possible values, see CREATE TABLE (Transact-SQL).
If you update a FieldTypeMods element, updating the application re-creates the subscription class to which it corresponds. Notification Services renames the existing tables for the subscription class by appending Old to the table names. Existing subscription table indexes are left unchanged. If you want to transfer data between the old and new subscription tables, it must be done manually. For more information, see 更新应用程序.
示例
The following example shows how to specify that the subscription class field has a default value of 10.
<FieldTypeMods>DEFAULT 10</FieldTypeMods>
请参阅
参考
Application Definition File Reference