SqlStatement Element for EventClass/Chronicles/Chronicle/SqlSchema (ADF)
Contains a Transact-SQL statement for an event chronicle table.
语法
<EventClasses>
<EventClass>
...
<Chronicles>
<Chronicle>
...
<SqlSchema>
<SqlStatement>
Element Characteristics
| Characteristic | Description |
|---|---|
Data type |
string, between 0 and 100,000 characters in length. |
Default value |
None. |
Occurrence |
Optional once or more per SqlSchema element. |
Updates |
Can be added, deleted, and modified when updating the application. |
Element Relationships
| Relationship | Elements |
|---|---|
Parent element |
|
Child elements |
None. |
备注
Use Transact-SQL statements to create the event chronicle table used to store supplemental event data.
When using a chronicle you should include one SqlStatement element that drops or renames the chronicle table if it already exists and one SqlStatement element that re-creates the chronicle table. If you do not drop or rename an existing chronicle table, you will receive an "object exists" error when you update the application. For an example, see SqlSchema Element for EventClass/Chronicles/Chronicle (ADF).
You may also want to have SqlStatement elements for indexes.
示例
The following example shows a SqlStatement element that drops the event chronicle table StockEventChron if it exists.
<SqlStatement>
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'StockEventsChron'
AND TABLE_SCHEMA = 'dbo')
DROP TABLE dbo.StockEventsChron;
</SqlStatement>
请参阅
参考
Application Definition File Reference