For the greatest degree of control over the update strategy, you add Update Strategy transformations to a mapping. The most important feature of this transformation is its update strategy expression, used to flag individual rows for insert, delete, update, or reject.
The following table lists the constants for each database operation and their numeric equivalent:
Operation
Constant
Numeric Value
Insert
DD_INSERT
0
Update
DD_UPDATE
1
Delete
DD_DELETE
2
Reject
DD_REJECT
3
The Integration Service treats any other value as an insert.