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Trigger-Assigned Primary Key
from the Database Sequence
- If the primary key is assigned by a database sequence, its value is available at the posting of the entity, not the referencing one.
- During the transaction, a unique, temporary negative value is used until posting, and then refreshed with the database sequence value.
- All referencing entities are created pointing to the temporary value and need to be refreshed to prevent orphans.
- For composed entity objects, the child foreign keys are automatically refreshed when the parent is posted with the database sequence value.
Trigger-Assigned Primary Key from the Database Sequence
create or replace
TRIGGER ASSIGN_SUPPLIER_ID BEFORE INSERT ON SUPPLIERS
FOR EACH ROW
IF :NEW.SUPPLIER_ID IS NULL OR :NEW.SUPPLIER_ID < 0 THEN