Do a table's INSERT TRIGGER, the purpose is to modify the field of the inserted row.
Create or Replace Trigger TR_RME_SLOTBEFORE
INSERT on RME_SLOT
For Each Row
Begin
IF (: new.position> = 0 and: new.position <10) THEN
: New.slot_name: = '0' || to_Char (: new.position);
Else
: NEW.SLOT_NAME: = to_CHAR (: new.position);
END IF;
END;
You need to modify the insert line before inserting; UPDATE statements do not need to be used in Trigger implementations
At the same time, if you want to implement the modification of this table in TRIGGER, you need to write:
Create or Replace Trigger TR_RME_SLOT AFTER
INSERT on RME_SLOT
For Each Row
Declare
Pragma autonomous_transaction;
Begin
IF (: new.position> = 0 and: new.position <10) THEN
Update RME_SLOT SET SLOT_NAME = '0' || to_char (: new.position) where slot_id =: new.slot_id;
Else
Update RME_SLOT SET SLOT_NAME = to_CHAR (: new.position) where slot_id =: new.slot_id;
END IF;
COMMIT;
END;
Pay attention to a Declare, while at the end of TRIGGER, you need commiti
