Oracle中創建觸發器

Question

在Oracle數據庫：我嘗試以下查詢：

CREATE or REPLACE TRIGGER myTrigger 
AFTER UPDATE OR INSERT ON product 
REFERENCING NEW AS NEW 
FOR EACH ROW 
BEGIN 

    INSERT INTO h_product 
    (
     H_PRODUCT_ID, 
     PRODUCT_ID  
    ) 
    VALUES 
    (
     seq_h_product.nextval, 
     :new.product_id 
    ); 

END 

當我執行，我得到這個錯誤：

3:56:45 [UPDATE - 0 row(s), 0.000 secs] [Error Code: 4098, SQL State: 42000] ORA-04098: Déclencheur 'NEILA.myTrigger' non valide. Echec de la revalidation 

我執行：

select object_name 
from dba_objects 
where object_type = 'TRIGGER' 
and status = 'INVALID'; 

=>我在列表中獲得myTrigger！ 爲什麼它無效？

Answer 1

請根據你已經錯過:new.product_id

CREATE or REPLACE TRIGGER myTrigger 
AFTER UPDATE OR INSERT ON product 
REFERENCING NEW AS NEW 
FOR EACH ROW 
BEGIN 

    INSERT INTO h_product 
    (
     H_PRODUCT_ID, 
     PRODUCT_ID  
    ) 
    VALUES 
    (
     seq_h_product.nextval, 
     :new.product_id 
    ); 

END; 
/