通過檢查字段的值創建觸發器被插入在ORALCE

Question

我需要在TABLE1 INSERT觸發器之前創建一個這樣它插入COL2和新行的COL3被插入到TABLE1僅TABLE2時TABLE1.FIELD1 = 'XYZ'。我該如何做到這一點，只有當條件滿足時觸發器纔會被觸發？

Answer 1

CREATE OR REPLACE TRIGGER my_trigger 
    before insert 
    ON table_1 
    FOR EACH ROW 
BEGIN 
    IF :NEW.FIELD1 = 'XYZ' 
    then 
    INSERT INTO table_2 (col1, col2) VALUES (:NEW.col1, :NEW.col2); 
    END IF; 
END; 
/

或如何a_horse_with_no_name注意，您可以使用該WHEN條款

CREATE OR REPLACE TRIGGER my_trigger 
    before insert 
    ON table_1 
    FOR EACH ROW 
    WHEN (NEW.FIELD1 = 'XYZ') 
BEGIN 

    INSERT INTO table_2 (col1, col2) VALUES (:NEW.col1, :NEW.col2); 

END; 
/