Question

我试图在一个sql文件中创建多个触发器。代码如下：

CREATE OR REPLACE TRIGGER trigger_selling_price_change
AFTER INSERT OR UPDATE ON SellingPrice
FOR EACH ROW
BEGIN
    dbms_output.put_line('price of phone updated');
    INSERT INTO LogSellingPriceChange
    VALUES(sysdate, phone_id, :old.price, :new.price);
END;
/


CREATE OR REPLACE TRIGGER trigger_purchase_cost_change
AFTER INSERT OR UPDATE ON PurchaseCost
FOR EACH ROW
BEGIN
    dbms_output.put_line('purchase cost updated');
    INSERT INTO LogPurchaseCostChange
    VALUES(sysdate, phone_id, :old.cost, :new.cost);
END;
/

CREATE OR REPLACE TRIGGER trigger_inventory_addition
AFTER INSERT ON Inventory
FOR EACH ROW
BEGIN
    dbms_output.put_line('enlisted new phones in database');
    INSERT INTO LogInventoryAddition
    VALUES(sysdate, phone_id, :old.quantity, :new.quantity);
END;
/

但是当我在pl / sql中执行它时，我得到Warning: Trigger created with compilation errors.的三倍。

执行show_errors后，我得到以下输出：

Errors for TRIGGER TRIGGER_INVENTORY_ADDITION:

LINE/COL ERROR
-------- -----------------------------------------------------------------
3/2      PL/SQL: SQL Statement ignored
4/18     PL/SQL: ORA-00984: column not allowed here

查询中包含的表的声明如下：

CREATE TABLE Inventory(
    id number,
    phone_id number,
    quantity number,
    PRIMARY KEY (id),
    FOREIGN KEY (phone_id) REFERENCES Phone(id)
);

CREATE TABLE PurchaseCost(
    id number,
    phone_id number,
    cost number,
    PRIMARY KEY(id),
    FOREIGN KEY (phone_id) REFERENCES Phone(id)
);

CREATE TABLE SellingPrice(
    id number,
    phone_id number,
    price number,
    PRIMARY KEY(id),
    FOREIGN KEY (phone_id) REFERENCES Phone(id)
);

CREATE TABLE LogSellingPriceChange(
    change_date date,
    phone_id number,
    old_price number,
    new_price number,
    FOREIGN KEY(phone_id) REFERENCES Phone(id)
);

CREATE TABLE LogPurchaseCostChange(
    change_date date,
    phone_id number,
    old_price number,
    new_price number,
    FOREIGN KEY(phone_id) REFERENCES Phone(id)
);

CREATE TABLE LogInventoryAddition(
    addition_date date,
    phone_id number,
    old_quantity number,
    new_quantity number,
    FOREIGN KEY(phone_id) REFERENCES Phone(id)
);

成功创建表后，我执行了用于创建触发器的文件。但是，我没有插入任何值。

Answer 1

“不允许列”错误，因为您正尝试在没有伪密钥phone_id或:new的情况下直接访问:old列，

CREATE OR REPLACE TRIGGER trigger_selling_price_change
AFTER INSERT OR UPDATE ON SellingPrice
FOR EACH ROW
BEGIN
    dbms_output.put_line('price of phone updated');
    INSERT INTO LogSellingPriceChange
    VALUES(sysdate, :new.phone_id, :old.price, :new.price);
END;
/

您还需要更改其他触发器。

遇到“警告：触发器因编译错误而创建”。同时创建多个触发器

1 个答案: