Question

我试图让这个触发器工作。它的作用是，在从表及其附属表中删除数据之前执行，然后将删除的数据插入2个表（我将其命名为tb1_arch和tb2_arch）。我一直在谷歌搜索可能的修复但我真的不知道如何使这项工作

CREATE OR REPLACE TRIGGER trig
BEFORE DELETE ON tb1 FOR EACH ROW
FETCH
INSERT INTO tb1_arch VALUES (:old.OrderNum, :old.tb1Date,:old.CustomerName);
DBMS_OUTPUT.PUT_LINE('Data archived.');
END;

上面创建了触发器。但是当我添加这一行

INSERT INTO tb2_arch VALUES (:old.OrderNum, :old.ItemNum, :old.Pieces);

在INSERT INTO tb1_arch VALUES之后，它给了我一个错误

＆＃34;第5行出错：PLS-00049：错误的绑定变量＆＃39; OLD.PIECES＆＃39;＆＃34;

任何帮助将不胜感激！

编辑：正如Vijayakumar先生建议的那样，我做了以下事情：

CREATE OR REPLACE TRIGGER trig
    BEFORE DELETE ON tb1 
    REFERENCING OLD AS old FOR EACH ROW
    INSERT INTO tb1_arch VALUES (:old.OrderNum, :old.tb1Date,:old.CustomerName);
    INSERT INTO tb2_arch VALUES (:old.OrderNum, :old.ItemNum, :old.Pieces);
    DBMS_OUTPUT.PUT_LINE('Data archived.');
    END

但是，我仍然遇到同样的错误。

编辑：删除了FETCH，我仍然遇到同样的问题

CREATE OR REPLACE TRIGGER trig
BEFORE DELETE ON tb1 FOR EACH ROW

INSERT INTO tb1_arch VALUES (:old.OrderNum, :old.tb1Date,:old.CustomerName);
INSERT INTO tb2_arch VALUES (:old.OrderNum, :old.ItemNum, :old.Pieces);
DBMS_OUTPUT.PUT_LINE('Data archived.');
END;

表格如下： TB1：

create table tb1 (
    OrderNum integer NOT NULL primary key,
    tb1Date date NOT NULL,
    CustomerName varchar2(50) NOT NULL,

--constraints
    CONSTRAINT tb1_uc unique (CustomerName)
);

TB2

create table tb2 (
    OrderNum integer NOT NULL,
    ItemNum integer NOT NULL,
    Pieces integer NOT NULL,

--constraints
    CONSTRAINT tb2_fk foreign key (OrderNum) references tb1(OrderNum),
);

Answer 1

关键字DELIMITER $$ CREATE TRIGGER after_insert AFTER INSERT ON SampleTable FOR EACH ROW BEGIN UPDATE SampleTable SET media = '../trigger/smile1.png' WHERE flag =0; UPDATE SampleTable SET media = '../trigger/smile2.png' WHERE flag =1; UPDATE SampleTable SET media = '../trigger/smile3.png' WHERE flag =2; END$$ DELIMITER ;应该导致此问题，将其替换为FETCH，这是正确的语法，

BEGIN

编辑：您使用CREATE OR REPLACE TRIGGER trig BEFORE DELETE ON tb1 FOR EACH ROW BEGIN INSERT INTO tb1 VALUES (:old.OrderNum, :old.Date,:old.CustomerName); INSERT INTO tb2_arch VALUES (:old.OrderNum, :old.ItemNum, :old.Pieces); DBMS_OUTPUT.PUT_LINE('Data archived.'); END;引用的列名可能无效，这就是导致此错误的原因。

触发器仅适用于 ONE 表的OLD事件。但是，您可以在正文中引用多个表格。

但INSERT/UPDATE/DELETE和OLD将始终引用您在DDL中提到的表格NEW。

以下修改后的代码可以为您提供帮助。

DELETE ON tb1

或者，您可以使用另一个触发器CREATE OR REPLACE TRIGGER trig BEFORE DELETE ON tb1 FOR EACH ROW DECLARE v_ItemNum tb2.ItemNum%TYPE; v_Pieces tb2.Pieces%TYPE; BEGIN INSERT INTO tb1_arch VALUES (:old.OrderNum, :old.Date,:old.CustomerName); /* Select the values for this item from table 2 */ SELECT ItemNum,Pieces INTO v_ItemNum,v_Pieces FROM tb2 WHERE OrderNum = :old.OrderNum; /* Insert the selected values in the table2's archive version */ INSERT INTO tb2_arch VALUES (:old.OrderNum, v_ItemNum, v_Pieces); /* Delete the entry */ DELETE from tb2 WHERE OrderNum = :old.OrderNum; DBMS_OUTPUT.PUT_LINE('Data archived.'); END;并将数据归档到那里。

PLS-00049：错误的绑定变量触发器

1 个答案: