Question

插入此代码后，我收到错误消息

ORA-04091：table（schema）.EMPLOYEES正在变异，触发器/函数可能看不到它

ORA-06512：at＆＃34; HR.TRGADDEMP_1215034＆＃34;，第7行

ORA-04088：执行触发器时出错＆＃39; HR.TRGADDEMP_1215034＆＃39;

我该怎么办？

CREATE OR REPLACE TRIGGER TrgAddEmp_1215034
        AFTER INSERT ON Employees
        FOR EACH ROW

        DECLARE
        v_name varchar2(35);
        v_managerName varchar2(20);
        v_dept varchar2(35);

        BEGIN
        Select first_name||' '||last_name
        INTO v_name
        FROM Employees where employee_id = :new.employee_id;

        Select last_name 
        into v_managerName
        from employees where employee_id = :new.manager_id;

        Select department_name
        into v_dept
        from departments where department_id = :new.department_id;

        IF v_managerName is NULL THEN
        DBMS_OUTPUT.PUT_LINE('There is a new employee '|| v_name );
        DBMS_OUTPUT.PUT_LINE('The supervisor for this employee has not been decided');
        DBMS_OUTPUT.PUT_LINE('This employee is assigned to '||v_dept|| 'Department');
        ELSIF v_dept is NULL THEN
        DBMS_OUTPUT.PUT_LINE('There is a new employee '|| v_name );
        DBMS_OUTPUT.PUT_LINE('This employee is supervised by ' || v_managerName);
        DBMS_OUTPUT.PUT_LINE('The department for this employee has not been decided');
        ELSE
        DBMS_OUTPUT.PUT_LINE('There is a new employee '|| v_name );
        DBMS_OUTPUT.PUT_LINE('This employee is supervised by ' || v_managerName);
        DBMS_OUTPUT.PUT_LINE('This employee is assigned to '||v_dept|| 'Department');
        END IF;
        END;

Answer 1

您应该插入正确的代码而不是：）

ORA-4091表示您的触发器尝试从其自己的表中选择数据。只是不要这样做。决不。行级触发器不允许这样做。

此代码尝试选择您已有的数据。

为什么你要选择first_name＆amp; last_name和:new.first_name后:new.last_name？等等...

表正在变异

1 个答案: