插入此代码后，我收到错误消息
ORA-04091：表（模式）.EMPLOYEES正在变异，触发器/函数可能看不到它
ORA-06512：第7行“HR.TRGADDEMP_1215034”
ORA-04088：执行触发器'HR.TRGADDEMP_1215034'时出错
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;
1 回答
你应该插入一个正确的代码而不是这个:)
ORA-4091表示您的触发器尝试从中选择数据's own table. Just don' t . 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 .
当你有
:new.first_name和:new.last_name时，为什么要尝试选择first_name＆last_name？等等...