嵌套表上的Oracle触发器 [英] Oracle Trigger on Nested Table

问题描述

我想创建一个触发器来验证出生日期，例如不是> SYSDATE:

I want to create a trigger to validate the date of birth, for example it's not > SYSDATE:

Employee -- STRUCTURED TYPE
{
     name VARCHAR2(10)
     lastname VARCHAR(10)
     birthdate DATE
}

Employee_List TABLE OF Employee -- NESTED TABLE

Museum -- TABLE
{
     id NUMBER
     EmployeeList Employee_List
}

我正在使用Oracle 10g.

I'm using Oracle 10g.

推荐答案

您无法定义"Museum.EmployeeList.birthdate更新之前"之类的触发器. 但是您可以在Museum更新之前编写一个普通的触发器，并且可以在触发器主体中循环查看日期的所有员工.

You cannot define a trigger like "BEFORE UPDATE ON Museum.EmployeeList.birthdate" But you can write a normal trigger BEFORE UPDATE ON Museum and in trigger body you can loop over all employees checking the date.

尝试一下:

CREATE OR REPLACE TRIGGER BUIR_Museum 
    BEFORE INSERT OR UPDATE ON Museum
    FOR EACH ROW

BEGIN
    IF :NEW.EmployeeList IS NOT NULL THEN
        FOR i IN :NEW.EmployeeList.FIRST..:NEW.EmployeeList.LAST LOOP
            IF :NEW.EmployeeList(i).birthdate > SYSDATE THEN
                RAISE_APPLICATION_ERROR(-20029, 'Invalid birthday');
            END IF;
        END LOOP;
    END IF;
END;

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