Question

我正在尝试创建一个触发器，以防止在办公时间以外（即8-18小时或周日除外）进行插入，更新和删除。

这是我的代码：

CREATE OR REPLACE TRIGGER HOLIDAY
BEFORE DELETE OR INSERT OR UPDATE ON DEPT FOR EACH ROW
BEGIN
IF ((EXTRACT(DAY FROM SYSDATE)='SUNDAY') OR (EXTRACT(HOUR FROM LOCALTIMESTAMP) NOT BETWEEN 8 AND 18)) THEN
   RAISE_APPLICATION_ERROR(-20001,'ILLEGAL OPERATION - OUT OF OFFICE HOURS OR HOLIDAY!');
 END IF ;
END; 
/

触发器已创建。今天是星期天，当我尝试插入一行时，应用程序错误没有提高，相反，我得到的是：

SQL> @/home/divya/A43.SQL

Trigger created.

SQL> DELETE FROM DEPT WHERE D_NO = 'D3' ;
DELETE FROM DEPT WHERE D_NO = 'D3'
            *
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
ORA-06512: at "DIVYA12345.HOLIDAY", line 2
ORA-04088: error during execution of trigger 'DIVYA12345.HOLIDAY'

有人可以告诉我究竟是什么错误？显示错误显示 - 输出没有错误。任何帮助都非常感谢。提前致谢。

Answer 1

您收到错误，因为EXTRACT(DAY FROM SYSDATE)会返回月份中的日期编号，而不是其名称。要检索名称，您可以使用TO_CHAR(SYSDATE, 'DAY')代替，或to_char(sysdate,'fmDY', 'nls_date_language = ENGLISH')，如评论中所示：

CREATE OR REPLACE TRIGGER HOLIDAY
BEFORE DELETE OR INSERT OR UPDATE ON DEPT FOR EACH ROW
BEGIN
IF (TO_CHAR(sysdate,'fmDY', 'nls_date_language = ENGLISH')='SUNDAY') OR (EXTRACT(HOUR FROM LOCALTIMESTAMP) NOT BETWEEN 8 AND 18)) THEN
   RAISE_APPLICATION_ERROR(-20001,'ILLEGAL OPERATION - OUT OF OFFICE HOURS OR HOLIDAY!');
END IF ;
END; 
/

尝试根据日期和时间创建触发器

1 个答案: