Question

什么是错的......？请检查我的触发器

create or replace
TRIGGER TBL_AE_BI
BEFORE UPDATE
ON TBL_AE
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW

DECLARE
KD_AE VARCHAR2 (6);

BEGIN

  SELECT AE_ID INTO KD_AE FROM (
  SELECT KDMAX,(SELECT TO_CHAR('AE')KD FROM DUAL)||
        (CASE WHEN KDMAX>=0 AND  KDMAX<10 THEN '000'||KDMAX
              WHEN KDMAX>=10 AND  KDMAX<100 THEN '00'||KDMAX
              WHEN KDMAX>=100 AND  KDMAX<1000 THEN '0'||KDMAX
              ELSE TO_CHAR(KDMAX)
         END)AE_ID
  FROM (SELECT (NVL(MAX(TO_NUMBER(SUBSTR(AE_ID,3,4))),0)+1)KDMAX FROM TBL_AE)
  );

  :NEW.AE_ID:=KD_AE;
  :NEW.INSERT_DATE:= SYSDATE; 

END;

当我在表中插入新记录时，结果是错误，无法向AE_ID插入NULL。

但是当我使用以下代码在SQL窗口中执行时

SELECT AE_ID as KD_AE FROM (
SELECT KDMAX,(SELECT TO_CHAR('AE')KD FROM DUAL)||
  (CASE WHEN KDMAX>=0 AND  KDMAX<10 THEN '000'||KDMAX
        WHEN KDMAX>=10 AND  KDMAX<100 THEN '00'||KDMAX
        WHEN KDMAX>=100 AND  KDMAX<1000 THEN '0'||KDMAX
        ELSE TO_CHAR(KDMAX)
   END)AE_ID
FROM (SELECT (NVL(MAX(TO_NUMBER(SUBSTR(AE_ID,3,4))),0)+1)KDMAX FROM TBL_AE)
)

结果没有错误，我得到一个新的唯一ID。

喜欢

Answer 1

在更新之前更改为INSFORE

create or replace
TRIGGER TBL_AE_BI
BEFORE INSERT --Changed
ON TBL_AE
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW

DECLARE
KD_AE VARCHAR2 (6);

BEGIN

  SELECT AE_ID INTO KD_AE FROM (
  SELECT KDMAX,(SELECT TO_CHAR('AE')KD FROM DUAL)||
        (CASE WHEN KDMAX>=0 AND  KDMAX<10 THEN '000'||KDMAX
              WHEN KDMAX>=10 AND  KDMAX<100 THEN '00'||KDMAX
              WHEN KDMAX>=100 AND  KDMAX<1000 THEN '0'||KDMAX
              ELSE TO_CHAR(KDMAX)
         END)AE_ID
  FROM (SELECT (NVL(MAX(TO_NUMBER(SUBSTR(AE_ID,3,4))),0)+1)KDMAX FROM TBL_AE)
  );

  :NEW.AE_ID:=KD_AE;
  :NEW.INSERT_DATE:= SYSDATE; 

END;

插入前的PL / SQL Oracle触发器无法获得新的唯一主ID

1 个答案: