Question

我制作了一张桌子和四个序列。（列的一个序列，列的三个序列。）

CREATE TABLE abc (
  whole_number VARCHAR2(100) primary key,
  board_number VARCHAR2(100),
  board VARCHAR2(100),
  content VARCHAR2(100)
);
CREATE SEQUENCE whole_seq
  MINVALUE 1
  NOMAXVALUE
  INCREMENT BY 1 START WITH 1 
;

CREATE SEQUENCE notify_seq
  MINVALUE 1
  NOMAXVALUE
  INCREMENT BY 1 START WITH 1 
;
CREATE SEQUENCE product_seq
  MINVALUE 1
  NOMAXVALUE
  INCREMENT BY 1 START WITH 1 
;
CREATE SEQUENCE guide_seq
  MINVALUE 1
  NOMAXVALUE
  INCREMENT BY 1 START WITH 1 
;

我想创建一个在每行为whole_number列添加whole_seq的过程，如果board列获得'guide'，则为board_number列的guide_seq和guide_seq。如果board列获得'notify'，则发送给board_number列的notify_seq。

现在制作了一个full_number列的程序。

CREATE OR REPLACE TRIGGER whole_number_trigger 
  BEFORE INSERT 
  ON abc FOR EACH ROW
  BEGIN
  SELECT whole_seq INTO :new.whole_number FROM dual;
END;  
/

有人可以根据ORACLE中的Board列值来帮助我创建一个不同序列的过程吗？另外，有没有办法在full_number列的序列号之前添加字符串'Board_'？

Answer 1

CREATE OR REPLACE TRIGGER whole_number_trigger 
  BEFORE INSERT 
  ON abc FOR EACH ROW
  BEGIN
  SELECT 'Board_' || whole_seq.nextval INTO :new.whole_number FROM dual;
  IF :new.board = 'guide' THEN 
    SELECT guide_seq.nextval INTO :new.board_number FROM dual;
  ELSIF   :new.board = 'notify' THEN 
    SELECT notify_seq.nextval INTO :new.board_number FROM dual;
  END IF;
END;  
/

我可以在PL / SQL中使用IF吗？

1 个答案: