Oracle auto increment trigger issue

问题

I am having an issue when creating the auto increment trigger in Oracle 11g. If someone can point out what I am doing wrong, I would really appreciate it. My script for the sequence is this :

CREATE SEQUENCE SPSS_QUOTE_LINE_ITEMS_SEQ start with 1
increment by 1
minvalue 1;

The script for trigger:

CREATE OR REPLACE TRIGGER SPSSQUOTELINEITEMS_ON_INSERT
BEFORE INSERT ON SPSS_QUOTE_LINE_ITEMS
FOR EACH ROW

BEGIN
 SELECT SPSS_QUOTE_LINE_ITEMS_SEQ.NEXTVAL
 INTO   :new.line_num
 FROM   dual;
END;

The error I am getting: [Code: 900, SQL State: 42000] ORA-00900: invalid SQL statement

Thanks a lot.

回答1:

The correct way of doing this to modify your trigger as below:

CREATE OR REPLACE TRIGGER SPSSQUOTELINEITEMS_ON_INSERT
BEFORE INSERT ON SPSS_QUOTE_LINE_ITEMS
FOR EACH ROW
BEGIN

 :new.line_num := SPSS_QUOTE_LINE_ITEMS_SEQ.NEXTVAL;
 --No need to write any Select Into statement here.
END;

Or if i follow your way then it goes like

CREATE OR REPLACE TRIGGER SPSSQUOTELINEITEMS_ON_INSERT
BEFORE INSERT ON SPSS_QUOTE_LINE_ITEMS
FOR EACH ROW
declare
var number;

BEGIN

SELECT SPSS_QUOTE_LINE_ITEMS_SEQ.NEXTVAL
 INTO   var
 FROM   dual;

 :new.line_num :=var;

END;

You normally use the terms in a trigger using :old to reference the old value of the column and :new to reference the new value.

来源：https://stackoverflow.com/questions/39084327/oracle-auto-increment-trigger-issue