在oracle数据库里创建自增ID字段的步骤
在oracle里使用自增ID字段的步骤比较繁琐,总结如下:-- 创建表
CREATE TABLE ADVICE
(
ID INT NOT NULL,
ACTIVE INT DEFAULT 1 NOT NULL,
TYPE INT NOT NULL,
MSG VARCHAR2(512) NOT NULL,
ADVICE VARCHAR2(4000) NOT NULL,
PRIMARY KEY(ID),
CONSTRAINT ADVICE_UNI UNIQUE(TYPE,MSG)
)TABLESPACE MYDB;
--创建自增ID,名称为:表名_字段名_SEQ
CREATE SEQUENCE ADVICE_ID_SEQ MINVALUE 1 NOMAXVALUE INCREMENT BY 1 START WITH 1 NOCACHE;
-- 为Insert操作创建触发器,无需在SQL语句里写NEXTVAL,名称为表名_INS_TRG
CREATE OR REPLACE TRIGGER ADVICE_INS_TRG BEFORE INSERT ON ADVICE FOR EACH ROW WHEN(NEW.ID IS NULL)
BEGIN
SELECT ADVICE_ID_SEQ.NEXTVAL INTO :NEW.ID FROM DUAL;
END;
https://www.uoften.com/dbs/oracle/20180415/73232.html
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