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;
