Oracle自增主键
2021/7/14 19:04:54
本文主要是介绍Oracle自增主键,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
mysql中自增主键:create table test(id primary key AUTO_INCREMENT) AUTO_INCREMENT=值;
Oracle中没有这种写法,Oracle中自增主键,需要靠序列和触发器实现
例:
drop table account_la; create table account_la( customer_id integer,--主键 customer_name varchar2(20) not null, --客户名 customer_id_card varchar2(20) not null, --客户身份证号 customer_sex char(4) default'男' not null,--客户性别 customer_phone number(11) not null,--客户手机号 customer_password varchar2(128) not null,--密码 create_time timestamp default sysdate not null,--注册时间,默认为系统当前时间 bank_id integer not null,--银行号 customer_address varchar2(256) not null,--客户地址 customer_status integer default 1 not null,--客户账户状态,0:不可用,1:可用 account_balance varchar2(64) not null,--账户余额 constraint account_pk primary key(customer_id), constraint check_sex check(customer_sex in ('男','女')), constraint check_status check(customer_status in(0,1)), constraint unique_id_card unique(customer_id_card), constraint unique_phone unique(customer_phone) ); drop sequence SEQ_account_autoid -- 创建account_la的序列,自增初始值为1,最大值为999999999999,每次加1 create sequence SEQ_account_autoid minvalue 1 maxvalue 999999999999 start with 1 increment by 1 nocache; drop trigger TRG_account_autoid; -- 创建account_la的触发器,每次插入值时查询序列的nextVal(下一个序列值) create trigger TRG_account_autoid before insert on account_la for each row when(new.customer_id is null) begin select SEQ_account_autoid.nextval into:new.customer_id from dual; end;
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