1、什么是序列呢?

序列是一数据库对象,利用它可生成唯一的整数。一般使用序列自动地生成主码值。一个序列的值是由特别的Oracle程序自动生成,因而序列避免了在运用层实现序列而引起的性能瓶颈。

Oracle序列允许同时生成多个序列号,而每一个序列号是唯一的。 当一个序列号生成时,序列是递增,独立于事务的提交或回滚。容许设计缺省序列,不需指定任何子句。该序列为上升序列

,由1开始,增量为1,没有上限。

2、创建/修改序列的语法

--创建序列的语法 --
create sequence [user.]sequence_name
[increment by n]
[start with n]
[maxvalue n | nomaxvalue]
[minvalue n | nominvalue]; --修改序列的语法--
alter sequence [user.]sequence_name
[increment by n]
[maxvalue n | nomaxvalue]
[minvalue n | nominvalue];

3、序列参数说明

    INCREMENT BY: 指定序列号之间的间隔,该值可为正的或负的整数,但不可为0。序列为升序。忽略该子句时,缺省值为1。
START WITH:指定生成的第一个序列号。在升序时,序列可从比最小值大的值开始,缺省值为序列的最小值。对于降序,序列可由比最大值小的值开始,缺省值为序列的最大值。
MAXVALUE:指定序列可生成的最大值。
NOMAXVALUE:为升序指定最大值为1027,为降序指定最大值为-1。
MINVALUE:指定序列的最小值。
NOMINVALUE:为升序指定最小值为1。为降序指定最小值为-1026。

4、序列示例

--创建示例表 --
create table Student(
stuId number(9) not null,
stuName varchar2(20) not null,
stuMsg varchar2(50) null
) -- 创建序列 Student_stuId_Seq --
create sequence Student_stuId_Seq
increment by 1
start with 1
minvalue 1
maxvalue 999999999; -- 更改序列 Student_stuId_Seq--
alter sequence Student_stuId_Seq
increment by 2
minvalue 1
maxvalue 999999999; --获取序列自增ID --
select Student_stuId_Seq.Nextval 自增序列ID from dual; -- 删除序列 --
drop sequence Student_stuId_Seq; --调用序列,插入Student数据 --
insert into Student(stuId,Stuname) values(Student_stuId_Seq.Nextval,'张三');
insert into Student(stuId,Stuname) values(Student_stuId_Seq.Nextval,'李四');
--查询插入的数据 --
select * from Student

5、示例结果

1)创建序列后,执行获取序列自增ID

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" 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2)修改序列后,执行获取序列自增ID

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" alt="" width="580" height="130" />

3) 查询插入数据

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Ps: 参考学习地址:http://blog.itpub.net/31123655/viewspace-2125276/

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