--第一种方法(自己使用过的,绿色安全无污染):
创建sequence,名为SEQ_LDBG? ,自增1,
CREATE SEQUENCE? SEQ_LDBG? AS INT START WITH 1 INCREMENT BY 1 MINVALUE 1???
?????? NO MAXVALUE NO CYCLE NO CACHE ORDER;?
--在sql中nextval for SEQ_LDBG这样使用,codechange7为表名,
select? nextval for SEQ_LDBG, code,name from codechange7;
?
?
---第二种方法:
CREATE SEQUENCE? SEQ_LDBG? START WITH 1 INCREMENT BY 1 NOMAXVALUE NOCYCLE CACHE 24;
--获取下一个值
select nextval for SEQ_LDBG?? from codechange7;
--获取当前值
select prevval for SEQ_LDBG?? from codechange7;
--插入记录
?
insert into codechange7(id) values ( NEXTVAL FOR? id)
?
--删除sequence
?? DROP SEQUENCE?? SEQ_LDBG???;?--序列设置开始值
?????ALTER SEQUENCE 序列名? (SEQ_LDBG???) RESTART WITH 下一值(1)
--修改
?修改最大值:?? ALTER SEQUENCE <sequence_name> MAX VALUE <numeric-constant> | NO MAXVALUE
?修改最小值:?? ALTER SEQUENCE <sequence_name> MIN VALUE <numeric-constant> | NO MINVALUE
?
(此值需要比当前值小)
?修改步长:??? ALTER SEQUENCE <sequence_name> INCREMENT BY <numeric-constant>;
?修改CACHE值: ALTER SEQUENCE <sequence_name> CACHE <numeric-constant> | NO CACHE
?修改循环属性: ALTER SEQUENCE <sequence_name> <CYCLE | NO CYCLE>
?修改排序属性:ALTER SEQUENCE <sequence_name> <ORDER | NO ORDER>
?从新计数:??? ALTER SEQUENCE <sequence_name> RESTART | RESTART WITH <numeric-constant>
?
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