Home Database Mysql Tutorial Oracle 动态主键序列创建

Oracle 动态主键序列创建

Jun 07, 2016 pm 02:57 PM
oracle primary key reserve create dynamic sequence data avoid

1.要保留原始的数据时,避免主键重复。每次删除序列再重建是不是很较麻烦呢?那么用这个语句简单方便多了。 3个参数:order_sq是序列名。order是表名,内部的主键是id。 2.写完语句验证是否正确可以用pl/slq-新建-测试窗口,进行单步调试。谢谢。 Oracle drop

1.要保留原始的数据时,避免主键重复。每次删除序列再重建是不是很较麻烦呢?那么用这个语句简单方便多了。
3个参数:order_sq是序列名。order是表名,内部的主键是id。

2.写完语句验证是否正确可以用pl/slq->新建->测试窗口,进行单步调试。谢谢。
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drop sequence order;

declare

v_sql varchar2(1000);

v_num number(20):=1;

begin

v_sql:='create sequence order_sq';

select max(order_sq.id)+1 into v_num from order;

if v_num is null then v_num :=1;

end if;

v_sql:=v_sql||' minvalue 1 maxvalue 9999999999999999999999999999 start with '||v_num ||' increment by 1 cache 20';

execute immediate v_sql;

end;

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Oracle 动态主键序列创建
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