oracle 实现identity

--创建seq和trigger

create or replace procedure pr_CreateIdentityColumn
(tablename varchar2,columnname varchar2)
as
strsql varchar2(1000);
begin
       strsql := 'create sequence seq_'||tablename||' minvalue 1 maxvalue 999999999 start with 1 increment by 1 nocache';
       execute immediate strsql;
       strsql := 'create or replace trigger trg_'||tablename||' before insert on '||tablename||' for each row begin select seq_'||tablename||'.nextval into :new.'||columnname||' from dual; end;';
       execute immediate strsql;
end;
-- 授权
GRANT CREATE ANY SEQUENCE TO "PM_DEV";
GRANT CREATE ANY TRIGGER TO "PM_DEV";

--执行
exec pr_createidentitycolumn('tbname','colname');