Oracle利用sequence实现递增

--创建存储过程 
CREATE OR REPLACE Procedure insert_vsunusedmark 
( VisaKindCode In varchar, 
StartSerialNo In Varchar, 
EndSerialNo In Varchar,
NumInsert In Varchar,
visapre In Varchar,
visacode In Varchar,
visaname In Varchar,
pressbatchno In Varchar,
businessno In Varchar,
visaamount In NUMBER,
usedate In DATE,
usertype In Varchar,
usercode In Varchar,
username In Varchar,
visastatus In Varchar,
providetimes In NUMBER,
recycletimes In NUMBER,
verifiedcancelflag In Varchar,
beforestatus In Varchar,
remark In Varchar,
flag In Varchar,
comcode In Varchar,
usedenddate In DATE,
forcecalldays In Varchar,
policypremium In NUMBER
) AS strsql varchar2(5000);
v_count int;
Begin
-- 判断sequence是否已存在，存在则删除重建
select count(1) into v_count from All_Sequences a where sequence_name = upper(VisaKindCode);
if v_count > 0 then
execute immediate 'drop sequence '||VisaKindCode;
end if;
-- Create sequence 
strsql := 'create sequence '||VisaKindCode||' 
minvalue '||StartSerialNo||' 
maxvalue '||EndSerialNo||' 
start with '||StartSerialNo||' 
increment by 1 
cache 20'; 
execute immediate strsql; 
strsql := 
'insert into vsunusedmark 
( visaserialno, 
visapre, 
visacode, 
visaname, 
pressbatchno, 
businessno, 
visaamount, 
usedate, 
usertype, 
usercode, 
username, 
visastatus, 
providetimes, 
recycletimes, 
verifiedcancelflag, 
beforestatus, 
remark, 
flag, 
comcode, 
usedenddate, 
forcecalldays, 
policypremium) 
select '||VisaKindCode||'.NEXTVAL, 
'''||visapre||''',
'''||visacode||''', 
'''||visaname||''',
'''||pressbatchno||''',
'''||businessno||''',
'''||visaamount||''', 
'''||usedate||''', 
'''||usertype||''', 
'''||usercode||''', 
'''||username||''', 
'''||visastatus||''', 
'''||providetimes||''', 
'''||recycletimes||''', 
'''||verifiedcancelflag||''', 
'''||beforestatus||''', 
'''||remark||''', 
'''||flag||''', 
'''||comcode||''', 
'''||usedenddate||''', 
'''||forcecalldays||''', 
'''||policypremium||'''
from vsunusedmark v where rownum<='||NumInsert||''; 
execute immediate strsql;
exception
WHEN OTHERS THEN
--发生异常,回滚
rollback;
Commit; 
End insert_vsunusedmark;