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Oracle生成單據編號存儲過程，在做訂單類似的系統都可能會存在訂單編號不重復，或是流水號按日，按年，按月進行重新編號。

可以參考以下存儲過程

				?

									CREATE OR REPLACE

									procedure Pro_GetBillNO(TypeTable in varchar2,cur_mycursor out sys_refcursor)

									as

									DReceiptCode varchar2(40);

									DReceiptName varchar2(50);

									DPrefix1 varchar2(50);

									DISO varchar2(50);

									DIsAutoCreate varchar2(20);

									DPrefix2 varchar2(20);

									DPrefix3 varchar2(20);

									DDateValue date;

									DNO number;

									DLength number;

									DResetType number;

									DSeparator varchar2(20);

									DReturnValue varchar2(50);

									strSql varchar2(1000);

									begin

									DReturnValue:='';

									select "ReceiptCode","ReceiptName","Prefix1","ISO","IsAutoCreate","Prefix2","Prefix3","DateValue","NO","Length","ResetType","Separator" into

									DReceiptCode,DReceiptName,DPrefix1,DISO,DIsAutoCreate,DPrefix2,DPrefix3,DDateValue,DNO,DLength,DResetType,DSeparator from

									"SysReceiptConfig" where "ReceiptCode"=TypeTable;

									if to_number(DResetType)>0

									then

									if DIsAutoCreate=1 THEN

									if DResetType=1 then --按年份

									if to_number(to_char(sysdate,'yyyy')) <>to_number(to_char(DDateValue,'yyyy')) then

									update "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;

									else

									update "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;

									end if; --年份

									end if;--DResetType=1

									if DResetType=2 then --按月份

									if to_number(to_char(sysdate,'MM')) <>to_number(to_char(DDateValue,'MM')) then

									update "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;

									else

									update "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;

									end if; --月份

									end if;--DResetType=2

									if DResetType=3 then --按日

									if to_number(to_char(sysdate,'dd')) <>to_number(to_char(DDateValue,'dd')) then

									update "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;

									else

									update "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;

									end if; --月份

									end if;--DResetType=3

									else

									update "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;

									end if;--DResetType

									end if;

									strSql:=' select * from "SysReceiptConfig" where 1=1 ';

									strSql:=strSql ||' and "ReceiptCode"='''||TypeTable||'''';

									open cur_mycursor for strSql;

									end;