Oracle生成单据编号存储过程，在做订单类似的系统都可能会存在订单编号不重复，或是流水号按日，按年，按月进行重新编号。

可以参考以下存储过程

CREATE OR REPLACEprocedure Pro_GetBillNO(TypeTable in varchar2,cur_mycursor out sys_refcursor)asDReceiptCode 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);beginDReturnValue:='';select "ReceiptCode","ReceiptName","Prefix1","ISO","IsAutoCreate","Prefix2","Prefix3","DateValue","NO","Length","ResetType","Separator" intoDReceiptCode,DReceiptName,DPrefix1,DISO,DIsAutoCreate,DPrefix2,DPrefix3,DDateValue,DNO,DLength,DResetType,DSeparator from"SysReceiptConfig" where "ReceiptCode"=TypeTable;if to_number(DResetType)>0thenif DIsAutoCreate=1 THENif DResetType=1 then --按年份if to_number(to_char(sysdate,'yyyy')) <>to_number(to_char(DDateValue,'yyyy')) thenupdate "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;elseupdate "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;end if; --年份end if;--DResetType=1if DResetType=2 then --按月份if to_number(to_char(sysdate,'MM')) <>to_number(to_char(DDateValue,'MM')) thenupdate "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;elseupdate "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;end if; --月份end if;--DResetType=2if DResetType=3 then --按日if to_number(to_char(sysdate,'dd')) <>to_number(to_char(DDateValue,'dd')) thenupdate "SysReceiptConfig" set "NO"=1,"DateValue"=to_date(sysdate) where "ReceiptCode"=TypeTable;elseupdate "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;end if; --月份end if;--DResetType=3elseupdate "SysReceiptConfig" set "NO"="NO"+1 where "ReceiptCode"=TypeTable;end if;--DResetTypeend if;strSql:=' select * from "SysReceiptConfig" where 1=1 ';strSql:=strSql ||' and "ReceiptCode"='''||TypeTable||'''';open cur_mycursor for strSql;end;

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