Oracle實現金額小寫轉大寫函數

今天工作的時候遇到了，然後上網百度了一下，發現了有個大佬寫了一個很牛的函數，在此記錄下來。

原文：http://www.itpub.net/thread-240281-1-1.html

函數：

create or replace function F_upper_money(p_num in number default null)
return nvarchar2 is
/*Ver:1.0 Created By xsb on 2003-8-18 For:
        將金額數字(單位元)轉換為大寫(採用從低至高演算法)
        數字整數部分不得超過16位,可以是負數。
Ver：1.1 Modified By xsb on 2003-8-20 For:個位數處理也放在For迴圈中。        
Ver：1.2 Modified By xsb on 2003-8-22 For:分後不帶整字。
Ver：1.3 Modified By xsb on 2003-8-28 For:完善測試用例。
測試用例:
SET HEAD OFF
SET FEED OFF
select '無參數時='||f_upper_money() from dual;
select 'null='||f_upper_money(null) from dual;
select '0='||f_upper_money(0) from dual;
select '0.01='||f_upper_money(0.01) from dual;
select '0.126='||f_upper_money(0.126) from dual;
select '01.234='||f_upper_money(01.234) from dual;
select '10='||f_upper_money(10) from dual;
select '100.1='||f_upper_money(100.1) from dual;
select '100.01='||f_upper_money(100.01) from dual;
select '10000='||f_upper_money(10000) from dual;
select '10012.12='||f_upper_money(10012.12) from dual;        
select '20000020.01='||f_upper_money(20000020.01) from dual;
select '3040506708.901='||f_upper_money(3040506708.901) from dual;
select '40005006078.001='||f_upper_money(40005006078.001) from dual;
select '-123456789.98='||f_upper_money(-123456789.98) from dual;
select '123456789123456789.89='||f_upper_money(123456789123456789.89) from dual;

*/
Result nvarchar2(100);--返回字元串
num_round nvarchar2(100) :=to_char(abs(round(p_num,2)));--轉換數字為小數點後2位的字元(正數)
num_left nvarchar2(100);--小數點左邊的數字
num_right nvarchar2(2);--小數點右邊的數字
str1 nchar(10) :='零壹貳參肆伍陸柒捌玖';--數字大寫
str2 nchar(16) :='元拾佰仟萬拾佰仟億拾佰仟萬拾佰仟';--數字位數(從低至高)
num_pre number(1):=1;--前一位上的數字
num_current number(1);--當前位上的數字
num_count number:=0;--當前數字位數

begin
if p_num is null then return null;end if;--轉換數字為null時返回null

select to_char(
nvl(substr(to_char(num_round),1,
decode(instr(to_char(num_round),'.'),0,
length(num_round),instr(to_char(num_round),'.')-1)),
0)) into num_left from dual;--取得小數點左邊的數字
select substr(to_char(num_round),
decode(instr(to_char(num_round),'.'),0,
length(num_round)+1,instr(to_char(num_round),'.')+1),2)
into num_right from dual;--取得小數點右邊的數字

if length(num_left)>16 then return '**********'; end if;--數字整數部分超過16位時

  --採用從低至高的演算法，先處理小數點右邊的數字
  if length(num_right)=2 then
    if to_number(substr(num_right,1,1))=0 then
     result:='零'||substr(str1,to_number(substr(num_right,2,1))+1,1)||'分';
    else
     result:=substr(str1,to_number(substr(num_right,1,1))+1,1)||'角'||
             substr(str1,to_number(substr(num_right,2,1))+1,1)||'分';
    end if;           
  elsif length(num_right)=1 then
    result:=substr(str1,to_number(substr(num_right,1,1))+1,1)||'角整';
  else  
    result :='整';
  end if;
  --再處理小數點左邊的數字
  for i in reverse 1..length(num_left)  loop --(從低至高)
      num_count:=num_count+1;--當前數字位數
      num_current:=to_number(substr(num_left,i,1));--當前位上的數字
      if num_current>0 then --當前位上數字不為0按正常處理
         result:=substr(str1,num_current+1,1)||substr(str2,num_count,1)||result;
      else --當前位上數字為0時
          if mod(num_count-1,4)=0 then --當前位是元、萬或億時
            result:=substr(str2,num_count,1)||result;
            num_pre:=0;--元、萬,億前不准加零
          end if;        
          if  num_pre>0 or length(num_left)=1 then  --上一位數字不為0或只有個位時
              result:=substr(str1,num_current+1,1)||result;
          end if;        
       end if;
       num_pre:=num_current;
  end loop;
  
  if p_num<0 then --轉換數字是負數時
     result:='負'||result;
  end if;
  
  return Result;
  
  exception
  when others  then
  raise_application_error(-20001,'數字轉換大寫出現錯誤！'||sqlerrm);
end ;

調用效果如下：

-- 無參數，結果為：null=
select 'null='||f_upper_money(null) total from dual;

-- 0=零元整
select '0='||f_upper_money(0) total from dual;

-- 0.05=零元零伍分
select '0.05='||f_upper_money(0.05) total from dual;

-- 0.155=零元壹角陸分
select '0.155='||f_upper_money(0.155) total from dual;

-- 01.125=壹元壹角參分
select '01.125='||f_upper_money(01.125) total from dual;

-- 10=壹拾元整
select '10='||f_upper_money(10) total from dual;

-- 100.5=壹佰元伍角整
select '100.5='||f_upper_money(100.5) total from dual;

-- 100.05=壹佰元零伍分
select '100.05='||f_upper_money(100.05) from dual;

-- 10000=壹萬元整
select '10000='||f_upper_money(10000) from dual;

-- 10025.52=壹萬零貳拾伍元伍角貳分
select '10025.52='||f_upper_money(10025.52) from dual;

-- 50000020.05=伍仟萬零貳拾元零伍分
select '50000020.05='||f_upper_money(50000020.05) from dual;

-- 5040302105.501=伍拾億肆仟零參拾萬貳仟壹佰零伍元伍角整
select '5040302105.501='||f_upper_money(5040302105.501) from dual;

-- 50002001075.001=伍佰億零貳佰萬壹仟零柒拾伍元整
select '50002001075.001='||f_upper_money(50002001075.001) from dual;

-- -123456789.15=負壹億貳仟參佰肆拾伍萬陸仟柒佰捌拾玖元壹角伍分
select '-123456789.15='||f_upper_money(-123456789.15) from dual;

-- 123456789123456789.89=**********
select '123456789123456789.89='||f_upper_money(123456789123456789.89) from dual;