Oracle PL SQL将金额数字转换成大写

http://blog.sina.com.cn/s/blog_6a3922be0101a72t.html
CREATE OR REPLACE FUNCTION SMALITOBLG(
SMALLMONEY VARCHAR2
)
RETURN VARCHAR2 IS
BIGWRITE VARCHAR2(54); -- 用于负担会答谢的钱数
BIGNUM VARCHAR(2);     -- 用于存放每一个阿拉伯数字对应的汉子
RMB VARCHAR(2);        -- 用于存放人民币单位
MONEYPLACE NUMBER;     -- 用于确定人民币的精度，最多只能精确到分
DOTPLACE NUMBER;       -- 确定小数点的位置
MONEYNUM NUMBER;       -- 人民币的位置
MYEXCEPTION EXCEPTION; -- 自定义异常
BEGIN
 
   DOTPLACE := INSTR(SMALLMONEY,'.');
 
   IF(LENGTH(SMALLMONEY) > 14) OR ((LENGTH(SMALLMONEY) > 12) AND (DOTPLACE = 0)) THEN
       RAISE MYEXCEPTION;
   END IF;
 
   IF DOTPLACE = 0 THEN
      MONEYPLACE := 0;
   ELSE
      MONEYPLACE := DOTPLACE - LENGTH(SMALLMONEY);
   END IF;
 
   FOR MONEYNUM IN REVERSE 1..LENGTH(SMALLMONEY) LOOP
   
     IF MONEYNUM <> DOTPLACE THEN
      
       CASE SUBSTR(SMALLMONEY,MONEYNUM,1)
          WHEN '1' THEN BIGNUM := '壹';
          WHEN '2' THEN BIGNUM := '贰';
          WHEN '3' THEN BIGNUM := '叁';
          WHEN '4' THEN BIGNUM := '肆';
          WHEN '5' THEN BIGNUM := '伍';
          WHEN '6' THEN BIGNUM := '陆';
          WHEN '7' THEN BIGNUM := '柒';
          WHEN '8' THEN BIGNUM := '捌';
          WHEN '9' THEN BIGNUM := '玖';
          WHEN '0' THEN BIGNUM := '零';
       END CASE;
       CASE MONEYPLACE
          WHEN '-2' THEN RMB := '分';
          WHEN '-1' THEN RMB := '角';
          WHEN '0' THEN RMB := '元';
          WHEN '1' THEN RMB := '拾';
          WHEN '2' THEN RMB := '佰';
          WHEN '3' THEN RMB := '仟';
          WHEN '4' THEN RMB := '萬';
          WHEN '5' THEN RMB := '拾';
          WHEN '6' THEN RMB := '佰';
          WHEN '7' THEN RMB := '仟';
          WHEN '8' THEN RMB := '亿';
          WHEN '9' THEN RMB := '拾';
          WHEN '10' THEN RMB := '佰';
          WHEN '11' THEN BIGNUM := '仟';
       END CASE;
       MONEYPLACE := MONEYPLACE + 1;
       IF BIGWRITE IS NULL THEN
         BIGWRITE := BIGNUM || RMB;
       ELSE
         BIGWRITE := BIGNUM || RMB || BIGWRITE;
       END IF;
     END IF;
   END LOOP;
   RETURN BIGWRITE;
   EXCEPTION -- 异常处理部分
   WHEN MYEXCEPTION THEN
      DBMS_OUTPUT.PUT_LINE('该函数只能转换长度不大于14位或整数位不大于12位的钱数！');
   WHEN OTHERS THEN
      DBMS_OUTPUT.PUT_LINE('不是有效的钱数！');
END SMALITOBLG;