Oracle 把秒轉成時分秒格式(hh24:mm:ss);檢測字符串是否是數字;字符串轉換為數字

不說廢話,貼代碼:

CREATE OR REPLACE FUNCTION to_time(sec IN NUMBER) RETURN VARCHAR2 IS
/*把秒轉成時分秒格式
auth lzpong 201/09/16
*/
BEGIN
  RETURN TRUNC(NVL(sec,0)/3600)||':'||SUBSTR(NUMTODSINTERVAL(NVL(sec,0), 'second'),15,5);
EXCEPTION WHEN OTHERS THEN RETURN '0:00:00';
END to_time;


CREATE OR REPLACE FUNCTION isnumeric(str IN VARCHAR2) RETURN NUMBER IS
/*檢測字符串是否是數字 null:-1; notnumeric:0; isnumeric:1
*/
  v_str FLOAT;
BEGIN
  IF str IS NULL THEN
    RETURN -1;
  ELSE
  BEGIN
    SELECT TO_NUMBER (str) INTO v_str FROM DUAL;
  EXCEPTION
    WHEN INVALID_NUMBER THEN
      RETURN 0;
  END;
  RETURN 1;
  END IF;
END isnumeric;

 轉換為數字:

如果要轉換字母加數字的,得到數字, 那就得先用正則表達式過濾了:  REGEXP_SUBSTR, REGEXP_REPLACE

CREATE OR REPLACE FUNCTION TO_NUM(str IN VARCHAR2) RETURN NUMBER IS
--將字符串轉成數字
--lzpong 2015/09/16
BEGIN
  IF(str IS NULL)THEN
    RETURN 0;
  ELSE
    RETURN TO_NUMBER(str);
  END IF;
EXCEPTION
  WHEN OTHERS THEN
    RETURN 0;
END;

CREATE OR REPLACE FUNCTION TO_NUM(str IN VARCHAR2) RETURN NUMBER IS
str2 varchar2(160);
--將字符串(提取數字)轉成數字
--lzpong 2015/09/16
BEGIN
  str2:=REGEXP_SUBSTR(str,'[[:digit:]]{1,100}\.?[[:digit:]]{0,10}');
  IF(str2 IS NULL)THEN
    RETURN 0;
  ELSE
    RETURN TO_NUMBER(str2);
  END IF;
EXCEPTION
  WHEN OTHERS THEN
    RETURN 0;
END;