Oracle 把秒转成时分秒格式(hh24:mm:ss);检测字符串是否是数字;字符串转换为数字

不说废话,贴代码:

 CREATE OR REPLACE FUNCTION to_time(sec IN NUMBER) RETURN VARCHAR2 IS
 /*把秒转成时分秒格式
 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
 /*检测字符串是否是数字 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;

 转换为数字:

如果要转换字母加数字的,得到数字, 那就得先用正则表达式过滤了:  REGEXP_SUBSTR, REGEXP_REPLACE

 CREATE OR REPLACE FUNCTION TO_NUM(str IN VARCHAR2) RETURN NUMBER IS
 --将字符串转成数字
 --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);
--将字符串(提取数字)转成数字
--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;