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

 1 CREATE OR REPLACE FUNCTION to_time(sec IN NUMBER) RETURN VARCHAR2 IS
 2 /*把秒转成时分秒格式
 3 auth lzpong 201/09/16
 4 */
 5 BEGIN
 6   RETURN TRUNC(NVL(sec,0)/3600)||‘:‘||SUBSTR(NUMTODSINTERVAL(NVL(sec,0), ‘second‘),15,5);
 7 EXCEPTION WHEN OTHERS THEN RETURN ‘0:00:00‘;
 8 END to_time;
 9 
10 
11 CREATE OR REPLACE FUNCTION isnumeric(str IN VARCHAR2) RETURN NUMBER IS
12 /*检测字符串是否是数字 null:-1; notnumeric:0; isnumeric:1
13 */
14   v_str FLOAT;
15 BEGIN
16   IF str IS NULL THEN
17     RETURN -1;
18   ELSE
19   BEGIN
20     SELECT TO_NUMBER (str) INTO v_str FROM DUAL;
21   EXCEPTION
22     WHEN INVALID_NUMBER THEN
23       RETURN 0;
24   END;
25   RETURN 1;
26   END IF;
27 END isnumeric;