postgres判断字符串是否为时间,数字

时间判断函数定义:

-- FUNCTION: public.isdate(character varying)

-- DROP FUNCTION public.isdate(character varying);

CREATE OR REPLACE FUNCTION public.isdate(
    datestr character varying)
    RETURNS boolean
    LANGUAGE 'plpgsql'

    COST 100
    VOLATILE
AS $BODY$
BEGIN

IF (dateStr IS NULL) THEN
     RETURN FALSE;
END IF;
     PERFORM dateStr::timestamp;
     RETURN TRUE;
EXCEPTION
     WHEN others THEN
     RETURN FALSE;

END;
$BODY$;

数字判断函数定义:

 -- FUNCTION: public.isnumeric(character varying)

 -- DROP FUNCTION public.isnumeric(character varying);

 CREATE OR REPLACE FUNCTION public.isnumeric(
     txtstr character varying)
     RETURNS boolean
     LANGUAGE 'plpgsql'

     COST 100
     VOLATILE
 AS $BODY$
 BEGIN 

 RETURN txtStr ~ '^([0-9]+[.]?[0-9]*|[.][0-9]+)$'; 

 END;
 $BODY$;