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; 
$BODY$;