oracle 判断是不是数值/数字

1. 利用 to_number

CREATE OR REPLACE FUNCTION isnumeric (str IN VARCHAR2)

RETURN NUMBER

IS

v_str FLOAT;

BEGIN

IF str IS NULL

THEN

RETURN 0;

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;


2. 利用 regexp_like

CREATE OR REPLACE FUNCTION isnumeric (str IN VARCHAR2)

RETURN NUMBER

IS

BEGIN

IF str IS NULL

THEN

RETURN 0;

ELSE

IF regexp_like (str, '^(-{0,1}+{0,1})[0-9]+(.{0,1}[0-9]+)$')

THEN

RETURN 1;

ELSE

RETURN 0;

END IF;

END IF;

END isnumeric;


3. 利用 TRANSLATE

CREATE OR REPLACE FUNCTION isnumeric (str IN VARCHAR2)

RETURN NUMBER

IS

v_str VARCHAR2 (1000);

BEGIN

IF str IS NULL

THEN

RETURN 0;

ELSE

v_str := TRANSLATE (str, '.0123456789', '.');

IF v_str = '.' OR v_str = '+.' OR v_str = '-.' OR v_str IS NULL

THEN

RETURN 1;

ELSE

RETURN 0;

END IF;

END IF;

END isnumeric;