oracle自定义函数的执行时间

核心提示：--版本2create or replace FUNCTION f_extract_birthday(certtype IN varchar, certno in VARCHAR, birthday in VARCHAR)RETURN VARCHARISlen SMALLINT;c SMALLINT;val NUMER

--版本2
create or replace FUNCTION f_extract_birthday(certtype IN varchar, certno in VARCHAR, birthday in VARCHAR)
RETURN VARCHAR
IS
len SMALLINT;
c SMALLINT;
val NUMERIC(18, 0);
ret VARCHAR(4);
BEGIN
ret := ''; IF certtype = '0' THEN -- 身份证
BEGIN
len := length(certno);

if (len = 15) THEN
val := CAST(certno AS NUMERIC);
ret := '19' || substr(certno, 7, 2);
ELSIF (len = 18) THEN
val := CAST(substr(certno, 1, 17) AS NUMERIC);
c := ascii(substr(certno, 18, 1));

--if i <> 18 OR (c <> 88 AND c <> 120) OR c < 48 or c > 57 THEN -- 第18位为[0-9xX]
if (c = 88 OR c = 120 OR c >= 48 or c <= 57) THEN -- 第18位为[0-9xX]
ret := substr(certno, 7, 4);
end if;
end if;
EXCEPTION
WHEN value_error THEN -- 字符串转实数错误
NULL;
END;
END IF;

BEGIN
IF ret IS NULL THEN
val := CAST(birthday AS NUMERIC);
ret := substr(birthday, 1, 4);
END IF;

EXCEPTION
WHEN value_error THEN
NULL;
END;

BEGIN
-- 判断年份是否合法，暂定[1900, 2000]区间，过几年需要修改
--IF (ret <> '') THEN
IF (ret IS NOT NULL) THEN
val := CAST(ret AS INT);
IF (val < 1900 OR val > 2000) THEN
ret := '';
END IF;
END IF;
EXCEPTION
WHEN value_error THEN -- 字符串转实数错误
ret := '';
--dbms_output.put_line(certno || ',' || ret);
END;

RETURN ret;
end f_extract_birthday;