GBase 8s 检查是否是IP且转数值函数
GBase 8s中没有ip类型字段(如inet),对于判断字符串是否是IP地址,需要自己编写相应的函数。
如下,实现检查输入的字符串是否为IPv4地址(-1否),且转换成数值类型:
-- function ip to num, if not ip return -1
DROP FUNCTION IF EXISTS func_ip2num(varchar);
CREATE FUNCTION func_ip2num(p_ip varchar(20))
RETURNS int8 WITH (NOT VARIANT);
define v_ip1 varchar(10);
define v_ip2 varchar(10);
define v_ip3 varchar(10);
define v_ip4 varchar(10);
define v_ipnum int8;
define v_delpos smallint;
define v_curpos smallint;
ON EXCEPTION
RETURN -1;
END EXCEPTION;
let v_ipnum = -1;
-- ip part1
let v_delpos = charindex('.',p_ip);
let v_ip1 = substr(p_ip,1,v_delpos - 1)::int;
-- ip part2
let v_curpos = v_delpos + 1;
let v_delpos = charindex('.',p_ip,v_curpos);
let v_ip2 = substr(p_ip,v_curpos,v_delpos - v_curpos)::int;
-- ip part3
let v_curpos = v_delpos + 1;
let v_delpos = charindex('.',p_ip,v_curpos);
let v_ip3 = substr(p_ip,v_curpos,v_delpos - v_curpos)::int;
-- ip part4
let v_curpos = v_delpos + 1;
let v_ip4 = substr(p_ip,v_curpos)::int;
IF v_ip1 < 0 OR v_ip2 < 0 OR v_ip3 < 0 OR v_ip4 < 0 OR
v_ip1 > 255 OR v_ip2 > 255 OR v_ip3 > 255 OR v_ip4 > 255 THEN
RETURN -1;
END IF;
let v_ipnum = v_ip1 * 16777216 + v_ip2 * 65536 + v_ip3 * 256 + v_ip4;
RETURN v_ipnum;
END FUNCTION;
示例:
SELECT func_ip2num('192.168.100.100') FROM dual; -- 返回:3232261220
SELECT func_ip2num('192.-168.100.100') FROM dual; -- 返回 -1,不是IP
SELECT func_ip2num('292.-168.100.100') FROM dual; -- 返回 -1,不是IP
注:当然仅仅需要判断是否为IP,也可以使用regexp_like功能:
SELECT regexp_like('192.168.100.100', '^(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$') FROM dual;