实现IP地址与数值之间的转换

将"169.254.55.6" 转换为 2852009734

 2852009734 = 0xA9FE3706
  0xA9 对应 169
  0xFE 对应 254
  0x37 对应 55
  0x6 对应 06

 

create or replace function ip2number(ip varchar2) return number is ip_num_hex varchar2(80); begin if (regexp_like(ip, '^(/d{1,3})/.(/d{1,3})/.(/d{1,3})/.(/d{1,3})$')) then ip_num_hex := lpad(trim(to_char(regexp_replace(ip, '^(/d{1,3})/.(/d{1,3})/.(/d{1,3})/.(/d{1,3})$', '/1'), 'XX')),2,'0') || lpad(trim(to_char(regexp_replace(ip, '^(/d{1,3})/.(/d{1,3})/.(/d{1,3})/.(/d{1,3})$', '/2'), 'XX')),2,'0') || lpad(trim(to_char(regexp_replace(ip, '^(/d{1,3})/.(/d{1,3})/.(/d{1,3})/.(/d{1,3})$', '/3'), 'XX')),2,'0') || lpad(trim(to_char(regexp_replace(ip, '^(/d{1,3})/.(/d{1,3})/.(/d{1,3})/.(/d{1,3})$', '/4'), 'XX')),2,'0'); return to_number(ip_num_hex, 'XXXXXXXX'); else return -1; end if; exception when others then return -99999999999; end; select ip2number('169.254.55.6') from dual; IP2NUMBER('169.254.55.6') ------------------------- 2852009734 create or replace function number2ip(num number) return varchar2 is ip_num_hex varchar2(8); begin ip_num_hex := lpad(trim(to_char(num, 'XXXXXXXX')), 8, '0'); return to_number(substr(ip_num_hex, 1, 2), 'XX') || '.' || to_number(substr(ip_num_hex, 3, 2), 'XX') || '.' || to_number(substr(ip_num_hex, 5, 2), 'XX') || '.' || to_number(substr(ip_num_hex, 7, 2), 'XX'); exception when others then dbms_output.put_line(sqlerrm); return null; end; select number2ip(2852009734) from dual; NUMBER2IP(2852009734) -------------------------------------------------------------------------------- 169.254.55.6