w如何通过一个mysql方法，而不是借助脚本判断？INET6_ATON(expr)
https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_inet-aton
https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html#function_inet6-aton
Given an IPv6 or IPv4 network address as a string, returns a binary string that represents the numeric value of the address in network byte order (big endian). Because numeric-format IPv6 addresses require more bytes than the largest integer type, the representation returned by this function has the VARBINARY data type: VARBINARY(16) for IPv6 addresses and VARBINARY(4) for IPv4 addresses. If the argument is not a valid address, INET6_ATON() returns NULL.
The following examples use HEX() to display the INET6_ATON() result in printable form:
原文：http://www.cnblogs.com/yuanjiangw/p/6347517.html