如果要存ip地址,用什么数据类型比较好
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节省空间,不管是数据存储空间,还是索引存储空间 -
便于使用范围查询(BETWEEN…AND),且效率更高
https://bafford.com/2009/03/09/mysql-performance-benefits-of-storing-integer-ip-addresses/
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不便于阅读 -
需要手动转换
mysql> select inet_aton('192.168.0.1'); +--------------------------+ | inet_aton('192.168.0.1') | +--------------------------+ | 3232235521 | +--------------------------+ 1 row in set (0.00 sec) mysql> select inet_ntoa(3232235521) ; +-----------------------+ | inet_ntoa(3232235521) | +-----------------------+ | 192.168.0.1 | +-----------------------+ 1 row in set (0.00 sec)
对于IPv6来说,使用VARBINARY同样可获得相同的好处,同时MySQL也提供了相应的转换函数,即INET6_ATON和INET6_NTOA。
package com.mikan; /** * @author Mikan * @date 2015-09-22 10:59 */ public class IpLongUtils { /** * 把字符串IP转换成long * * @param ipStr 字符串IP * @return IP对应的long值 */ public static long ip2Long(String ipStr) { String[] ip = ipStr.split("\\."); return (Long.valueOf(ip[0]) << 24) + (Long.valueOf(ip[1]) << 16) + (Long.valueOf(ip[2]) << 8) + Long.valueOf(ip[3]); } /** * 把IP的long值转换成字符串 * * @param ipLong IP的long值 * @return long值对应的字符串 */ public static String long2Ip(long ipLong) { StringBuilder ip = new StringBuilder(); ip.append(ipLong >>> 24).append("."); ip.append((ipLong >>> 16) & 0xFF).append("."); ip.append((ipLong >>> 8) & 0xFF).append("."); ip.append(ipLong & 0xFF); return ip.toString(); } public static void main(String[] args) { System.out.println(ip2Long("192.168.0.1")); System.out.println(long2Ip(3232235521L)); System.out.println(ip2Long("10.0.0.1")); } }
3232235521
192.168.0.1
167772161
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