ip地址存储建议用int还是varchar(15),效率有差别吗
看到有的数据库结构ip用int存储，然后通过ip2long转化，不过这个函数好像有bug，大家怎么看？
回复内容：
看到有的数据库结构ip用int存储，然后通过ip2long转化，不过这个函数好像有bug，大家怎么看？
Mysql可以参考这个答案。
Postgres直接由网络地址类型，参考这里
用varchar或者char
理由：
1.省去转化的过程
2.ipv4或ipv6的都可以存
两种都存不就好
一般网站只是记录用户的一些信息用varchar(15)就行了
int一般是做ip库用的，容易分段记录查询一个ip的所属省市等
用int存省空间，只用4个字节，char的话要用7~15个字节。
最重要的是方便查询比较（数值比较），而且设置整形为索引也比char效率高。
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