mysql - 在 LOAD DATA LOCAL INFILE 中使用 INET6_ATON 时返回 null

Question

我正在使用 MySQL 5.6，正在尝试新功能，例如 INET6_ATON 和 IS_IPV6。 当脚本读取 IPV4 时，它会将数据完美地插入到表中。但是，当涉及到 IPv6 时，其中一行 (ipTo) 会失败，即使 INET6_ATON 单独工作也是如此。

我的表格:4 个字段

`geoIPID` INT NOT NULL AUTO_INCREMENT ,
`IPFrom` VARBINARY(16) NOT NULL ,
`IPTo` VARBINARY(16) NOT NULL ,
`countries_countryID` INT NOT NULL

将文本文件加载到表中的脚本:

LOAD DATA LOCAL INFILE '/Users/Invictus/Documents/htdocs/overkill/etcs/IPV6.csv' 
INTO TABLE `overkill`.`geoIP` 
   FIELDS TERMINATED BY ',' ENCLOSED BY '"' 
   LINES TERMINATED BY '\n' 
(@IPFrom, @IPTo, @dummy, @dummy, @countryAbbreviation, @dummy) 
SET IPFrom = IF(IS_IPV4(@IPFrom), 
                 INET_ATON(@IPFrom), 
                 INET6_ATON(@IPFrom)), 
    IPTo = IF(IS_IPV4(@IPTo), 
              INET_ATON(@IPTo), 
              INET6_ATON(@IPTo)), 
    countries_countryID = 
    (
      SELECT IF (COUNT(*) != 0, `countries`.`countryID`, 999) 
        FROM `countries` 
       WHERE `countries`.`countryAbbreviation` = @countryAbbreviation 
       LIMIT 1
    );

IPV4.csv 文件，如下所示:

"1.0.0.0","1.0.0.255","16777216","16777471","AU","Australia"
"1.0.1.0","1.0.3.255","16777472","16778239","CN","China"
"1.0.4.0","1.0.7.255","16778240","16779263","AU","Australia"

IPV6.csv 文件，如下所示:

"2001:200::", "2001:200:ffff:ffff:ffff:ffff:ffff:ffff", "42540528726795050063891204319802818560", "42540528806023212578155541913346768895", "JP", "Japan"
"2001:208::", "2001:208:ffff:ffff:ffff:ffff:ffff:ffff", "42540529360620350178005905068154421248", "42540529439848512692270242661698371583", "SG", "Singapore"
"2001:218::", "2001:218:ffff:ffff:ffff:ffff:ffff:ffff", "42540530628270950406235306564857626624", "42540530707499112920499644158401576959", "JP", "Japan"

我的问题:

如果我加载 IPv6，第二行 (ipTo) 为 NULL。为什么？文件中的所有值都是有效的，但是 MySQL 不会转换它们。

Answer 1

问题不在 INET6_ATON 中，而是在您的 IPV6.csv 文件中。与 IPV4.csv 不同，逗号后面有额外的空格，这使得 LOAD DATA 像这样读取第二个字段

 "2001:200:ffff:ffff:ffff:ffff:ffff:ffff" 
^^                                      ^

这就是 INET6_ATON 返回 NULL 的原因。

要解决此问题:

1. 删除 csv 文件中的多余空格
2. 或将分隔符更改为FIELDS TERMINATED BY ', '

此外，您还可以简化查询，只需使用 INET6_ATON，而不是有条件地在 INET_ATON 和 INET6_ATON 之间切换。后者适用于 IPV4 和 IPV6。

话虽这么说，您的查询可能如下所示(假设您的 csv 文件中没有多余的空格)

LOAD DATA LOCAL INFILE '/Users/Invictus/Documents/htdocs/overkill/etcs/IPV6.csv' 
INTO TABLE `overkill`.`geoIP` 
   FIELDS TERMINATED BY ',' ENCLOSED BY '"' 
   LINES TERMINATED BY '\n' 
(@ipfrom, @ipto, @dummy, @dummy, @abbr, @dummy) 
SET IPFrom = INET6_ATON(@ipfrom), 
    IPTo   = INET6_ATON(@ipto), 
    countries_countryID = 
    (
      SELECT IF(COUNT(*) != 0, `countries`.`countryID`, 999) 
        FROM `countries` 
       WHERE `countries`.`countryAbbreviation` = @abbr 
       LIMIT 1
    );

为了进行测试，我删除了多余的空格，合并了两个文件，并将它们加载到 ipv6 表中。这是结果

mysql> select geoIPID, HEX(ipfrom), HEX(ipto) from ipv6;
+---------+----------------------------------+----------------------------------+
| geoIPID | HEX(ipfrom)                      | HEX(ipto)                        |
+---------+----------------------------------+----------------------------------+
|       1 | 20010200000000000000000000000000 | 20010200FFFFFFFFFFFFFFFFFFFFFFFF |
|       2 | 20010208000000000000000000000000 | 20010208FFFFFFFFFFFFFFFFFFFFFFFF |
|       3 | 20010218000000000000000000000000 | 20010218FFFFFFFFFFFFFFFFFFFFFFFF |
|       4 | 01000000                         | 010000FF                         |
|       5 | 01000100                         | 010003FF                         |
|       6 | 01000400                         | 010007FF                         |
+---------+----------------------------------+----------------------------------+
6 rows in set (0.00 sec)

mysql> select geoIPID, INET6_NTOA(ipfrom), INET6_NTOA(ipto) from ipv6;
+---------+--------------------+----------------------------------------+
| geoIPID | INET6_NTOA(ipfrom) | INET6_NTOA(ipto)                       |
+---------+--------------------+----------------------------------------+
|       1 | 2001:200::         | 2001:200:ffff:ffff:ffff:ffff:ffff:ffff |
|       2 | 2001:208::         | 2001:208:ffff:ffff:ffff:ffff:ffff:ffff |
|       3 | 2001:218::         | 2001:218:ffff:ffff:ffff:ffff:ffff:ffff |
|       4 | 1.0.0.0            | 1.0.0.255                              |
|       5 | 1.0.1.0            | 1.0.3.255                              |
|       6 | 1.0.4.0            | 1.0.7.255                              |
+---------+--------------------+----------------------------------------+
6 rows in set (0.00 sec)