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IPv4

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IPv4

IPv4 地址。以 4 字节的 UInt32 存储。

基本用法

CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY url;

DESCRIBE TABLE hits;
┌─name─┬─type───┬─default_type─┬─default_expression─┬─comment─┬─codec_expression─┐
│ url  │ String │              │                    │         │                  │
│ from │ IPv4   │              │                    │         │                  │
└──────┴────────┴──────────────┴────────────────────┴─────────┴──────────────────┘

或者，也可以使用 IPv4 域作为键：

CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY from;

IPv4 域支持将 IPv4 字符串用作自定义输入格式：

INSERT INTO hits (url, from) VALUES ('https://wikipedia.org', '116.253.40.133')('https://clickhouse.com', '183.247.232.58')('https://clickhouse.com/docs/en/', '116.106.34.242');

SELECT * FROM hits;
┌─url────────────────────────────────┬───────────from─┐
│ https://clickhouse.com/docs/en/ │ 116.106.34.242 │
│ https://wikipedia.org              │ 116.253.40.133 │
│ https://clickhouse.com          │ 183.247.232.58 │
└────────────────────────────────────┴────────────────┘

值以紧凑的二进制格式存储：

SELECT toTypeName(from), hex(from) FROM hits LIMIT 1;
┌─toTypeName(from)─┬─hex(from)─┐
│ IPv4             │ B7F7E83A  │
└──────────────────┴───────────┘

IPv4 地址可以直接与 IPv6 地址进行比较：

SELECT toIPv4('127.0.0.1') = toIPv6('::ffff:127.0.0.1');
┌─equals(toIPv4('127.0.0.1'), toIPv6('::ffff:127.0.0.1'))─┐
│                                                       1 │
└─────────────────────────────────────────────────────────┘

另请参阅

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