2019-07-26 01:36:11 +00:00
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## IPv4
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`IPv4` 是基于 `UInt32` 的domain类型,用来存储IPv4地址。它使用紧凑的存储方式,提供用户友好的输入输出格式,
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自动检查列类型。
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### Basic Usage
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``` sql
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CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY url;
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DESCRIBE TABLE hits;
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```
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```
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┌─name─┬─type───┬─default_type─┬─default_expression─┬─comment─┬─codec_expression─┐
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│ url │ String │ │ │ │ │
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│ from │ IPv4 │ │ │ │ │
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└──────┴────────┴──────────────┴────────────────────┴─────────┴──────────────────┘
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```
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或者你可以使用IPv4 domain作主键:
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``` sql
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CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY from;
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```
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`IPv4` domain支持定制化的IPv4地址字符串格式:
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``` sql
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INSERT INTO hits (url, from) VALUES ('https://wikipedia.org', '116.253.40.133')('https://clickhouse.yandex', '183.247.232.58')('https://clickhouse.yandex/docs/en/', '116.106.34.242');
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SELECT * FROM hits;
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```
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```
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┌─url────────────────────────────────┬───────────from─┐
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│ https://clickhouse.yandex/docs/en/ │ 116.106.34.242 │
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│ https://wikipedia.org │ 116.253.40.133 │
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│ https://clickhouse.yandex │ 183.247.232.58 │
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└────────────────────────────────────┴────────────────┘
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```
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数据值以紧凑的二进制格式存储:
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``` sql
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SELECT toTypeName(from), hex(from) FROM hits LIMIT 1;
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```
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```
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┌─toTypeName(from)─┬─hex(from)─┐
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│ IPv4 │ B7F7E83A │
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└──────────────────┴───────────┘
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```
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Domain不可隐式转换为除`UInt32`以外的类型。如果要将IPv4值转换为字符串,则必须使用`IPv4NumToString()`函数显示的进行此操作。
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``` sql
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SELECT toTypeName(s), IPv4NumToString(from) as s FROM hits LIMIT 1;
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```
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```
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┌─toTypeName(IPv4NumToString(from))─┬─s──────────────┐
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│ String │ 183.247.232.58 │
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└───────────────────────────────────┴────────────────┘
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```
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或转换为 `UInt32` 类型:
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``` sql
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SELECT toTypeName(i), CAST(from as UInt32) as i FROM hits LIMIT 1;
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```
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```
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┌─toTypeName(CAST(from, 'UInt32'))─┬──────────i─┐
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│ UInt32 │ 3086477370 │
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└──────────────────────────────────┴────────────┘
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```
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[Original article](https://clickhouse.yandex/docs/en/data_types/domains/ipv4) <!--hide-->
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