mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-21 07:50:49 +00:00
Symbolic link
80 lines
3.1 KiB
Markdown
Symbolic link
80 lines
3.1 KiB
Markdown
## IPv4
|
||
|
||
`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，
|
||
自动检查列类型。
|
||
|
||
### Basic Usage
|
||
|
||
``` sql
|
||
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 │ │ │ │ │
|
||
└──────┴────────┴──────────────┴────────────────────┴─────────┴──────────────────┘
|
||
```
|
||
|
||
或者你可以使用IPv4 domain作主键：
|
||
|
||
``` sql
|
||
CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY from;
|
||
```
|
||
|
||
`IPv4` domain支持定制化的IPv4地址字符串格式:
|
||
|
||
``` sql
|
||
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');
|
||
|
||
SELECT * FROM hits;
|
||
```
|
||
|
||
```
|
||
┌─url────────────────────────────────┬───────────from─┐
|
||
│ https://clickhouse.yandex/docs/en/ │ 116.106.34.242 │
|
||
│ https://wikipedia.org │ 116.253.40.133 │
|
||
│ https://clickhouse.yandex │ 183.247.232.58 │
|
||
└────────────────────────────────────┴────────────────┘
|
||
```
|
||
|
||
数据值以紧凑的二进制格式存储:
|
||
|
||
``` sql
|
||
SELECT toTypeName(from), hex(from) FROM hits LIMIT 1;
|
||
```
|
||
|
||
```
|
||
┌─toTypeName(from)─┬─hex(from)─┐
|
||
│ IPv4 │ B7F7E83A │
|
||
└──────────────────┴───────────┘
|
||
```
|
||
|
||
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。
|
||
|
||
``` sql
|
||
SELECT toTypeName(s), IPv4NumToString(from) as s FROM hits LIMIT 1;
|
||
```
|
||
|
||
```
|
||
┌─toTypeName(IPv4NumToString(from))─┬─s──────────────┐
|
||
│ String │ 183.247.232.58 │
|
||
└───────────────────────────────────┴────────────────┘
|
||
```
|
||
|
||
或转换为 `UInt32` 类型:
|
||
|
||
``` sql
|
||
SELECT toTypeName(i), CAST(from as UInt32) as i FROM hits LIMIT 1;
|
||
```
|
||
|
||
```
|
||
┌─toTypeName(CAST(from, 'UInt32'))─┬──────────i─┐
|
||
│ UInt32 │ 3086477370 │
|
||
└──────────────────────────────────┴────────────┘
|
||
```
|
||
|
||
[Original article](https://clickhouse.yandex/docs/en/data_types/domains/ipv4) <!--hide-->
|