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* replace exit with assert in test_single_page * improve save_raw_single_page docs option * More grammar fixes * "Built from" link in new tab * fix mistype * Example of include in docs * add anchor to meeting form * Draft of translation helper * WIP on translation helper * Replace some fa docs content with machine translation * add normalize-en-markdown.sh * normalize some en markdown * normalize some en markdown * admonition support * normalize * normalize * normalize * support wide tables * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * normalize * lightly edited machine translation of introdpection.md * lightly edited machhine translation of lazy.md * WIP on translation utils * Normalize ru docs * Normalize other languages * some fixes * WIP on normalize/translate tools * add requirements.txt * [experimental] add es docs language as machine translated draft * remove duplicate script * Back to wider tab-stop (narrow renders not so well)
3.0 KiB
3.0 KiB
UUID函数
下面列出了所有UUID的相关函数
generateUUIDv4
生成一个UUID（版本4）。
generateUUIDv4()
返回值
UUID类型的值。
使用示例
此示例演示如何在表中创建UUID类型的列，并对其写入数据。
:) CREATE TABLE t_uuid (x UUID) ENGINE=TinyLog
:) INSERT INTO t_uuid SELECT generateUUIDv4()
:) SELECT * FROM t_uuid
┌────────────────────────────────────x─┐
│ f4bf890f-f9dc-4332-ad5c-0c18e73f28e9 │
└──────────────────────────────────────┘
toUUID (x)
将String类型的值转换为UUID类型的值。
toUUID(String)
返回值
UUID类型的值
使用示例
:) SELECT toUUID('61f0c404-5cb3-11e7-907b-a6006ad3dba0') AS uuid
┌─────────────────────────────────uuid─┐
│ 61f0c404-5cb3-11e7-907b-a6006ad3dba0 │
└──────────────────────────────────────┘
UUIDStringToNum
接受一个String类型的值，其中包含36个字符且格式为xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx，将其转换为UUID的数值并以FixedString(16)将其返回。
UUIDStringToNum(String)
返回值
FixedString(16)
使用示例
:) SELECT
'612f3c40-5d3b-217e-707b-6a546a3d7b29' AS uuid,
UUIDStringToNum(uuid) AS bytes
┌─uuid─────────────────────────────────┬─bytes────────────┐
│ 612f3c40-5d3b-217e-707b-6a546a3d7b29 │ a/<@];!~p{jTj={) │
└──────────────────────────────────────┴──────────────────┘
UUIDNumToString
接受一个FixedString(16)类型的值，返回其对应的String表现形式。
UUIDNumToString(FixedString(16))
返回值
String.
使用示例
SELECT
'a/<@];!~p{jTj={)' AS bytes,
UUIDNumToString(toFixedString(bytes, 16)) AS uuid
┌─bytes────────────┬─uuid─────────────────────────────────┐
│ a/<@];!~p{jTj={) │ 612f3c40-5d3b-217e-707b-6a546a3d7b29 │
└──────────────────┴──────────────────────────────────────┘