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123 lines
3.5 KiB
Markdown
123 lines
3.5 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_priority: 53
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toc_title: Travailler avec UUID
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---
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# Fonctions pour travailler avec UUID {#functions-for-working-with-uuid}
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Les fonctions pour travailler avec UUID sont listées ci-dessous.
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## generateUUIDv4 {#uuid-function-generate}
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Génère le [UUID](../../sql-reference/data-types/uuid.md) de [la version 4](https://tools.ietf.org/html/rfc4122#section-4.4).
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``` sql
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generateUUIDv4()
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```
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**Valeur renvoyée**
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La valeur de type UUID.
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**Exemple d'utilisation**
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Cet exemple montre la création d'une table avec la colonne de type UUID et l'insertion d'une valeur dans la table.
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``` sql
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CREATE TABLE t_uuid (x UUID) ENGINE=TinyLog
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INSERT INTO t_uuid SELECT generateUUIDv4()
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SELECT * FROM t_uuid
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```
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``` text
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┌────────────────────────────────────x─┐
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│ f4bf890f-f9dc-4332-ad5c-0c18e73f28e9 │
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└──────────────────────────────────────┘
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```
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## toUUID (x) {#touuid-x}
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Convertit la valeur de type de chaîne en type UUID.
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``` sql
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toUUID(String)
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```
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**Valeur renvoyée**
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La valeur de type UUID.
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**Exemple d'utilisation**
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``` sql
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SELECT toUUID('61f0c404-5cb3-11e7-907b-a6006ad3dba0') AS uuid
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```
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``` text
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┌─────────────────────────────────uuid─┐
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│ 61f0c404-5cb3-11e7-907b-a6006ad3dba0 │
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└──────────────────────────────────────┘
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```
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## UUIDStringToNum {#uuidstringtonum}
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Accepte une chaîne contenant 36 caractères dans le format `xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`, et le renvoie comme un ensemble d'octets dans un [FixedString (16)](../../sql-reference/data-types/fixedstring.md).
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``` sql
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UUIDStringToNum(String)
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```
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**Valeur renvoyée**
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FixedString (16)
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**Exemples d'utilisation**
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``` sql
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SELECT
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'612f3c40-5d3b-217e-707b-6a546a3d7b29' AS uuid,
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UUIDStringToNum(uuid) AS bytes
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```
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``` text
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┌─uuid─────────────────────────────────┬─bytes────────────┐
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│ 612f3c40-5d3b-217e-707b-6a546a3d7b29 │ a/<@];!~p{jTj={) │
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└──────────────────────────────────────┴──────────────────┘
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```
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## UUIDNumToString {#uuidnumtostring}
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Accepte un [FixedString (16)](../../sql-reference/data-types/fixedstring.md) valeur, et renvoie une chaîne contenant 36 caractères au format texte.
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``` sql
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UUIDNumToString(FixedString(16))
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```
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**Valeur renvoyée**
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Chaîne.
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**Exemple d'utilisation**
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``` sql
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SELECT
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'a/<@];!~p{jTj={)' AS bytes,
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UUIDNumToString(toFixedString(bytes, 16)) AS uuid
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```
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``` text
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┌─bytes────────────┬─uuid─────────────────────────────────┐
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│ a/<@];!~p{jTj={) │ 612f3c40-5d3b-217e-707b-6a546a3d7b29 │
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└──────────────────┴──────────────────────────────────────┘
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```
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## Voir Aussi {#see-also}
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- [dictGetUUID](ext-dict-functions.md#ext_dict_functions-other)
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[Article Original](https://clickhouse.tech/docs/en/query_language/functions/uuid_function/) <!--hide-->
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