mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-19 14:11:58 +00:00
cd14f9ebcb
* split up select.md * array-join.md basic refactoring * distinct.md basic refactoring * format.md basic refactoring * from.md basic refactoring * group-by.md basic refactoring * having.md basic refactoring * additional index.md refactoring * into-outfile.md basic refactoring * join.md basic refactoring * limit.md basic refactoring * limit-by.md basic refactoring * order-by.md basic refactoring * prewhere.md basic refactoring * adjust operators/index.md links * adjust sample.md links * adjust more links * adjust operatots links * fix some links * adjust aggregate function article titles * basic refactor of remaining select clauses * absolute paths in make_links.sh * run make_links.sh * remove old select.md locations * translate docs/es * translate docs/fr * translate docs/fa * remove old operators.md location * change operators.md links * adjust links in docs/es * adjust links in docs/es * minor texts adjustments * wip * update machine translations to use new links * fix changelog * es build fixes * get rid of some select.md links * temporary adjust ru links * temporary adjust more ru links * improve curly brace handling * adjust ru as well * fa build fix * ru link fixes * zh link fixes * temporary disable part of anchor checks
98 lines
3.1 KiB
Markdown
98 lines
3.1 KiB
Markdown
---
|
|
machine_translated: true
|
|
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
|
|
toc_priority: 35
|
|
toc_title: Dictionnaire
|
|
---
|
|
|
|
# Dictionnaire {#dictionary}
|
|
|
|
Le `Dictionary` le moteur affiche le [dictionnaire](../../../sql-reference/dictionaries/external-dictionaries/external-dicts.md) données comme une table ClickHouse.
|
|
|
|
À titre d'exemple, considérons un dictionnaire de `products` avec la configuration suivante:
|
|
|
|
``` xml
|
|
<dictionaries>
|
|
<dictionary>
|
|
<name>products</name>
|
|
<source>
|
|
<odbc>
|
|
<table>products</table>
|
|
<connection_string>DSN=some-db-server</connection_string>
|
|
</odbc>
|
|
</source>
|
|
<lifetime>
|
|
<min>300</min>
|
|
<max>360</max>
|
|
</lifetime>
|
|
<layout>
|
|
<flat/>
|
|
</layout>
|
|
<structure>
|
|
<id>
|
|
<name>product_id</name>
|
|
</id>
|
|
<attribute>
|
|
<name>title</name>
|
|
<type>String</type>
|
|
<null_value></null_value>
|
|
</attribute>
|
|
</structure>
|
|
</dictionary>
|
|
</dictionaries>
|
|
```
|
|
|
|
Interroger les données du dictionnaire:
|
|
|
|
``` sql
|
|
SELECT
|
|
name,
|
|
type,
|
|
key,
|
|
attribute.names,
|
|
attribute.types,
|
|
bytes_allocated,
|
|
element_count,
|
|
source
|
|
FROM system.dictionaries
|
|
WHERE name = 'products'
|
|
```
|
|
|
|
``` text
|
|
┌─name─────┬─type─┬─key────┬─attribute.names─┬─attribute.types─┬─bytes_allocated─┬─element_count─┬─source──────────┐
|
|
│ products │ Flat │ UInt64 │ ['title'] │ ['String'] │ 23065376 │ 175032 │ ODBC: .products │
|
|
└──────────┴──────┴────────┴─────────────────┴─────────────────┴─────────────────┴───────────────┴─────────────────┘
|
|
```
|
|
|
|
Vous pouvez utiliser l' [dictGet\*](../../../sql-reference/functions/ext-dict-functions.md#ext_dict_functions) fonction pour obtenir les données du dictionnaire dans ce format.
|
|
|
|
Cette vue n'est pas utile lorsque vous avez besoin d'obtenir des données brutes ou `JOIN` opération. Pour ces cas, vous pouvez utiliser le `Dictionary` moteur, qui affiche les données du dictionnaire dans une table.
|
|
|
|
Syntaxe:
|
|
|
|
``` sql
|
|
CREATE TABLE %table_name% (%fields%) engine = Dictionary(%dictionary_name%)`
|
|
```
|
|
|
|
Exemple d'utilisation:
|
|
|
|
``` sql
|
|
create table products (product_id UInt64, title String) Engine = Dictionary(products);
|
|
```
|
|
|
|
Ok
|
|
|
|
Jetez un oeil à ce qui est dans le tableau.
|
|
|
|
``` sql
|
|
select * from products limit 1;
|
|
```
|
|
|
|
``` text
|
|
┌────product_id─┬─title───────────┐
|
|
│ 152689 │ Some item │
|
|
└───────────────┴─────────────────┘
|
|
```
|
|
|
|
[Article Original](https://clickhouse.tech/docs/en/operations/table_engines/dictionary/) <!--hide-->
|