mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-06 07:32:27 +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
83 lines
2.6 KiB
Markdown
83 lines
2.6 KiB
Markdown
---
|
|
machine_translated: true
|
|
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
|
|
toc_priority: 41
|
|
toc_title: URL
|
|
---
|
|
|
|
# URL(URL, Formato) {#table_engines-url}
|
|
|
|
Administra datos en un servidor HTTP/HTTPS remoto. Este motor es similar
|
|
a la [File](file.md) motor.
|
|
|
|
## Uso del motor en el servidor ClickHouse {#using-the-engine-in-the-clickhouse-server}
|
|
|
|
El `format` debe ser uno que ClickHouse pueda usar en
|
|
`SELECT` consultas y, si es necesario, en `INSERTs`. Para obtener la lista completa de formatos admitidos, consulte
|
|
[Formato](../../../interfaces/formats.md#formats).
|
|
|
|
El `URL` debe ajustarse a la estructura de un localizador uniforme de recursos. La dirección URL especificada debe apuntar a un servidor
|
|
que utiliza HTTP o HTTPS. Esto no requiere ningún
|
|
encabezados adicionales para obtener una respuesta del servidor.
|
|
|
|
`INSERT` y `SELECT` las consultas se transforman en `POST` y `GET` peticiones,
|
|
respectivamente. Para el procesamiento `POST` solicitudes, el servidor remoto debe admitir
|
|
[Codificación de transferencia fragmentada](https://en.wikipedia.org/wiki/Chunked_transfer_encoding).
|
|
|
|
Puede limitar el número máximo de saltos de redirección HTTP GET utilizando el [Nombre de la red inalámbrica (SSID):](../../../operations/settings/settings.md#setting-max_http_get_redirects) configuración.
|
|
|
|
**Ejemplo:**
|
|
|
|
**1.** Crear un `url_engine_table` tabla en el servidor :
|
|
|
|
``` sql
|
|
CREATE TABLE url_engine_table (word String, value UInt64)
|
|
ENGINE=URL('http://127.0.0.1:12345/', CSV)
|
|
```
|
|
|
|
**2.** Cree un servidor HTTP básico utilizando las herramientas estándar de Python 3 y
|
|
comenzarlo:
|
|
|
|
``` python3
|
|
from http.server import BaseHTTPRequestHandler, HTTPServer
|
|
|
|
class CSVHTTPServer(BaseHTTPRequestHandler):
|
|
def do_GET(self):
|
|
self.send_response(200)
|
|
self.send_header('Content-type', 'text/csv')
|
|
self.end_headers()
|
|
|
|
self.wfile.write(bytes('Hello,1\nWorld,2\n', "utf-8"))
|
|
|
|
if __name__ == "__main__":
|
|
server_address = ('127.0.0.1', 12345)
|
|
HTTPServer(server_address, CSVHTTPServer).serve_forever()
|
|
```
|
|
|
|
``` bash
|
|
$ python3 server.py
|
|
```
|
|
|
|
**3.** Solicitar datos:
|
|
|
|
``` sql
|
|
SELECT * FROM url_engine_table
|
|
```
|
|
|
|
``` text
|
|
┌─word──┬─value─┐
|
|
│ Hello │ 1 │
|
|
│ World │ 2 │
|
|
└───────┴───────┘
|
|
```
|
|
|
|
## Detalles de la implementación {#details-of-implementation}
|
|
|
|
- Las lecturas y escrituras pueden ser paralelas
|
|
- No soportado:
|
|
- `ALTER` y `SELECT...SAMPLE` operación.
|
|
- Índices.
|
|
- Replicación.
|
|
|
|
[Artículo Original](https://clickhouse.tech/docs/en/operations/table_engines/url/) <!--hide-->
|