mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-26 09:32:01 +00:00
f315e5079b
* 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) * Links to nowhere check at least for English * use f string * More complete es translation
84 lines
2.7 KiB
Markdown
84 lines
2.7 KiB
Markdown
# JDBC {#table-engine-jdbc}
|
|
|
|
Permite que ClickHouse se conecte a bases de datos externas a través de [JDBC](https://en.wikipedia.org/wiki/Java_Database_Connectivity).
|
|
|
|
Para implementar la conexión JDBC, ClickHouse utiliza el programa independiente [Sistema abierto.](https://github.com/alex-krash/clickhouse-jdbc-bridge) que debería ejecutarse como un demonio.
|
|
|
|
Este motor soporta el [NULO](../../data_types/nullable.md) tipo de datos.
|
|
|
|
## Creación de una tabla {#creating-a-table}
|
|
|
|
``` sql
|
|
CREATE TABLE [IF NOT EXISTS] [db.]table_name
|
|
(
|
|
columns list...
|
|
)
|
|
ENGINE = JDBC(dbms_uri, external_database, external_table)
|
|
```
|
|
|
|
**Parámetros del motor**
|
|
|
|
- `dbms_uri` — URI de un DBMS externo.
|
|
|
|
Formato: `jdbc:<driver_name>://<host_name>:<port>/?user=<username>&password=<password>`.
|
|
Ejemplo para MySQL: `jdbc:mysql://localhost:3306/?user=root&password=root`.
|
|
|
|
- `external_database` — Base de datos en un DBMS externo.
|
|
|
|
- `external_table` — Nombre de la tabla en `external_database`.
|
|
|
|
## Ejemplo de uso {#usage-example}
|
|
|
|
Creación de una tabla en el servidor MySQL mediante la conexión directa con su cliente de consola:
|
|
|
|
``` text
|
|
mysql> CREATE TABLE `test`.`test` (
|
|
-> `int_id` INT NOT NULL AUTO_INCREMENT,
|
|
-> `int_nullable` INT NULL DEFAULT NULL,
|
|
-> `float` FLOAT NOT NULL,
|
|
-> `float_nullable` FLOAT NULL DEFAULT NULL,
|
|
-> PRIMARY KEY (`int_id`));
|
|
Query OK, 0 rows affected (0,09 sec)
|
|
|
|
mysql> insert into test (`int_id`, `float`) VALUES (1,2);
|
|
Query OK, 1 row affected (0,00 sec)
|
|
|
|
mysql> select * from test;
|
|
+--------+--------------+-------+----------------+
|
|
| int_id | int_nullable | float | float_nullable |
|
|
+--------+--------------+-------+----------------+
|
|
| 1 | NULL | 2 | NULL |
|
|
+--------+--------------+-------+----------------+
|
|
1 row in set (0,00 sec)
|
|
```
|
|
|
|
Creación de una tabla en el servidor ClickHouse y selección de datos de ella:
|
|
|
|
``` sql
|
|
CREATE TABLE jdbc_table
|
|
(
|
|
`int_id` Int32,
|
|
`int_nullable` Nullable(Int32),
|
|
`float` Float32,
|
|
`float_nullable` Nullable(Float32)
|
|
)
|
|
ENGINE JDBC('jdbc:mysql://localhost:3306/?user=root&password=root', 'test', 'test')
|
|
```
|
|
|
|
``` sql
|
|
SELECT *
|
|
FROM jdbc_table
|
|
```
|
|
|
|
``` text
|
|
┌─int_id─┬─int_nullable─┬─float─┬─float_nullable─┐
|
|
│ 1 │ ᴺᵁᴸᴸ │ 2 │ ᴺᵁᴸᴸ │
|
|
└────────┴──────────────┴───────┴────────────────┘
|
|
```
|
|
|
|
## Ver también {#see-also}
|
|
|
|
- [Función de la tabla de JDBC](../../query_language/table_functions/jdbc.md).
|
|
|
|
[Artículo Original](https://clickhouse.tech/docs/es/operations/table_engines/jdbc/) <!--hide-->
|