mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-17 22:10:54 +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
87 lines
3.1 KiB
Markdown
87 lines
3.1 KiB
Markdown
---
|
||
machine_translated: true
|
||
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
|
||
toc_priority: 42
|
||
toc_title: mysql
|
||
---
|
||
|
||
# mysql {#mysql}
|
||
|
||
Permitir `SELECT` consultas que se realizarán en los datos que se almacenan en un servidor MySQL remoto.
|
||
|
||
``` sql
|
||
mysql('host:port', 'database', 'table', 'user', 'password'[, replace_query, 'on_duplicate_clause']);
|
||
```
|
||
|
||
**Parámetros**
|
||
|
||
- `host:port` — MySQL server address.
|
||
|
||
- `database` — Remote database name.
|
||
|
||
- `table` — Remote table name.
|
||
|
||
- `user` — MySQL user.
|
||
|
||
- `password` — User password.
|
||
|
||
- `replace_query` — Flag that converts `INSERT INTO` consultas a `REPLACE INTO`. Si `replace_query=1`, la consulta se reemplaza.
|
||
|
||
- `on_duplicate_clause` — The `ON DUPLICATE KEY on_duplicate_clause` expresión que se añade a la `INSERT` consulta.
|
||
|
||
Example: `INSERT INTO t (c1,c2) VALUES ('a', 2) ON DUPLICATE KEY UPDATE c2 = c2 + 1`, where `on_duplicate_clause` is `UPDATE c2 = c2 + 1`. See the MySQL documentation to find which `on_duplicate_clause` you can use with the `ON DUPLICATE KEY` clause.
|
||
|
||
To specify `on_duplicate_clause` you need to pass `0` to the `replace_query` parameter. If you simultaneously pass `replace_query = 1` and `on_duplicate_clause`, ClickHouse generates an exception.
|
||
|
||
Simple `WHERE` cláusulas tales como `=, !=, >, >=, <, <=` se ejecutan actualmente en el servidor MySQL.
|
||
|
||
El resto de las condiciones y el `LIMIT` La restricción de muestreo se ejecuta en ClickHouse solo después de que finalice la consulta a MySQL.
|
||
|
||
**Valor devuelto**
|
||
|
||
Un objeto de tabla con las mismas columnas que la tabla MySQL original.
|
||
|
||
## Ejemplo de uso {#usage-example}
|
||
|
||
Tabla en MySQL:
|
||
|
||
``` 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)
|
||
```
|
||
|
||
Selección de datos de ClickHouse:
|
||
|
||
``` sql
|
||
SELECT * FROM mysql('localhost:3306', 'test', 'test', 'bayonet', '123')
|
||
```
|
||
|
||
``` text
|
||
┌─int_id─┬─int_nullable─┬─float─┬─float_nullable─┐
|
||
│ 1 │ ᴺᵁᴸᴸ │ 2 │ ᴺᵁᴸᴸ │
|
||
└────────┴──────────────┴───────┴────────────────┘
|
||
```
|
||
|
||
## Ver también {#see-also}
|
||
|
||
- [El ‘MySQL’ motor de mesa](../../engines/table-engines/integrations/mysql.md)
|
||
- [Uso de MySQL como fuente de diccionario externo](../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-sources.md#dicts-external_dicts_dict_sources-mysql)
|
||
|
||
[Artículo Original](https://clickhouse.tech/docs/en/query_language/table_functions/mysql/) <!--hide-->
|