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129 lines
3.8 KiB
Markdown
129 lines
3.8 KiB
Markdown
# MySQL {#mysql}
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Permite conectarse a bases de datos en un servidor MySQL remoto y realizar `INSERT` y `SELECT` consultas para intercambiar datos entre ClickHouse y MySQL.
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El `MySQL` motor de base de datos traducir consultas al servidor MySQL para que pueda realizar operaciones tales como `SHOW TABLES` o `SHOW CREATE TABLE`.
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No puede realizar las siguientes consultas:
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- `RENAME`
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- `CREATE TABLE`
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- `ALTER`
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## Creación de una base de datos {#creating-a-database}
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``` sql
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CREATE DATABASE [IF NOT EXISTS] db_name [ON CLUSTER cluster]
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ENGINE = MySQL('host:port', 'database', 'user', 'password')
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```
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**Parámetros del motor**
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- `host:port` — Dirección del servidor MySQL.
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- `database` — Nombre de base de datos remota.
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- `user` — Usuario de MySQL.
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- `password` — Contraseña de usuario.
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## Soporte de tipos de datos {#data-types-support}
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| MySQL | Haga clic en Casa |
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|-----------------------------------|---------------------------------------------|
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| TINYINT NO FIRMADO | [UInt8](../data_types/int_uint.md) |
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| TINYINT | [Int8](../data_types/int_uint.md) |
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| SMALLINT UNSIGNED | [UInt16](../data_types/int_uint.md) |
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| SMALLINT | [Int16](../data_types/int_uint.md) |
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| UNFIRED INT, MEDIUMINT NO FIRMADO | [UInt32](../data_types/int_uint.md) |
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| INT, MEDIUMINT | [Int32](../data_types/int_uint.md) |
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| BIGINT NO FIRMADO | [UInt64](../data_types/int_uint.md) |
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| BIGINT | [Int64](../data_types/int_uint.md) |
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| FLOTANTE | [Float32](../data_types/float.md) |
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| DOBLE | [Float64](../data_types/float.md) |
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| FECHA | [Fecha](../data_types/date.md) |
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| DATETIME, TIMESTAMP | [FechaHora](../data_types/datetime.md) |
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| BINARIO | [Cadena fija](../data_types/fixedstring.md) |
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Todos los demás tipos de datos MySQL se convierten en [Cadena](../data_types/string.md).
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[NULL](../data_types/nullable.md) se admite.
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## Ejemplos de uso {#examples-of-use}
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Tabla en MySQL:
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``` text
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mysql> USE test;
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Database changed
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mysql> CREATE TABLE `mysql_table` (
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-> `int_id` INT NOT NULL AUTO_INCREMENT,
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-> `float` FLOAT NOT NULL,
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-> PRIMARY KEY (`int_id`));
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Query OK, 0 rows affected (0,09 sec)
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mysql> insert into mysql_table (`int_id`, `float`) VALUES (1,2);
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Query OK, 1 row affected (0,00 sec)
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mysql> select * from mysql_table;
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+--------+-------+
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| int_id | value |
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+--------+-------+
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| 1 | 2 |
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+--------+-------+
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1 row in set (0,00 sec)
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```
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Base de datos en ClickHouse, intercambiando datos con el servidor MySQL:
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``` sql
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CREATE DATABASE mysql_db ENGINE = MySQL('localhost:3306', 'test', 'my_user', 'user_password')
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```
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``` sql
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SHOW DATABASES
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```
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``` text
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┌─name─────┐
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│ default │
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│ mysql_db │
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│ system │
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└──────────┘
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```
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``` sql
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SHOW TABLES FROM mysql_db
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```
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``` text
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┌─name─────────┐
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│ mysql_table │
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└──────────────┘
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```
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``` sql
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SELECT * FROM mysql_db.mysql_table
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```
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``` text
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┌─int_id─┬─value─┐
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│ 1 │ 2 │
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└────────┴───────┘
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```
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``` sql
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INSERT INTO mysql_db.mysql_table VALUES (3,4)
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```
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``` sql
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SELECT * FROM mysql_db.mysql_table
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```
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``` text
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┌─int_id─┬─value─┐
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│ 1 │ 2 │
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│ 3 │ 4 │
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└────────┴───────┘
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```
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[Artículo Original](https://clickhouse.tech/docs/es/database_engines/mysql/) <!--hide-->
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