diff --git a/docs/zh/database_engines/index.md b/docs/zh/database_engines/index.md deleted file mode 120000 index bbdb762a4ad..00000000000 --- a/docs/zh/database_engines/index.md +++ /dev/null @@ -1 +0,0 @@ -../../en/database_engines/index.md \ No newline at end of file diff --git a/docs/zh/database_engines/index.md b/docs/zh/database_engines/index.md new file mode 100644 index 00000000000..f8ae05e2520 --- /dev/null +++ b/docs/zh/database_engines/index.md @@ -0,0 +1,11 @@ +# 数据库引擎 + +您使用的所有表都是由数据库引擎所提供的 + +默认情况下,ClickHouse使用自己的数据库引擎,该引擎提供可配置的[表引擎](../operations/table_engines/index.md)和[所有支持的SQL语法](../query_language/syntax.md). + +除此之外,您还可以选择使用以下的数据库引擎: + +- [MySQL](mysql.md) + +[来源文章](https://clickhouse.yandex/docs/en/database_engines/) diff --git a/docs/zh/database_engines/mysql.md b/docs/zh/database_engines/mysql.md deleted file mode 120000 index 51ac4126e2d..00000000000 --- a/docs/zh/database_engines/mysql.md +++ /dev/null @@ -1 +0,0 @@ -../../en/database_engines/mysql.md \ No newline at end of file diff --git a/docs/zh/database_engines/mysql.md b/docs/zh/database_engines/mysql.md new file mode 100644 index 00000000000..38dfcb5ef64 --- /dev/null +++ b/docs/zh/database_engines/mysql.md @@ -0,0 +1,124 @@ +# MySQL + +MySQL引擎用于将远程的MySQL服务器中的表映射到ClickHouse中,并允许您对表进行`INSERT`和`SELECT`查询,以方便您在ClickHouse与MySQL之间进行数据交换。 + +`MySQL`数据库引擎会将对其的查询转换为MySQL语法并发送到MySQL服务器中,因此您可以执行诸如`SHOW TABLES`或`SHOW CREATE TABLE`之类的操作。 + +但您无法对其执行以下操作: + +- `ATTACH`/`DETACH` +- `DROP` +- `RENAME` +- `CREATE TABLE` +- `ALTER` + + +## CREATE DATABASE + +``` sql +CREATE DATABASE [IF NOT EXISTS] db_name [ON CLUSTER cluster] +ENGINE = MySQL('host:port', 'database', 'user', 'password') +``` + +**MySQL数据库引擎参数** + +- `host:port` — 链接的MySQL地址。 +- `database` — 链接的MySQL数据库。 +- `user` — 链接的MySQL用户。 +- `password` — 链接的MySQL用户密码。 + + +## 支持的类型对应 + +MySQL | ClickHouse +------|------------ +UNSIGNED TINYINT | [UInt8](../data_types/int_uint.md) +TINYINT | [Int8](../data_types/int_uint.md) +UNSIGNED SMALLINT | [UInt16](../data_types/int_uint.md) +SMALLINT | [Int16](../data_types/int_uint.md) +UNSIGNED INT, UNSIGNED MEDIUMINT | [UInt32](../data_types/int_uint.md) +INT, MEDIUMINT | [Int32](../data_types/int_uint.md) +UNSIGNED BIGINT | [UInt64](../data_types/int_uint.md) +BIGINT | [Int64](../data_types/int_uint.md) +FLOAT | [Float32](../data_types/float.md) +DOUBLE | [Float64](../data_types/float.md) +DATE | [Date](../data_types/date.md) +DATETIME, TIMESTAMP | [DateTime](../data_types/datetime.md) +BINARY | [FixedString](../data_types/fixedstring.md) + +其他的MySQL数据类型将全部都转换为[String](../data_types/string.md)。 + +同时以上的所有类型都支持[Nullable](../data_types/nullable.md)。 + + +## 使用示例 + +在MySQL中创建表: + +``` +mysql> USE test; +Database changed + +mysql> CREATE TABLE `mysql_table` ( + -> `int_id` INT NOT NULL AUTO_INCREMENT, + -> `float` FLOAT NOT NULL, + -> PRIMARY KEY (`int_id`)); +Query OK, 0 rows affected (0,09 sec) + +mysql> insert into mysql_table (`int_id`, `float`) VALUES (1,2); +Query OK, 1 row affected (0,00 sec) + +mysql> select * from mysql_table; ++--------+-------+ +| int_id | value | ++--------+-------+ +| 1 | 2 | ++--------+-------+ +1 row in set (0,00 sec) +``` + +在ClickHouse中创建MySQL类型的数据库,同时与MySQL服务器交换数据: + +```sql +CREATE DATABASE mysql_db ENGINE = MySQL('localhost:3306', 'test', 'my_user', 'user_password') +``` +```sql +SHOW DATABASES +``` +```text +┌─name─────┐ +│ default │ +│ mysql_db │ +│ system │ +└──────────┘ +``` +```sql +SHOW TABLES FROM mysql_db +``` +```text +┌─name─────────┐ +│ mysql_table │ +└──────────────┘ +``` +```sql +SELECT * FROM mysql_db.mysql_table +``` +```text +┌─int_id─┬─value─┐ +│ 1 │ 2 │ +└────────┴───────┘ +``` +```sql +INSERT INTO mysql_db.mysql_table VALUES (3,4) +``` +```sql +SELECT * FROM mysql_db.mysql_table +``` +```text +┌─int_id─┬─value─┐ +│ 1 │ 2 │ +│ 3 │ 4 │ +└────────┴───────┘ +``` + +[来源文章](https://clickhouse.yandex/docs/en/database_engines/mysql/)