ClickHouse/docs/ja/engines/table-engines/integrations/jdbc.md
Ivan Blinkov cd14f9ebcb
SQL reference refactoring (#10857)
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* remove old select.md locations

* translate docs/es

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2020-05-15 07:34:54 +03:00

2.8 KiB

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true 72537a2d52 34 JDBC

JDBC

ClickHouseが外部データベースに接続できるようにする JDBC.

JDBC接続を実装するには、ClickHouseは別のプログラムを使用します clickhouse-jdbc-bridge うにしてくれました。

このエンジンは Null可能 データ型。

テーブルの作成

CREATE TABLE [IF NOT EXISTS] [db.]table_name
(
    columns list...
)
ENGINE = JDBC(dbms_uri, external_database, external_table)

エンジン変数

  • dbms_uri — URI of an external DBMS.

    形式: jdbc:<driver_name>://<host_name>:<port>/?user=<username>&password=<password>. MySQLの例: jdbc:mysql://localhost:3306/?user=root&password=root.

  • external_database — Database in an external DBMS.

  • external_table — Name of the table in external_database.

使用例

コンソールクライアントに直接接続してMySQL serverでテーブルを作成する:

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)

ClickHouse serverでテーブルを作成し、そこからデータを選択する:

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')
SELECT *
FROM jdbc_table
┌─int_id─┬─int_nullable─┬─float─┬─float_nullable─┐
│      1 │         ᴺᵁᴸᴸ │     2 │           ᴺᵁᴸᴸ │
└────────┴──────────────┴───────┴────────────────┘

も参照。

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