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
2.8 KiB
| machine_translated | machine_translated_rev | toc_priority | toc_title |
|---|---|---|---|
| true | 72537a2d52 |
34 | JDBC |
JDBC
Permet à ClickHouse de se connecter à des bases de données externes via JDBC.
Pour implémenter la connexion JDBC, ClickHouse utilise le programme séparé clickhouse-JDBC-pont cela devrait fonctionner comme un démon.
Ce moteur prend en charge le Nullable type de données.
Création d'une Table
CREATE TABLE [IF NOT EXISTS] [db.]table_name
(
columns list...
)
ENGINE = JDBC(dbms_uri, external_database, external_table)
Les Paramètres Du Moteur
-
dbms_uri— URI of an external DBMS.Format:
jdbc:<driver_name>://<host_name>:<port>/?user=<username>&password=<password>. Exemple pour MySQL:jdbc:mysql://localhost:3306/?user=root&password=root. -
external_database— Database in an external DBMS. -
external_table— Name of the table inexternal_database.
Exemple D'Utilisation
Création d'une table dans le serveur MySQL en se connectant directement avec son client console:
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)
Création d'une table dans le serveur ClickHouse et sélection des données:
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 │
└────────┴──────────────┴───────┴────────────────┘