mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 17:32:32 +00:00
2.2 KiB
2.2 KiB
sidebar_label | sidebar_position | keywords | description | slug | |||||
---|---|---|---|---|---|---|---|---|---|
R2DBC Driver | 5 |
|
ClickHouse R2DBC Driver | /ja/integrations/java/r2dbc |
import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; import CodeBlock from '@theme/CodeBlock';
R2DBC ドライバー
R2DBC は、ClickHouse 向けの非同期 Java クライアントのラッパーです。
環境要件
- OpenJDK バージョン >= 8
セットアップ
<dependency>
<groupId>com.clickhouse</groupId>
<!-- SPI 0.9.1.RELEASE の場合、clickhouse-r2dbc_0.9.1 に変更 -->
<artifactId>clickhouse-r2dbc</artifactId>
<version>0.6.5</version>
<!-- すべての依存関係を含むuber jarを使用し、より小さいjarにするためにclassifierをhttpまたはgrpcに変更 -->
<classifier>all</classifier>
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
ClickHouse に接続
ConnectionFactory connectionFactory = ConnectionFactories
.get("r2dbc:clickhouse:http://{username}:{password}@{host}:{port}/{database}");
Mono.from(connectionFactory.create())
.flatMapMany(connection -> connection
クエリ
connection
.createStatement("select domain, path, toDate(cdate) as d, count(1) as count from clickdb.clicks where domain = :domain group by domain, path, d")
.bind("domain", domain)
.execute()
.flatMap(result -> result
.map((row, rowMetadata) -> String.format("%s%s[%s]:%d", row.get("domain", String.class),
row.get("path", String.class),
row.get("d", LocalDate.class),
row.get("count", Long.class)))
)
.doOnNext(System.out::println)
.subscribe();
インサート
connection
.createStatement("insert into clickdb.clicks values (:domain, :path, :cdate, :count)")
.bind("domain", click.getDomain())
.bind("path", click.getPath())
.bind("cdate", LocalDateTime.now())
.bind("count", 1)
.execute();