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78 lines
2.2 KiB
Markdown
78 lines
2.2 KiB
Markdown
---
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sidebar_label: R2DBC Driver
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sidebar_position: 5
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keywords: [clickhouse, java, driver, integrate, r2dbc]
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description: ClickHouse R2DBC Driver
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slug: /ja/integrations/java/r2dbc
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---
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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import CodeBlock from '@theme/CodeBlock';
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## R2DBC ドライバー
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[R2DBC](https://r2dbc.io/) は、ClickHouse 向けの非同期 Java クライアントのラッパーです。
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### 環境要件
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- [OpenJDK](https://openjdk.java.net) バージョン >= 8
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### セットアップ
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```xml
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<dependency>
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<groupId>com.clickhouse</groupId>
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<!-- SPI 0.9.1.RELEASE の場合、clickhouse-r2dbc_0.9.1 に変更 -->
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<artifactId>clickhouse-r2dbc</artifactId>
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<version>0.6.5</version>
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<!-- 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 -->
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<classifier>all</classifier>
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<exclusions>
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<exclusion>
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<groupId>*</groupId>
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<artifactId>*</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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```
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### ClickHouse に接続
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```java showLineNumbers
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ConnectionFactory connectionFactory = ConnectionFactories
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.get("r2dbc:clickhouse:http://{username}:{password}@{host}:{port}/{database}");
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Mono.from(connectionFactory.create())
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.flatMapMany(connection -> connection
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```
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### クエリ
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```java showLineNumbers
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connection
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.createStatement("select domain, path, toDate(cdate) as d, count(1) as count from clickdb.clicks where domain = :domain group by domain, path, d")
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.bind("domain", domain)
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.execute()
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.flatMap(result -> result
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.map((row, rowMetadata) -> String.format("%s%s[%s]:%d", row.get("domain", String.class),
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row.get("path", String.class),
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row.get("d", LocalDate.class),
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row.get("count", Long.class)))
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)
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.doOnNext(System.out::println)
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.subscribe();
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```
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### インサート
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```java showLineNumbers
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connection
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.createStatement("insert into clickdb.clicks values (:domain, :path, :cdate, :count)")
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.bind("domain", click.getDomain())
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.bind("path", click.getPath())
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.bind("cdate", LocalDateTime.now())
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.bind("count", 1)
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.execute();
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```
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