ClickHouse-Native-JDBC

This is a native JDBC library for accessing ClickHouse in Java.

Use the latest code

    git clone git@github.com:housepower/ClickHouse-Native-JDBC.git
    cd ClickHouse-Native-JDBC
    mvn clean package
    #build single jar with dependencies
    mvn clean package assembly:single -Dmaven.skip.assembly=false

Maven central

<dependency>
    <groupId>com.github.housepower</groupId>
    <artifactId>clickhouse-native-jdbc</artifactId>
    <version>2.0-stable</version>
</dependency>

Support Java8 or above

Differences from Yandex/Clickhouse-JDBC

• Data is organized and compressed by columns
• We implemented it using the TCP Protocol, with higher performance than HTTP, here is the benchmark.

Not Supported

• Non-values format
• Complex values expression, Like INSERT INTO test_table VALUES(toDate(123456))
• More compression method, like ZSTD

Example

Select query, see also SimpleQuery.java

    Connection connection = DriverManager.getConnection("jdbc:clickhouse://127.0.0.1:9000");

    Statement stmt = connection.createStatement();
    ResultSet rs = stmt.executeQuery("SELECT (number % 3 + 1) as n, sum(number) FROM numbers(10000000) GROUP BY n");

    while (rs.next()) {
      System.out.println(rs.getInt(1) + "\t" + rs.getLong(2));
    }

All DDL,DML queries, see also ExecuteQuery.java

    Connection connection = DriverManager.getConnection("jdbc:clickhouse://127.0.0.1:9000");

    Statement stmt = connection.createStatement();
    stmt.executeQuery("drop table if exists test_jdbc_example");
    stmt.executeQuery("create table test_jdbc_example(day default toDate( toDateTime(timestamp) ), timestamp UInt32, name String, impressions UInt32) Engine=MergeTree(day, (timestamp, name), 8192)");
    stmt.executeQuery("alter table test_jdbc_example add column costs Float32");
    stmt.executeQuery("drop table test_jdbc_example");

Batch insert query, see also BatchQuery.java

    Connection connection = DriverManager.getConnection("jdbc:clickhouse://127.0.0.1:9000");

    Statement stmt = connection.createStatement();
    stmt.executeQuery("drop table if exists test_jdbc_example");
    stmt.executeQuery("create table test_jdbc_example(day Date, name String, age UInt8) Engine=Log");

    PreparedStatement pstmt = connection.prepareStatement("INSERT INTO test_jdbc_example VALUES(?, ?, ?)");

    for (int i = 0; i < 200; i++) {
        pstmt.setDate(1, new Date(System.currentTimeMillis()));
        pstmt.setString(2, "Zhang San" + i);
        pstmt.setByte(3, (byte)i);
        pstmt.addBatch();
    }
    pstmt.executeBatch();
    stmt.executeQuery("drop table test_jdbc_example");