Java を使用して Cassandra ベースの時系列データベース アプリケーションを開発する方法

CREATE KEYSPACE IF NOT EXISTS my_keyspace WITH REPLICATION = {'class': 'SimpleStrategy', 'replication_factor': 1};
USE my_keyspace;

CREATE TABLE IF NOT EXISTS time_series_data (
    sensor_id UUID,
    timestamp TIMESTAMP,
    value DOUBLE,
    PRIMARY KEY (sensor_id, timestamp)
)
WITH CLUSTERING ORDER BY (timestamp DESC);

<dependency>
    <groupId>com.datastax.oss</groupId>
    <artifactId>java-driver-core</artifactId>
    <version>4.13.1</version>
</dependency>

import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.CqlSessionBuilder;

public class CassandraTimeSeriesApp {
    public static void main(String[] args) {
        try (CqlSession session = new CqlSessionBuilder().build()) {
            // 建立Cassandra会话
            
            // 插入数据
            session.execute("INSERT INTO my_keyspace.time_series_data (sensor_id, timestamp, value) VALUES (?, ?, ?)",
                    UUID.randomUUID(), Instant.now(), 25.0);

            // 查询数据
            ResultSet resultSet = session.execute("SELECT * FROM my_keyspace.time_series_data WHERE sensor_id=? LIMIT 10",
                    UUID.randomUUID());
            
            // 处理查询结果
            for (Row row : resultSet) {
                UUID sensorId = row.getUuid("sensor_id");
                Instant timestamp = row.getInstant("timestamp");
                double value = row.getDouble("value");
                
                // 处理数据
                System.out.printf("sensorId=%s, timestamp=%s, value=%f%n", sensorId, timestamp, value);
            }
        }
    }
}