iotdb查询结果集转换为java对象

iotdb查询结果集转换为java对象

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要将IoTDB查询结果集转换为Java对象,您需要编写Java代码以解析查询结果并将其转换为相应的Java对象。

以下是一个示例代码,可以将IoTDB查询结果集转换为Java对象:

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.Field;
import org.apache.iotdb.tsfile.read.common.RowRecord;
import org.apache.iotdb.tsfile.read.common.TimeRange;
import org.apache.iotdb.tsfile.read.filter.basicfilters.PointFilter;
import org.apache.iotdb.tsfile.read.filter.factory.FilterFactory;
import org.apache.iotdb.tsfile.read.reader.TsFileInputDescriptor;
import org.apache.iotdb.tsfile.read.reader.TsFilePageReader;
import org.apache.iotdb.tsfile.utils.Binary;

public class IoTDBToJavaObject {

    public static void main(String[] args) throws IOException {
        String filePath = "path/to/your/tsfile";
        TsFileInputDescriptor inputDescriptor = new TsFileInputDescriptor(filePath);
        TsFilePageReader reader = new TsFilePageReader(inputDescriptor);

        // Create a filter to select data for the desired device and sensor
        FilterFactory factory = FilterFactory.instance();
        PointFilter deviceFilter = factory.deviceFilter("device-id");
        PointFilter sensorFilter = factory.sensorFilter("sensor-id");
        PointFilter filter = factory.and(deviceFilter, sensorFilter);

        // Read the data and convert it to Java objects
        List<MyJavaObject> javaObjects = new ArrayList<>();
        while (reader.hasNext()) {
            RowRecord rowRecord = reader.next();
            TimeRange timeRange = rowRecord.getTimeRange();
            TSDataType dataType = rowRecord.getFields()[1].getDataType();
            double value = rowRecord.getFields()[1].getBinaryStream().readDouble();
            MyJavaObject javaObject = new MyJavaObject(timeRange, dataType, value);
            javaObjects.add(javaObject);
        }
        reader.close();

        // Print the Java objects
        for (MyJavaObject javaObject : javaObjects) {
            System.out.println(javaObject);
        }
    }
}

在这个示例中,我们假设您已经定义了一个名为MyJavaObject的Java类,该类具有以下属性:timeRange(时间范围)、dataType(数据类型)和value(值)。您需要根据您的需求修改这个示例代码,以便将查询结果集正确地转换为相应的Java对象。

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