物联网数据库 IoTDB —— 从协议到数据

麒思妙想

发布于 2021-06-15 16:08:30

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发布于 2021-06-15 16:08:30

文章被收录于专栏：麒思妙想麒思妙想

在这个系列之前的文章里，我们介绍了Iotdb的LSM，以及Iot中的最佳实践，这次我们看看如何将mqtt和Iotdb整合起来。下面我们开始：

iotdb in docker

首先，做一个测试环境，我现在越发喜欢docker 和 WSL 了，除了吃点硬盘，内存和CPU资源以外，没有什么缺点了......

run in docker

直接把该开的端口都打开，只是测试环境，我就没再挂目录。

docker run -d -p 6667:6667 -p 31999:31999 -p 8181:8181 -p 5555:5555 -p 1883:1883 apache/iotdb

等待一会，执行 docker ps 查看是否成功了

➜  ~ docker ps
CONTAINER ID   IMAGE          COMMAND                  CREATED        STATUS        PORTS                                                                                                                                                                                                                       NAMES
ad9b18f8bff3   apache/iotdb   "/iotdb/sbin/start-s…"   2 hours ago    Up 2 hours    0.0.0.0:1883->1883/tcp, :::1883->1883/tcp, 0.0.0.0:5555->5555/tcp, :::5555->5555/tcp, 0.0.0.0:6667->6667/tcp, :::6667->6667/tcp, 0.0.0.0:8181->8181/tcp, :::

初步的iotdb in docker 环境，我们就搞好了。接下来，开启mqtt服务。

开启 Mqtt 服务

进入iotdb的docker docker exec -it ad9b18f8bff3 /bin/bash

编辑配置文件vi iotdb/conf/iotdb-engine.properties

开启服务，根据自己的需要，配置ip和端口等。

####################
### MQTT Broker Configuration
####################

# whether to enable the mqtt service.
enable_mqtt_service=false   # 修改成 true ， 代表开启 mqtt服务

# the mqtt service binding host.
mqtt_host=0.0.0.0 # ip

# the mqtt service binding port.
mqtt_port=1883  # 端口

# the handler pool size for handing the mqtt messages.
mqtt_handler_pool_size=1

# the mqtt message payload formatter.
mqtt_payload_formatter=json  # 数据格式

# max length of mqtt message in byte
mqtt_max_message_size=1048576

重启服务，如果不会，就重启docker镜像。

iotdb 基础操作

启动服务: sbin/start-client.sh root@ad9b18f8bff3:/iotdb/sbin# ./start-cli.sh --------------------- Starting IoTDB Cli --------------------- _____ _________ ______ ______ |_ _| | _ _ ||_ _ `.|_ _ \ | | .--.|_/ | | \_| | | `. \ | |_) | | | / .'`\ \ | | | | | | | __'. _| |_| \__. | _| |_ _| |_.' /_| |__) | |_____|'.__.' |_____| |______.'|_______/ version 0.11.1 IoTDB> login successfully
退出CLI: quit 或 exit
停止服务：$sbin/stop-server.sh
设置一个存储组到IOTDB，名为root : IoTDB> SET STORAGE GROUP TO root
查看当前IOTDB的存储组： IoTDB> SHOW STORAGE GROUP IoTDB> SHOW STORAGE GROUP +-------------+ |storage group| +-------------+ | root.test| +-------------+ Total line number = 1 It costs 0.127s
查看系统中存在的所有时间序列：IoTDB> SHOW TIMESERIES IoTDB> show timeseries +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ |root.test.wf01.wt01.temperature| null| root.test| FLOAT| GORILLA| SNAPPY|null| null| | root.test.wf01.wt01.status| null| root.test| BOOLEAN| RLE| SNAPPY|null| null| | root.test.wf01.wt01.hardware| null| root.test| TEXT| PLAIN| SNAPPY|null| null| +-------------------------------+-----+-------------+--------+--------+-----------+----+----------+ Total line number = 3 It costs 0.009s
查看系统中存在的特定时间序列: SHOW TIMESERIES root.test.wf01.wt01.status IoTDB> SHOW TIMESERIES root.test.wf01.wt01.status +--------------------------+-----+-------------+--------+--------+-----------+----+----------+ | timeseries|alias|storage group|dataType|encoding|compression|tags|attributes| +--------------------------+-----+-------------+--------+--------+-----------+----+----------+ |root.test.wf01.wt01.status| null| root.test| BOOLEAN| RLE| SNAPPY|null| null| +--------------------------+-----+-------------+--------+--------+-----------+----+----------+ Total line number = 1 It costs 0.003s
插入数据 INSERT INTO root.test.wf01.wt01(timestamp,status,temperature) values(200,false,20.71) IoTDB> INSERT INTO root.test.wf01.wt01(timestamp,status,temperature) values(200,false,20.71) Msg: The statement is executed successfully.
查看数据: select * from root.test; IoTDB> select * from root.test; +------------------------+-------------------------------+--------------------------+----------------------------+ | Time|root.test.wf01.wt01.temperature|root.test.wf01.wt01.status|root.test.wf01.wt01.hardware| +------------------------+-------------------------------+--------------------------+----------------------------+ |2021-01-20T02:00:00.000Z| 21.2| true| hello| +------------------------+-------------------------------+--------------------------+----------------------------+ Total line number = 1 It costs 0.077s
查看设备：show devices IoTDB> show devices +-------------------+ | devices| +-------------------+ |root.test.wf01.wt01| +-------------------+ Total line number = 1 It costs 0.002s

mqtt to iotdb

代码

构建一个实体对象，用于存储

package wang.datahub.iotdb;

import com.google.gson.Gson;
import java.util.List;

public class IotdbVO {
    private String device;
    private long timestamp = System.currentTimeMillis();
    private List<String> measurements;
    private List<Object> values;

    public String getDevice() {
        return device;
    }

    public void setDevice(String device) {
        this.device = device;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public List<String> getMeasurements() {
        return measurements;
    }

    public void setMeasurements(List<String> measurements) {
        this.measurements = measurements;
    }

    public List<Object> getValues() {
        return values;
    }

    public void setValues(List<Object> values) {
        this.values = values;
    }

    public String toJson(){
        Gson g = new Gson();
        String jsonData = g.toJson(this);
        return jsonData;
    }


    @Override
    public String toString() {
        return "IotdbVO{" +
                "device='" + device + '\'' +
                ", timestamp=" + timestamp +
                ", measurements=" + measurements +
                ", values=" + values +
                '}';
    }
}

使用祖传的代码来模拟数据发射到iotdb，这里直接将mqtt的主机和端口，配置到前文所修改的iotdb的mqtt服务上，就大功告成了。

package wang.datahub.iotdb;

import org.fusesource.mqtt.client.BlockingConnection;
import org.fusesource.mqtt.client.MQTT;
import org.fusesource.mqtt.client.QoS;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class EmmitToIotdb {

    public static void main(String[] args) {
        String[] hardwares = new String[]{
                "a1",
                "b1",
                "b2",
                "c3",
                "d1",
                "f5"
        };
        int count = 1000;
               
        for(int i = 0; i < count ;i++){
            IotdbVO iotdbVO = new IotdbVO();
            iotdbVO.setDevice("root.test.wf01.wt01");
            List<String> measurements = new ArrayList<>();
            List<Object> values = new ArrayList<>();
            measurements.add("temperature");
            measurements.add("status");
            measurements.add("hardware");

            Random r = new Random();
            values.add(r.nextInt(40));
            values.add(r.nextBoolean());
            values.add(hardwares[r.nextInt(hardwares.length)]);

            iotdbVO.setMeasurements(measurements);
            iotdbVO.setValues(values);
            emmitToIotdb(iotdbVO);
        }
    }

    public static void emmitToIotdb(IotdbVO content){
        try {
            MQTT mqtt = new MQTT();
            mqtt.setHost("127.0.0.1", 1883);
            mqtt.setUserName("root");
            mqtt.setPassword("root");

            BlockingConnection connection = mqtt.blockingConnection();
            connection.connect();

            String payload = content.toJson();
            connection.publish(content.getDevice(),payload.getBytes(), QoS.AT_LEAST_ONCE,false);

            connection.disconnect();
        } catch (Exception e){
            e.printStackTrace();
        }

    }


}