物联网数据库 IoTDB —— 从协议到数据

首先，先允许我，祝各位读者小可爱们，节日快乐。

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 measurements;
    private List