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| <div class="sect1"> |
| <h2 id="apache_iotdb">Apache IotDB</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Apache IoTDB is database for storing time serie data. |
| Therefore, it can be a good solution for managing the data which is collected by PLC4x.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="data_model_concept">Data Model (Concept)</h3> |
| <div class="paragraph"> |
| <p>Given a PLC address and some fields, we can consider the PLC as a <code>device</code> in IoTDB, and each field |
| as a <code>measurement</code> in IoTDB. A couple of PLCs form a <code>storage group</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, there is a virtual storage group <code>mi</code>, and a PLC <code>d1</code>, which has one field <code>RANDOM/foo:Integer</code>. |
| Then, in IoTDB, we can get a time series like <code>root.mi.d1.foo</code> (or <code>root.mi.d1.RANDOM_foo_Integer</code>, as you like). |
| Then, we can write data into IoTDB using JDBC with SQL or native API called session API.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="example">Example</h3> |
| <div class="paragraph"> |
| <p><a href="https://github.com/apache/plc4x/tree/develop/plc4j/examples/hello-integration-iotdb" class="bare">https://github.com/apache/plc4x/tree/develop/plc4j/examples/hello-integration-iotdb</a> shows an example |
| to collect data using PLC4x and then writing data to IoTDB.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To run the java example, some arguments are needed:</p> |
| </div> |
| <div class="paragraph"> |
| <p>e.g., <code>java -jar …​.. --connection-string simulated://127.0.0.1 --field-address RANDOM/foo:Integer --polling-interval 1000 --iotdb-address 127.0.0.1:6667 --iotdb-user-name root --iotdb-user-password root --iotdb-sg mi --iotdb-device d1 --iotdb-datatype INT32 --use-jdbc false</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>Then PLC4x will collect data from a simulated PLC device, which generate random integer per 1 second. |
| IoTDB’s address is 127.0.0.1 and the port is 6667. The data will be stored in device <code>root.m1.d1</code>, and the measurement name is RANDOM_foo_Integer.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you are using IoTDB v0.10.0 with the default configuration, and do not manually create the above time series, then IoTDB will consider the data as float. |
| So, after running the program a few secondes, you can query the data using IoTDB’s command line: <code>select * from root.mi.d1;</code></p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>+-----------------------------+-----------------------------+ |
| | Time|root.mi.d1.RANDOM_foo_Integer| |
| +-----------------------------+-----------------------------+ |
| |2020-07-16T20:01:39.216+08:00| -1.34242598E9| |
| |2020-07-16T20:01:40.150+08:00| -9.4141104E7| |
| |2020-07-16T20:01:41.154+08:00| 1.40969664E9| |
| |2020-07-16T20:01:42.155+08:00| 9.5824531E8| |
| |2020-07-16T20:01:43.157+08:00| -4.207406E7| |
| +-----------------------------+-----------------------------+</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The detailed usage about IoTDB can be found <a href="https://iotdb.apache.org/UserGuide/Master/Client/Programming%20-%20Native%20API.html" class="bare">https://iotdb.apache.org/UserGuide/Master/Client/Programming%20-%20Native%20API.html</a></p> |
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