![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/Home-Automation-Raspberry-Pi-MQTT.jpg?resize=589%2C331&quality=100&strip=all&ssl=1\")
<\/p>\nIn this project you\u2019ll install an SQLite package for Node-RED and learn how to write simple SQL queries to interact with your SQLite database.<\/p>\n
<\/p>\n
Recommended resources:<\/strong><\/p>\n If you like home automation and you want to build a complete home automation system, I recommend downloading my home automation course<\/a>.<\/p>\n Before you continue reading this project, please\u00a0make sure you have Raspbian Operating System installed in your Raspberry Pi.<\/p>\n You can read my Getting Started with the Raspberry Pi Guide<\/a><\/strong>\u00a0to install Raspbian and complete the basic setup.<\/p>\n Follow this next tutorial to learn\u00a0how to Install SQLite database on a Raspberry Pi <\/a>. Having SQLite installed in your Raspberry Pi.<\/p>\n Run the list of commands below to install node-red-node-sqlite in your Node-RED user directory. This packages gives you basic access to an SQLite database.<\/p>\n Restart your Node-RED software with the next commands for the changes to take effect:<\/p>\n When your Node-RED software is back on, you can open it entering the RPi IP address\u00a0in a web browser followed by :1880<\/strong>\u00a0as follows:<\/p>\n In my case is:<\/p>\n A new node called sqlite <\/strong>should appear on the left under the storage<\/strong> tab:<\/p>\n In this flow, you\u2019re going to send 5 SQL queries (CREATE, INSERT, SELECT, DELETE and DROP) to your SQLite database. Follow these next 10 steps to create your flow:<\/p>\n 1) Drag 5 inject<\/strong> nodes, 1 sqlite<\/strong> node and 1 debug<\/strong> node<\/p>\n 2) Press the Add new sqlitedb<\/strong> button<\/p>\n 3) Type \/tmp\/sqlite<\/strong> in the Database<\/strong> field<\/p>\n 4) Configure your CREATE<\/strong> inject<\/strong> node as follows<\/p>\n 5) Configure your INSERT<\/strong> inject<\/strong> node<\/p>\n 6) Configure your SELECT<\/strong> inject<\/strong> node with<\/p>\n 7) Configure your DELETE<\/strong> inject<\/strong> node as follows<\/p>\n 8) Configure your DROP<\/strong> inject<\/strong> node<\/p>\n 9) Connect all your nodes<\/p>\n 10) To save your application, you need to click the deploy button on the top right corner<\/p>\n Your application is saved and ready.<\/p>\n Let\u2019s test the simple flow. Open the debug<\/strong> window and press the first\u00a0inject<\/strong> node\u00a0to trigger the CREATE<\/b> SQL query. Then, follow this procedure:<\/p>\n As you can see, the database schema was created, data was inserted, you can select the data from the dhtreadings table, delete it and drop the table.<\/p>\n This is a very basic example that can easily be extended for your own projects.<\/p>\n This post is a quick guide to send simple SQL queries to an SQLite database with Node-RED. You can apply this concept to create a complex database that actually stores useful readings.<\/p>\n Like home automation? Learn more about Node-RED, Raspberry Pi, ESP8266 and Arduino\u00a0with\u00a0my course:\u00a0Build a Home Automation System for $100<\/a>.<\/p>\n\n
Basic Raspberry Pi setup<\/h2>\n
Installing SQLite<\/h2>\n
Installing Node-RED SQLite<\/h2>\n
pi@raspberry:~ $ sudo apt-get install npm<\/strong>\r\npi@raspberry:~ $ sudo npm install -g npm@2.x<\/strong>\r\npi@raspberry:~ $ hash -r<\/strong>\r\npi@raspberry:~ $ cd ~\/.node-red<\/strong>\r\npi@raspberry:~\/.node-red $ npm install node-red-node-sqlite<\/strong><\/pre>\n
pi@raspberrypi:~\/.node-red $ cd<\/strong>\r\npi@raspberrypi:~ $ node-red-stop<\/strong>\r\npi@raspberrypi:~ $ node-red-start<\/strong><\/pre>\n
Checking the installation<\/h2>\n
http:\/\/YOUR_RPi_IP_ADDRESS<\/span>:1880<\/strong><\/pre>\nhttp:\/\/192.168.1.98:1880<\/strong><\/pre>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/1_sqlite_node_red_installed.png?resize=152%2C289&quality=100&strip=all&ssl=1\")
<\/p>\nCreating the flow<\/h2>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/2_drag_nodes.png?resize=533%2C254&quality=100&strip=all&ssl=1\")
<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/3_configure_sqlite-f.png?resize=493%2C191&quality=100&strip=all&ssl=1\")
<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/4_sqlite_default_configs.png?resize=492%2C156&quality=100&strip=all&ssl=1\")
<\/p>\nCREATE TABLE dhtreadings(id INTEGER PRIMARY KEY AUTOINCREMENT, temperature NUMERIC, humidity NUMERIC, currentdate DATE, currenttime TIME, device TEXT)<\/strong><\/pre>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/5_inject_node1.png?resize=489%2C401&quality=100&strip=all&ssl=1\")
<\/p>\nINSERT INTO dhtreadings(temperature, humidity, currentdate, currenttime, device) values(22.4, 48, date('now'), time('now'), \"manual\")<\/strong><\/pre>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/6_inject_node2.png?resize=491%2C398&quality=100&strip=all&ssl=1\")
<\/p>\nSELECT * FROM dhtreadings<\/strong><\/pre>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/7_inject_node3.png?resize=486%2C387&quality=100&strip=all&ssl=1\")
<\/p>\nDELETE from dhtreadings<\/strong><\/pre>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/8_inject_node4.png?resize=488%2C382&quality=100&strip=all&ssl=1\")
<\/p>\nDROP TABLE dhtreadings<\/strong><\/pre>\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/9_inject_node5.png?resize=491%2C381&quality=100&strip=all&ssl=1\")
<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/10_nodes_connected.png?resize=598%2C269&quality=100&strip=all&ssl=1\")
<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/11_deploy_button.png?resize=138%2C40&quality=100&strip=all&ssl=1\")
<\/p>\nTesting the flow<\/h2>\n
\n
![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/13_create_select.png?resize=635%2C264&quality=100&strip=all&ssl=1\")
<\/p>\n![\"\"](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/06\/12_sqlite.png?resize=354%2C868&quality=100&strip=all&ssl=1\")
<\/p>\nWrapping up<\/h2>\n