Init

.gitignore

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+.env
+node_modules
+.env

Dockerfile

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+FROM node:latest
+
+WORKDIR /app
+
+COPY package.json package.json
+COPY .env .env
+COPY . .
+
+RUN npm install
+
+CMD ["node", "app.js"]

app.js

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+const mysql = require("mysql");
+
+require('dotenv').config()
+
+const connection = mysql.createConnection({
+  host: process.env.HOST,
+  user: process.env.USER,
+  password: process.env.PASSWORD,
+  database: process.env.DATABASE,
+});
+
+connection.connect();
+
+connection.query("SELECT 1 + 1 AS solution", function (error, results, fields) {
+  if (error) throw error;
+  console.log("The solution is: ", results[0].solution);
+});
+
+connection.end();

docker-compose.yml

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+version: "3.7"
+
+services:
+  app:
+    build: .
+  networks: 
+    - bot
+
+networks: 
+  bot:
+    external: true

env-example.txt

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+TOKEN="token"
+HOST="iip"
+USER="admin"
+PASSWORD="password"
+DATABASE="database_name"

package.json

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+{
+  "name": "ntw",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^10.0.0",
+    "mysql": "^2.18.1"
+  }
+}

test.js

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+require('dotenv').config()
+
+console.log(process.env.USER)

testt.js

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+const length = 4;
+const numbers = [];
+
+for(var i = 0; i<length; i++); {
+    numbers.push(i +1)
+}
+numbers;
+
+console.log(numbers)