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dockers/quotas/html/express_webapp/database.js

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+
+// Creating new Object of Sequelize
+const sequelize = new Sequelize(
+    process.env.MYSQL_DATABASE,
+    process.env.MYSQL_USER,
+    process.env.MYSQL_PASSWORD, {
+        // Explicitly specifying 
+        // mysql database
+        dialect: 'mariadb',
+        // By default host is 'localhost'           
+        host: 'db'
+    }
+);
+
+// Exporting the sequelize object. 
+// We can use it in another file
+// for creating models
+module.exports = sequelize