feat: initial import — ClickerZ formation project (Express + React/Vite)

Backend/database/client.js

@@ -0,0 +1,36 @@
+// Get variables from .env file for database connection
+const { DB_HOST, DB_PORT, DB_USER, DB_PASSWORD, DB_NAME } = process.env;
+
+// Create a connection pool to the database
+const mysql = require("mysql2/promise");
+
+const client = mysql.createPool({
+  host: DB_HOST,
+  port: DB_PORT,
+  user: DB_USER,
+  password: DB_PASSWORD,
+  database: DB_NAME,
+});
+
+// Try to get a connection to the database
+client
+  .getConnection()
+  .then((connection) => {
+    console.info(`Using database ${DB_NAME}`);
+
+    connection.release();
+  })
+  .catch((error) => {
+    console.warn(
+      "Warning:",
+      "Failed to establish a database connection.",
+      "Please check your database credentials in the .env file if you need a database access."
+    );
+    console.error("Error message:", error.message);
+  });
+
+// Store database name into client for further uses
+client.databaseName = DB_NAME;
+
+// Ready to export
+module.exports = client;