add validation and add pool

db.js

@@ -1,20 +1,28 @@
-const mysql = require('mysql2');
+const mysql = require('mysql2/promise');
 const envConfig = require('./envConfigurations/EnvConfigurations');
 
-const connection = mysql.createConnection({
+const pool = mysql.createPool({
   host: envConfig.db.host,
   port: envConfig.db.port,
   user: envConfig.db.user,
   password: envConfig.db.password,
-  database: envConfig.db.name
+  database: envConfig.db.name,
+  waitForConnections: true,
+  connectionLimit: 10,
+  queueLimit: 40,
+  connectTimeout: 5000
 });
 
-connection.connect(err => {
-  if (err) {
-    console.error('Error al conectarse con la base de datos:', err);
-    return;
+(async () => {
+  try {
+    const connection = await pool.getConnection();
+    console.log('Conectado con la base de datos');
+    connection.release();
+  } catch (err) {
+    console.error('Error al conectarse con la base de datos:', err.message);
+    process.exit(1);
   }
-  console.log('Conectado con la base de datos');
-});
+})();
 
-module.exports = connection;
+module.exports = pool;
+//IO