Primer version funcional

core/Database.php

@@ -0,0 +1,69 @@
+<?php
+
+class Database {
+    private static $instance = null;
+    private $pdo;
+
+    private function __construct() {
+        try {
+            $dsn = "mysql:host=" . DB_HOST . ";port=" . DB_PORT . ";dbname=" . DB_NAME . ";charset=utf8mb4";
+            $options = [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_EMULATE_PREPARES => false
+            ];
+            
+            $this->pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
+        } catch (PDOException $e) {
+            die("Error de conexión a base de datos: " . $e->getMessage());
+        }
+    }
+
+    public static function getInstance() {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
+    public function getConnection() {
+        return $this->pdo;
+    }
+
+    public function query($sql, $params = []) {
+        $stmt = $this->pdo->prepare($sql);
+        $stmt->execute($params);
+        return $stmt;
+    }
+
+    public function fetchAll($sql, $params = []) {
+        $stmt = $this->query($sql, $params);
+        return $stmt->fetchAll();
+    }
+
+    public function fetchOne($sql, $params = []) {
+        $stmt = $this->query($sql, $params);
+        return $stmt->fetch();
+    }
+
+    public function execute($sql, $params = []) {
+        $stmt = $this->query($sql, $params);
+        return $stmt->rowCount();
+    }
+
+    public function lastInsertId() {
+        return $this->pdo->lastInsertId();
+    }
+
+    public function beginTransaction() {
+        return $this->pdo->beginTransaction();
+    }
+
+    public function commit() {
+        return $this->pdo->commit();
+    }
+
+    public function rollback() {
+        return $this->pdo->rollBack();
+    }
+}