w

2025-11-18 20:26:36 -05:00
commit ce12ac2cce
45 changed files with 10517 additions and 0 deletions
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+<?php
+/**
+ * Clase Database - Manejo de conexión a base de datos
+ * Fecha: 13 de noviembre de 2025
+ */
+
+class Database {
+    private static $instance = null;
+    private $pdo;
+    
+    private function __construct() {
+        try {
+            $dsn = "mysql:host=" . DB_HOST . ";port=" . DB_PORT . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;
+            $options = [
+                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+                PDO::ATTR_EMULATE_PREPARES => false,
+                PDO::ATTR_PERSISTENT => true,
+                PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES " . DB_CHARSET . " COLLATE utf8mb4_unicode_ci"
+            ];
+            
+            $this->pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
+        } catch (PDOException $e) {
+            error_log("Database connection failed: " . $e->getMessage());
+            throw new Exception("Error de conexión a la base de datos");
+        }
+    }
+    
+    public static function getInstance() {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+    
+    public function getConnection() {
+        return $this->pdo;
+    }
+    
+    public function query($sql, $params = []) {
+        try {
+            $stmt = $this->pdo->prepare($sql);
+            $stmt->execute($params);
+            return $stmt;
+        } catch (PDOException $e) {
+            error_log("Query failed: " . $e->getMessage() . " SQL: " . $sql);
+            throw new Exception("Error en la consulta a la base de datos");
+        }
+    }
+    
+    public function fetch($sql, $params = []) {
+        $stmt = $this->query($sql, $params);
+        return $stmt->fetch();
+    }
+    
+    public function fetchAll($sql, $params = []) {
+        $stmt = $this->query($sql, $params);
+        return $stmt->fetchAll();
+    }
+    
+    public function insert($table, $data) {
+        $keys = array_keys($data);
+        $fields = implode(',', $keys);
+        $placeholders = ':' . implode(', :', $keys);
+        
+        $sql = "INSERT INTO {$table} ({$fields}) VALUES ({$placeholders})";
+        $stmt = $this->query($sql, $data);
+        
+        return $this->pdo->lastInsertId();
+    }
+    
+    public function update($table, $data, $where, $whereParams = []) {
+        $fields = [];
+        foreach (array_keys($data) as $key) {
+            $fields[] = "{$key} = :{$key}";
+        }
+        $fieldsStr = implode(', ', $fields);
+        
+        $sql = "UPDATE {$table} SET {$fieldsStr} WHERE {$where}";
+        $params = array_merge($data, $whereParams);
+        
+        return $this->query($sql, $params);
+    }
+    
+    public function delete($table, $where, $params = []) {
+        $sql = "DELETE FROM {$table} WHERE {$where}";
+        return $this->query($sql, $params);
+    }
+    
+    public function beginTransaction() {
+        return $this->pdo->beginTransaction();
+    }
+    
+    public function commit() {
+        return $this->pdo->commit();
+    }
+    
+    public function rollback() {
+        return $this->pdo->rollback();
+    }
+    
+    public function lastInsertId() {
+        return $this->pdo->lastInsertId();
+    }
+    
+    // Prevenir clonación
+    private function __clone() {}
+    
+    // Prevenir deserialización
+    public function __wakeup() {
+        throw new Exception("Cannot unserialize singleton");
+    }
+}
+?>