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Viewing File: /home/u456810272/domains/etfcareer.org/public_html/admin/sample3/includes/Database.php

<?php
class Database {
    private static $instance = null;
    private $pdo;
    
    private function __construct() {
        try {
            $this->pdo = new PDO(
                "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET,
                DB_USER,
                DB_PASS,
                [
                    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                    PDO::ATTR_EMULATE_PREPARES => false,
                    PDO::ATTR_PERSISTENT => false
                ]
            );
        } catch (PDOException $e) {
            throw new Exception("Database connection failed: " . $e->getMessage());
        }
    }
    
    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance->pdo;
    }
    
    public static function execute($sql, $params = []) {
        $pdo = self::getInstance();
        $stmt = $pdo->prepare($sql);
        $stmt->execute($params);
        return $stmt;
    }
    
    public static function fetchAll($sql, $params = []) {
        $stmt = self::execute($sql, $params);
        return $stmt->fetchAll();
    }
    
    public static function fetchOne($sql, $params = []) {
        $stmt = self::execute($sql, $params);
        return $stmt->fetch();
    }
    
    public static function insert($table, $data) {
        $columns = implode(', ', array_keys($data));
        $placeholders = ':' . implode(', :', array_keys($data));
        $sql = "INSERT INTO $table ($columns) VALUES ($placeholders)";
        
        $pdo = self::getInstance();
        $stmt = $pdo->prepare($sql);
        $stmt->execute($data);
        
        return $pdo->lastInsertId();
    }
    
    public static function update($table, $id, $data) {
        $setClause = [];
        foreach ($data as $key => $value) {
            $setClause[] = "$key = :$key";
        }
        $setClause = implode(', ', $setClause);
        
        $sql = "UPDATE $table SET $setClause WHERE id = :id";
        $data['id'] = $id;
        
        $stmt = self::execute($sql, $data);
        return $stmt->rowCount();
    }
    
    public static function delete($table, $id) {
        $sql = "DELETE FROM $table WHERE id = :id";
        $stmt = self::execute($sql, ['id' => $id]);
        return $stmt->rowCount();
    }
}
?>
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