$record = new GenericObject('sometable', 1); // запись id=1 таблицы `sometable`

print $record->getField('name'); // вывести значение поля name

<?php
require_once('class.database.php');
// код класса Database опущен, т.к. имхо и так понятно что в нём
 
class GenericObject {
 
  private $db;
  private $id;
  private $table_name;
  private $table_fields = array();
  private $loaded;
  private $modified;
  private $modified_fields = array();
 
  public function __construct($table_name, $id = false) {
    $this->db = Database::instance();
    $this->table_name = $table_name;
    $this->id = $id;
  }
 
  private function reload() {
    if (! $this->id) {
      return false;
    }
    $id = $this->id;
    $table_name = $this->table_name;
    $db = $this->db;
    
    if (! is_numeric($id)) {
      $id = "'$id'";
    }
    list($this->table_fields) = $db->select("SELECT * FROM `$table_name` WHERE `id`=$id");
    $this->loaded = true;
    if (sizeof($this->modified_fields) > 0) {
      foreach ($this->modified_fields as $field => $value) {
        $this->modified_fields[$field] = $value;
      }
    }
  }
  
  // "альтернативный вход" в reload()
  private function load() {
    $this->reload();
    $this->loaded = true;
  }
 
  public function getID() {
    return $this->id;
  }
 
  public function getField($field) {
    if ((! $this->loaded) && ($this->id)) {
      $this->load();
    }
    if (array_key_exists($field, $this->table_fields)) {
      return $this->table_fields[$field];
    } else {
      return false;
    }
  }
 
  public function setField($field, $value) {
    if (! $this->loaded) {
      $this->load();
    }
    $this->table_fields[$field] = $value;
    $this->modified = true;
    $this->modified_fields[$field] = true;
  }
 
  // Удаление строки из таблицы - в случае успеха вернёт 1, иначе - 0
  public function destroy() {
    if ($this->id) {
      $condition = array('id' => $this->id);
      return $this->db->delete($this->table_name, $condition);
    }
  }
 
  public function save() {
    $id = $this->id;
    $table_name = $this->table_name;  
    $db = $this->db;
  
    if (! $id) {
      $this->loaded = false;
    }
 
    // Формируем массив поле-значение
    $record = array();
    foreach ($this->table_fields as $field => $value) {
      if ((! is_numeric($field)) && $value) {
        $record[$field] = $value;
      }
    }
 
    if (! $this->loaded) {
    // Новая сущность - INSERT
      $affected_rows = $db->insert($table_name, $record);
      $this->id = $db->getLastID();
       
    } else {
    // Изменение сущности - UPDATE
      $condition = array('id' => $id);
      $affected_rows = $db->update($table_name, $record, $condition);
    }
    return $affected_rows;
  }
 
}
?>