$memo = new DTable('{{memo}}');
$memo->msg = 'this is content';
$memo->save();
//last insertid
echo $memo->id ;

$memo = DTable::model('{{memo}}')->findByPk(12);
$memo->msg = "modefid content";
$memo->save();
//使用非默认数据库，需要在 config/main.php 文件中定义数据库连接，如： 
'components' => array(
'db-other'=>array(
      'class' => 'CDbConnection',
      'connectionString' => 'mysql:host=localhost;dbname=cdcol;charset=utf8',
      'username' => 'root',
      'password' =>'',
      'tablePrefix' => '',
      'autoConnect' => false,
),
);
DTable::$db = Yii::app()->getComponent('db-other');
$memo = DTable::model('{{memo}}')->findByPk(12);

/**
* DTable class file.
* @author zhangxugg@163.com
* @since Yii 1.1.10
* @package application.models
* @version $Id DTable.php 1 2012-03-24 23:29 $
DTable provides dynamic table model supports for some application entironment such as dynamic-generated database tables, or simple read actions. 
please contact zhangxugg@163.com for the source code.

new record :

$model = new DTable('table_name'); 
//use table prefix:
$model = new DTable('{{table_name}}');
$model->id = $id;
$model->name = 'zhangxugg@163.com';
$model->save();

update:

$model = DTable::model('{{table_name}}')
$model->name = 'zhangxugg@163.com'
$model->save();
$list = $model->findAll();
use non-default database connection :
DTable::$db = Yii::app()->getCompoments('db-extra');

tips : you must define the database connection informations in config/main.php

'components' => array(
   'db-extra' => array(
     'class' => 'CDbConnection',
     'connectionString' => 'mysql:host=localhost;dbname=cdcol;charset=utf8',
     'username' => 'root',
     'password' =>'',
     'tablePrefix' => '',
     'autoConnect' => false,
   ),
)

DTable source code :

class DTable extends CActiveRecord {
  private static $tableName ;
  public function __construct($table_name = '') {
    if($table_name === null) {
      parent::__construct(null);
    } else {
      self::$tableName = $table_name ;
      parent::__construct();
    }
  }
public static function model($table_name='')
{
  self::$tableName = $table_name ;
  return parent::model(__CLASS__);
}
public function tableName()
{
return self::$tableName;
}
}
*/