Zend FR

/**
* Mise en place d'une instance d'adaptateur de base de données et passage de ceux-ci au registre
*/
$webmaster_db = Zend_Db::factory($registry->config->db->driver, array(
    'host'        => $registry->config->db->host,
    'username'    => $registry->config->db->user,
    'password'    => $registry->config->db->password,
    'dbname'      => 'MVC_'.$registry->system->webmaster->reference.'_db',
    'options'     => array(
                         Zend_Db::CASE_FOLDING => Zend_Db::CASE_NATURAL,
                         Zend_Db::AUTO_QUOTE_IDENTIFIERS => true
                     )
));

Zend_Registry::set('webmaster_db', $webmaster_db);


// plus loin....
$webmaster_db->getConnection($webmaster_db);
$result = $webmaster_db->fetchRow('SELECT * FROM private_table_client WHERE id = 1');

/**
* Mise en place d'une instance d'adaptateur de base de données et passage de ceux-ci au registre
*/
$webmaster_db = Zend_Db::factory($registry->config->db->driver, array(
    'host'        => $registry->config->db->host,
    'username'    => $registry->config->db->user,
    'password'    => $registry->config->db->password,
    'dbname'      => 'MVC_'.$registry->system->webmaster->reference.'_db',
    'options'     => array(
                         Zend_Db::CASE_FOLDING => Zend_Db::CASE_NATURAL,
                         Zend_Db::AUTO_QUOTE_IDENTIFIERS => true
                     )
));

Zend_Registry::set('webmaster_db', $webmaster_db);


// plus loin...
$webmaster_db->getConnection($webmaster_db);
$table_webmaster = new WebmasterModel(array('webmaster_db' => 'webmaster_db')); // direct to registry inport
$rows = $table_webmaster->find(1);

<?php
/**
* Class WebmasterModel.
*
* Classe de bootstrap redirigant le index.php vers celle-ci
* et ce pour des raisons de sécurité.
*
* @author      Deschamps Sébastien <beroots74@gmail.com>
* @copyright   Deschamps Sébastien, all rights reserved.
* @version     1.0
* @since       PHP 5
* @name        WebmasterModel
*/

class WebmasterModel extends Zend_Db_Table_Abstract
{
    protected $_schema;
    protected $_name = 'WebmasterModel';
    protected $_primary = 'id';
    protected $pseudo;
    protected $mpass;
    protected $prenom;
    protected $nom;
    protected $email;

    public function __construct()
    {
        // on recupere les données depuis le registre
        $registry = Zend_Registry::getInstance();
        $this->webmasterReference = $registry->system->webmaster->reference;
        $this->_schema = 'MVC_'.$this->webmasterReference.'_db';

        // on paramètre le options de table
        $this->_setupDatabaseAdapter();
        $this->_setupTableName();
        $this->_setupMetadata();
        $this->_setupPrimaryKey();
    }
    protected function _setupDatabaseAdapter()
    {
        $this->_adapter = 'Pdo_Mysql';
        parent::_setupDatabaseAdapter();
    }
    protected function _setupTableName()
    {
        $this->_name = 'WebmasterModel';
        parent::_setupTableName();
    }
    protected function _setupMetadata()
    {
        $this->_schema = $this->_schema;
        parent::_setupMetadata();
    }
    protected function _setupPrimaryKey()
    {
        $this->_primary = 'id';
        parent::_setupPrimaryKey();
    }
    protected function describeTable()
    {
        $this->_cols = array();
        $this->_cols[0]  = 'id';
        $this->_cols[1]  = 'pseudo';
        $this->_cols[2]  = 'mpass';
        $this->_cols[16] = 'prenom';
        $this->_cols[17] = 'nom';
        $this->_cols[20] = 'email';
    }

}