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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Application
* @subpackage Resource
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
require_once 'Zend/Application/Resource/ResourceAbstract.php';
require_once 'Zend/Db/Table.php';
/**
*/
/**
* Cache Manager resource
*
* Example configuration:
* <pre>
* resources.multidb.db1.adapter = "pdo_mysql"
* resources.multidb.db1.host = "localhost"
* resources.multidb.db1.username = "webuser"
* resources.multidb.db1.password = "XXXX"
* resources.multidb.db1.dbname = "db1"
* resources.multidb.db1.default = true
*
* resources.multidb.db2.adapter = "pdo_pgsql"
* resources.multidb.db2.host = "example.com"
* resources.multidb.db2.username = "dba"
* resources.multidb.db2.password = "notthatpublic"
* resources.multidb.db2.dbname = "db2"
* </pre>
*
* @category Zend
* @package Zend_Application
* @subpackage Resource
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Application_Resource_Multidb extends Zend_Application_Resource_ResourceAbstract
{
/**
* Associative array containing all configured db's
*
* @var array
*/
protected $_dbs = array();
/**
* An instance of the default db, if set
*
* @var null|Zend_Db_Adapter_Abstract
*/
protected $_defaultDb;
/**
* Initialize the Database Connections (instances of Zend_Db_Table_Abstract)
*
* @return Zend_Application_Resource_Multidb
*/
public function init()
{
$options = $this->getOptions();
foreach ($options as $id => $params) {
$adapter = $params['adapter'];
$default = (int) (
isset($params['isDefaultTableAdapter']) && $params['isDefaultTableAdapter']
|| isset($params['default']) && $params['default']
);
unset(
$params['adapter'],
$params['default'],
$params['isDefaultTableAdapter']
);
$this->_dbs[$id] = Zend_Db::factory($adapter, $params);
if ($default) {
$this->_setDefault($this->_dbs[$id]);
}
}
return $this;
}
/**
* Determine if the given db(identifier) is the default db.
*
* @param string|Zend_Db_Adapter_Abstract $db The db to determine whether it's set as default
* @return boolean True if the given parameter is configured as default. False otherwise
*/
public function isDefault($db)
{
if(!$db instanceof Zend_Db_Adapter_Abstract) {
$db = $this->getDb($db);
}
return $db === $this->_defaultDb;
}
/**
* Retrieve the specified database connection
*
* @param null|string|Zend_Db_Adapter_Abstract $db The adapter to retrieve.
* Null to retrieve the default connection
* @return Zend_Db_Adapter_Abstract
* @throws Zend_Application_Resource_Exception if the given parameter could not be found
*/
public function getDb($db = null)
{
if ($db === null) {
return $this->getDefaultDb();
}
if (isset($this->_dbs[$db])) {
return $this->_dbs[$db];
}
throw new Zend_Application_Resource_Exception(
'A DB adapter was tried to retrieve, but was not configured'
);
}
/**
* Get the default db connection
*
* @param boolean $justPickOne If true, a random (the first one in the stack)
* connection is returned if no default was set.
* If false, null is returned if no default was set.
* @return null|Zend_Db_Adapter_Abstract
*/
public function getDefaultDb($justPickOne = true)
{
if ($this->_defaultDb !== null) {
return $this->_defaultDb;
}
if ($justPickOne) {
return reset($this->_dbs); // Return first db in db pool
}
return null;
}
/**
* Set the default db adapter
*
* @var Zend_Db_Adapter_Abstract $adapter Adapter to set as default
*/
protected function _setDefault(Zend_Db_Adapter_Abstract $adapter)
{
Zend_Db_Table::setDefaultAdapter($adapter);
$this->_defaultDb = $adapter;
}
}
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