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<?php
/**
* TDataSourceConfig class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Data
*/
namespace Prado\Data;
use Prado\Exceptions\TConfigurationException;
use Prado\Prado;
use Prado\TApplication;
/**
* TDataSourceConfig module class provides <module> configuration for database connections.
*
* Example usage: mysql connection
* <code>
* <modules>
* <module id="db1">
* <database ConnectionString="mysqli:host=localhost;dbname=test"
* username="dbuser" password="dbpass" />
* </module>
* </modules>
* </code>
*
* Usage in php:
* <code>
* class Home extends TPage
* {
* function onLoad($param)
* {
* $db = $this->Application->Modules['db1']->DbConnection;
* $db->createCommand('...'); //...
* }
* }
* </code>
*
* The properties of <connection> are those of the class TDbConnection.
* Set {@link setConnectionClass} attribute for a custom database connection class
* that extends the TDbConnection class.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @package Prado\Data
* @since 3.1
*/
class TDataSourceConfig extends \Prado\TModule
{
private $_connID='';
private $_conn;
private $_connClass='System.Data.TDbConnection';
/**
* Initalize the database connection properties from attributes in <database> tag.
* @param TXmlDocument xml configuration.
*/
public function init($xml)
{
if($this->getApplication()->getConfigurationType()==TApplication::CONFIG_TYPE_PHP)
{
if(isset($xml['database']) && is_array($xml['database']))
{
$db=$this->getDbConnection();
foreach($xml['database'] as $name=>$value)
$db->setSubProperty($name,$value);
}
}
else
{
if($prop=$xml->getElementByTagName('database'))
{
$db=$this->getDbConnection();
foreach($prop->getAttributes() as $name=>$value)
$db->setSubproperty($name,$value);
}
}
}
/**
* The module ID of another TDataSourceConfig. The {@link getDbConnection DbConnection}
* property of this configuration will equal to {@link getDbConnection DbConnection}
* of the given TDataSourceConfig module.
* @param string module ID.
*/
public function setConnectionID($value)
{
$this->_connID=$value;
}
/**
* @return string connection module ID.
*/
public function getConnectionID()
{
return $this->_connID;
}
/**
* Gets the TDbConnection from another module if {@link setConnectionID ConnectionID}
* is supplied and valid. Otherwise, a connection of type given by
* {@link setConnectionClass ConnectionClass} is created.
* @return TDbConnection database connection.
*/
public function getDbConnection()
{
if($this->_conn===null)
{
if($this->_connID!=='')
$this->_conn = $this->findConnectionByID($this->getConnectionID());
else
$this->_conn = Prado::createComponent($this->getConnectionClass());
}
return $this->_conn;
}
/**
* Alias for getDbConnection().
* @return TDbConnection database connection.
*/
public function getDatabase()
{
return $this->getDbConnection();
}
/**
* @param string Database connection class name to be created.
*/
public function getConnectionClass()
{
return $this->_connClass;
}
/**
* The database connection class name to be created when {@link getDbConnection}
* method is called <b>and</b> {@link setConnectionID ConnectionID} is null. The
* {@link setConnectionClass ConnectionClass} property must be set before
* calling {@link getDbConnection} if you wish to create the connection using the
* given class name.
* @param string Database connection class name.
* @throws TConfigurationException when database connection is already established.
*/
public function setConnectionClass($value)
{
if($this->_conn!==null)
throw new TConfigurationException('datasource_dbconnection_exists', $value);
$this->_connClass=$value;
}
/**
* Finds the database connection instance from the Application modules.
* @param string Database connection module ID.
* @return TDbConnection database connection.
* @throws TConfigurationException when module is not of TDbConnection or TDataSourceConfig.
*/
protected function findConnectionByID($id)
{
$conn = $this->getApplication()->getModule($id);
if($conn instanceof TDbConnection)
return $conn;
else if($conn instanceof TDataSourceConfig)
return $conn->getDbConnection();
else
throw new TConfigurationException('datasource_dbconnection_invalid',$id);
}
}
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