Connecting MongoDB ODM to Magento

Question

I am trying to connect Mongo Doctrine ODM to Magento. I have successfully connected zend with mongodb. and I dont know how to Connect the both. I have placed Mongodb odm in "lib" folder of magento and i am having the Issue of linking the lib to magento. I am trying to "include" the library base class. But the library contains many namespaces. I dont think magento supports namespace. so its showing error. . Helps are highly appreciated. Thanks in advance.

Answer 1

I think this is a very good question, which is connected with how Magento loads classes.

There are no good way to fix that without changing Magento files.

So the main problem is in lib/Varien/Autoload.php

public function autoload($class)
{
    if ($this->_collectClasses) {
        $this->_arrLoadedClasses[self::$_scope][] = $class;
    }
    if ($this->_isIncludePathDefined) {
        $classFile =  COMPILER_INCLUDE_PATH . DIRECTORY_SEPARATOR . $class;
    } else {
        $classFile = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $class)));
    }
    $classFile.= '.php';
    return include $classFile;
}

Varien_Autoload::autoload - this method can only load classes that follow "Pear naming conventions" -- Mage_Core_Model_Config.

But if namespaces are used $class will contain Mage\\Core\\Model\\Config.

So we can add one more check and fix namespace problem

public function autoload($class)
{
    if ($this->_collectClasses) {
        $this->_arrLoadedClasses[self::$_scope][] = $class;
    }
    if ($this->_isIncludePathDefined) {
        $classFile =  COMPILER_INCLUDE_PATH . DIRECTORY_SEPARATOR . $class;
    } else if (strpos($class, "\\") !== false) {
        $classFile = str_replace("\\", DIRECTORY_SEPARATOR, $class);
    } else {
        $classFile = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $class)));
    }
    $classFile.= '.php';
    return include $classFile;
}

Now you can use libraries which use namespaces.

In addition here you will find code changes list to use namespaces in Magento.

Answer 2

try these approach, i was able to use two separate database on single magento setup.

for that you will have to create configuration, follow the steps below.

in app/etc/modules

<?xml version="1.0"?>
<config>
    <modules>
        <Deph_Externaldb>
            <active>true</active>
            <codePool>local</codePool>
        </Deph_Externaldb>
    </modules>
</config>

in app/code/local and be sure to update the database details below here

<?xml version="1.0"?>
<config>
    <modules>
        <Deph_Externaldb>
            <version>0.1.0</version>
        </Deph_Externaldb>
    </modules>
    <global>
        <resources>
            <externaldb_write>
                <connection>
                    <use>externaldb_database</use>
                </connection>
            </externaldb_write>
            <externaldb_read>
                <connection>
                    <use>externaldb_database</use>
                </connection>
            </externaldb_read>
            <externaldb_setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </externaldb_setup>
            <externaldb_database>
                <connection>
                    <host><![CDATA[localhost]]></host>
                    <username><![CDATA[db_username]]></username>
                    <password><![CDATA[db_password]]></password>
                    <dbname><![CDATA[db_name]]></dbname>
                    <model>mysql4</model>
                    <type>pdo_mysql</type>
                    <active>1</active>
                </connection>
            </externaldb_database>
        </resources>
    </global>
</config>

your config is ready, you call use the below connection string to access the db

<?php

    $resource   = Mage::getSingleton('core/resource');
    $conn       = $resource->getConnection('externaldb_read');
    $results    = $conn->query('SELECT * FROM tblName');

    print_r($results)