zf2 dynamic database connection (with parameters) - php

Question

I'm trying to create a ZF2 application with multiple databases. Based on a user, the database should be dynamically set.
Right now I've the following:
database.local.php
return array(
'db' => array(
'adapters' => array (
'master_db' => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=master_db;host=localhost',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
'username' => 'USERNAME',
'password' => 'PASSWORD'
),
'tentant_db' => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=tenant_db;host=localhost',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
'username' => 'USERNAME',
'password' => 'PASSWORD'
),
)
),
'service_manager' => array(
'abstract_factories' => array(
'Zend\Db\Adapter\AdapterAbstractServiceFactory',
)
),
);
For test purposes I've created a form that has a method to fetch some data and put it in a select box. The code to get the database connection is shown in the code below.
MyController.php (in some module)
//... some code
public function someAction(){
$dbAdapter = $this->getServiceLocator()->get('tentant_db');
$form = new AddEolConnectorForm($dbAdapter);
$viewModel = new ViewModel(array(
'form' => $form
));
return $viewModel;
}
//... some more code
My question is, how can I dynamically set the dbname for the tentant_db adapter in my controller (or module)?
Thanks for your help.

Answer 1

The config merge event is one of zend newer event's I believe. It triggers when zend is mergin the config array's which is perfect for the problem you are facing since you can override some array key's dynamically.
public function onMergeConfig(ModuleEvent $e)
{
$configListener = $e->getConfigListener();
$config = $configListener->getMergedConfig(false);
// I'm actually not sure if you have the route match here otherwise you may have to
// use some other method to retrieve the url.
$match = $e->getRouteMatch();
switch ($match) {
case 'first-dependency':
$config['db']['adapter'] => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=master_db;host=localhost',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
'username' => 'USERNAME',
'password' => 'PASSWORD',
),
break;
case 'second-dependency':
$config['db']['adapter'] => array(
'driver' => 'Pdo',
'dsn' => 'mysql:dbname=tenant_db;host=localhost',
'driver_options' => array(
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
),
'username' => 'USERNAME',
'password' => 'PASSWORD',
),
break;
// Pass the changed configuration back to the listener:
$configListener->setMergedConfig($config);
}

Answer 2

Based on the above answer I've created to following:
Module.php
class Module implements AutoloaderProviderInterface
{
public function init(ModuleManager $moduleManager)
{
$events = $moduleManager->getEventManager();
// Registering a listener at default priority, 1, which will trigger
// after the ConfigListener merges config.
$events->attach(ModuleEvent::EVENT_MERGE_CONFIG, array($this, 'onMergeConfig'));
}
public function onMergeConfig(ModuleEvent $e)
{
$db = $this->getTentantDb();
$configListener = $e->getConfigListener();
$config = $configListener->getMergedConfig(false);
$config['db']['adapters']['tenant_db']['dsn'] = 'mysql:dbname='. $db .';host=localhost';
$configListener->setMergedConfig($config);
}
// Some more code
public function getTenantDb(){
$tenant_db = 'tenant_12345'
return $tenant_db;
}
}
I don't know if it is the best solution, but the above code is working. I think the next steps should be to put the code in a generic module or something so I can access it from all my modules.