Cakephp 2 multiple DBs

问题

I want to switch DB based on domain, selecting credentials from another DB, but I can't switch..

AppController.php

// Select username, password and database based on domain
$this->Company->find('first', [...]);

if ($company) {
    // Connect to second database, droping connection from first.
    $dataSource = ConnectionManager::getDataSource('default');
    $dataSource->config['login'] = $company['Company']['dbuser'];
    $dataSource->config['password'] = $company['Company']['dbpass'];
    $dataSource->config['database'] = $company['Company']['dbname'];

    /**
     * PROBLEM START HERE:
     * Here, need to use new database settings, and, this case
     * Company table does not exists, but I always get it, so,
     * I think I am connected with the first and not second connection.
     */
    print_r($this->Company->find('first'));
}

How I can correct this?

EDIT

I have tried without success:

ConnectionManager::drop('default');
ConnectionManager::create('default', $settings);

A print_r(ConnectionManager::create('default', $settings)) return:

[... lots of things ... ]
[config] => Array
    (
        [persistent] => 
        [host] => localhost
        [login] => login
        [password] => password
        [database] => database
        [port] => 3306
        [datasource] => Database/Mysql
        [prefix] => 
    )
[... more things ... ]

EDIT 2

Now, I can switch database, but, Company Model always get the old database settings.

FooController.php

<?php
App::uses('AppController', 'Controller');

class FooController extends AppController {
    var $uses = array('Foo', 'Company');

    public function index() {
        echo'<pre>';
        print_r($this->Company->find('first')); // Here I get from old settings
        print_r($this->Foo->find('first')); // Here I gete from new settings
        echo'</pre>';

        $this->layout = false;
        $this->render(false);
    }
}

AppController.php

public function beforeFilter() {
    $company = ClassRegistry::init('Company')->find('first');
    $settings = array(
        'datasource' => 'Database/Mysql',
        'persistent' => false,
        'host' => 'localhost',
        'login' => $company['Company']['dbuser'],
        'password' => $company['Company']['dbpass'],
        'database' => $company['Company']['dbname'],
        'prefix' => ''
    );

    ConnectionManager::getDataSource('default')->disconnect();

    ConnectionManager::drop('default');
    ConnectionManager::create('default', $settings);

    ConnectionManager::getDataSource('default')->connect();
}

回答1:

It looks like you need to dynamically create a config and change configs on-the-fly. I don't know if this will work, but it may lead you to the answer.

First we need to create a config for the datasource to use. For this we can use ConnectionManager::create

Next, we need to change configs on-the-fly and for that we can use Model::setDataSource

I haven't tried, but it looks like it should do. If there are issues, leave a comment so I can update the answer.

Edit: This may not work since every model would need to change the to the new datasource. There is a ConnectionManager::drop() method that you could use to drop the default config and then ConnectionManager::create('default', array(...)); to use a new default perhaps.

回答2:

You can switch databases in your database config file.

Configure your Config/database.php file as follows:

<?php
class DATABASE_CONFIG {

    // config for e.g. localhost
    public $default = array(
        'datasource' => 'Database/Mysql',
        'persistent' => false,
        'host' => 'localhost',
        'login' => 'root',
        'password' => 'xxxxx',
        'database' => 'cake',
        'encoding' => 'utf8'
    );

    // DB config specifically for your domain
    public $domain_x = array(
        'datasource' => 'Database/Mysql',
        'persistent' => false,
        'host' => 'localhost',
        'login' => 'username_at_hosting_provider',
        'password' => '087bJ#ytvh&^YU#T',
        'database' => 'blabla_cake',
        'encoding' => 'utf8'
    );

    public function __construct(){
        // switch config depending on domain / env('HTTP_HOST')
        if(env('HTTP_HOST')=='domain_x.com'){
            $this->default = $this->domain_x;
        }
        // otherwise keep $this->default
    }
}

Edit:

It seems a was a bit too fast answering your question: it does not really cover your question. Sorry!

回答3:

Okay, so I managed to fix this problem creating the __construct function whithin AppModel and put all the code to drop the default datasource and create another with the new config. Something like this:

AppModel.php

public function __construct($id = false, $table = null, $ds = null)
{
    App::uses('CakeSession', 'Model/Datasource');

    parent::__construct($id, $table, $ds);

    if ($this->useDbConfig == 'default') {
        // Change the datasource config
        $user = CakeSession::read('Auth.User');
        $this->changeDataSource($user);
    }
}



public function changeDataSource($config)
{ 
    ...
    ...
    ...
    $dados = array();
    $dados['database']   = $config['titulo_bd'];
    $dados['host']       = $config['host_bd'];
    $dados['login']      = $config['login_bd'];
    $dados['password']   = $config['senha_bd'];
    $dados['datasource'] = 'Database/Mysql';
    $dados['persistent'] = false;
    $dados['prefix']     = '';
    $dados['encoding']   = 'utf8';


    ConnectionManager::create('default', $dados);
    ConnectionManager::getDataSource('default')->connect();
}

回答4:

My case is very similar. In my case, I have two types of connections. One is the default core connection which uses the Config/database.php file for connection configurations. Second one is a dynamic configuration which uses db details saved for logged in user. So, for a few specific actions I have to switch between the default db connection and user based db connection. Here's how it came up.

To switch to user based db connection from default file

try {
  ConnectionManager::getDataSource('default')->disconnect();
  ConnectionManager::drop('default');
  ConnectionManager::create('default', $this->config);
  ConnectionManager::getDataSource('default')->connect();
  $db = ConnectionManager::getDataSource('default');
} catch (MissingDatabaseException $e) {
  $this->Session->setFlash($e->getMessage()); 
}

where $this->config is user based connection.

To switch back to default file based connection I do:

try {
  ConnectionManager::getDataSource('default')->disconnect();
  ConnectionManager::drop('default');
  $dbconfig = new DATABASE_CONFIG();
  ConnectionManager::create('default', $dbconfig->default);
  ConnectionManager::getDataSource('default')->connect();
  $db = ConnectionManager::getDataSource('default');
}

where $dbconfig->default i.e. $default contains my default connection configuration in Config/database.php

来源：https://stackoverflow.com/questions/11942189/cakephp-2-multiple-dbs