在zf2中配置多个数据库

Question

如何在Zend Framework 2中配置（和使用）多个数据库？ 目前我在global.php中有这个：

return array(
    'db' => array(
        'driver'         => 'Pdo',
        'dsn'            => 'mysql:dbname=my_db;host=localhost',
        'driver_options' => array(
            PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
        ),
        'username' => 'user',
        'password' => '******',
    ),
    'service_manager' => array(
        'factories' => array(
            'Zend\Db\Adapter\Adapter' => 'Zend\Db\Adapter\AdapterServiceFactory',
        ),
    ),
);

但我没有看到添加第二个的方法。

Answer 1

如果你看一下Zend \\ Db \\ Adapter \\ AdapterServiceFactory，你会发现你的适配器配置只指向一个键'db' 。 这意味着它构建的适配器将始终使用此（唯一）配置键。

我建议你创建一个如下所示的工厂：

namespace Your\Namespace;

use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
use Zend\Db\Adapter\Adapter;

class MyAdapterFactory implements FactoryInterface
{

  protected $configKey;

  public function __construct($key)
  {
      $this->configKey = $key;
  }

  public function createService(ServiceLocatorInterface $serviceLocator)
  {
      $config = $serviceLocator->get('Config');
      return new Adapter($config[$this->configKey]);
  }
}

在主模块（或任何其他模块）中，将以下内容添加到Module.php文件中，以将适配器工厂声明到Zend Service Manager：

use Your\Namespace\MyAdapterFactory;
use Zend\ModuleManager\Feature\ServiceProviderInterface;

class Module implements ServiceProviderInterface{

//Previous code

public function getServiceConfig()
{
    return array(
        'factories' => array(
            'myadapter1'        => new MyAdapterFactory('dbconfigkey1'),
            'myadapter2'        => new MyAdapterFactory('dbconfigkey2'),
            ),
       );

}

//...

全局配置现在应该如下所示：

return array(
'dbconfigkey1' => array(
    'driver'         => 'Pdo',
    'dsn'            => 'mysql:dbname=my_db;host=localhost',
    'driver_options' => array(
        PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
    ),
    'username' => 'user',
    'password' => '******',
),

'dbconfigkey2' => array(
    'driver'         => 'Pdo',
    'dsn'            => 'mysql:dbname=my_db2;host=localhost',
    'driver_options' => array(
        PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
    ),
    'username' => 'user',
    'password' => '******',
),

);

使用您需要使用服务管理器调用它们的适配器：

$adapter1=$serviceManager->get('myadapter1');
$adapter2=$serviceManager->get('myadapter2');

截至2.2版

抽象服务工厂现在是zf2 Zend \\ Db模块的一部分。 可以在“适配器”子键下添加多个配置键：

'db'=> array(
    'adapters'=>array(
        'adapter' => array(
            'driver'         => 'Pdo',
            'dsn'            => 'mysql:dbname=test;host=localhost',
            'username' => 'readCredential',
            'password' => '****'
        ),
        'adapter2' => array(
            'driver'         => 'Pdo',
            'dsn'            => 'mysql:dbname=test;host=localhost',
            'username' => 'rwCredential',
            'password' => '****'
        ),
    )
),

但是，AbstractServiceFactory需要“手动”添加，因为默认情况下不是这样：

'service_manager' => array(
    'abstract_factories' => array(
            'Zend\Db\Adapter\AdapterAbstractServiceFactory',
    )
),

适配器可以像以前一样访问：

$adapter1=$serviceManager->get('adapter');
$adapter2=$serviceManager->get('adapter2');

从性能角度来看，第二种方法更好：一个对象将被实例化（抽象工厂）以（可能）创建不同的适配器。 而在之前的方法中，每个配置创建一个对象。

Answer 2

我在https://samsonasik.wordpress.com/2013/07/27/zend-framework-2-multiple-named-db-adapter-instances-using-adapters-subkey/上找到了更好的解释

Zend Framework 2.2附带了abstract_factories Zend\\Db\\Adapter\\AdapterAbstractServiceFactory ，它允许我们配置多个命名的DB适配器实例。 这是一步一步做到的：

1. 在'service_manager'键下的'abstract_factories'类型中注册Zend\\Db\\Adapter\\AdapterAbstractServiceFactory 。

   //config/autoload/global.php // .... config / autoload / global.php'service_manager'=> array（'abstract_factories'=> array（'Zend \\ Db \\ Adapter \\ AdapterAbstractServiceFactory'，）的一部分， ）

2. 在config/autoload/global.php “db”键下配置“adapters”子项

//config/autoload/global.php // .... config / autoload / global.php的一部分

'db' => array(
    'adapters' => array(

        'db1' => array(
           'driver'         => 'Pdo',
           'dsn'             => 'mysql:dbname=zf2_staging;host=localhost',
           'driver_options'  => array(
                PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
            ),
        ),

        'db2' => array(
           'driver'         => 'Pdo',
           'dsn'             => 'mysql:dbname=zf2_test;host=localhost',
           'driver_options'  => array(
                PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
            ),
        ),
    ),
),

3. 在config/autoload/local.php “db”键下配置“adapters”子项

//config/autoload/local.php

return array(
    'db' => array(
        'adapters' => array(
            'db1' => array(
                'username' => 'root',
                'password' => '',
            ),
            'db2' => array(
                'username' => 'other_user',
                'password' => 'other_user_passwd',
            ),
        ),
    ),
);

3. 使用'db1'或'db2'作为ServiceManager的数据库适配器调用适配器

   $ SM->获取（ 'DB1'）;

   $ SM-> GET（ 'DB2'）;

如果你需要将$sm->get('Zend\\Db\\Adapter\\Adapter')作为主适配器，'db1'和'db2'作为特定用途的其他适配器，那么你需要直接在db下定义主适配器，所以config/autoload/global.php的config/autoload/global.php如下：

//config/autoload/global.php

return array(
    'db' => array(
        //this is for primary adapter....
        'driver'         => 'Pdo',
        'dsn'             => 'mysql:dbname=zf21_learn;host=localhost',
        'driver_options'  => array(
             PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
         ),

        //other adapter when it needed...
        'adapters' => array(

            'db1' => array(
               'driver'         => 'Pdo',
               'dsn'             => 'mysql:dbname=zf2_staging;host=localhost',
               'driver_options'  => array(
                    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
                ),
            ),
            'db2' => array(
               'driver'         => 'Pdo',
               'dsn'             => 'mysql:dbname=zf2_test;host=localhost',
               'driver_options'  => array(
                    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''
                ),
            ),

        ),
    ),
    'service_manager' => array(
        // for primary db adapter that called
        // by $sm->get('Zend\Db\Adapter\Adapter')
        'factories' => array(
            'Zend\Db\Adapter\Adapter'
                    => 'Zend\Db\Adapter\AdapterServiceFactory',
        ),
        // to allow other adapter to be called by
        // $sm->get('db1') or $sm->get('db2') based on the adapters config.
        'abstract_factories' => array(
            'Zend\Db\Adapter\AdapterAbstractServiceFactory',
        ),
    ),
);

config/autoload/global.local.php应该配置如下：

//config/autoload/local.php

return array(
    'db' => array(
        // for primary db adapter that called
        // by $sm->get('Zend\Db\Adapter\Adapter')
        'username' => 'root',
        'password' => '',

        // to allow other adapter to be called by
        // $sm->get('db1') or $sm->get('db2') based on the adapters config.
        'adapters' => array(
            'db1' => array(
                'username' => 'root',
                'password' => '',
            ),
            'db2' => array(
                'username' => 'other_user',
                'password' => 'other_user_passwd',
            ),
        ),
    ),
);