Php 在zf2中配置多个数据库

如何在Zend Framework 2中配置（和使用）多个数据库？目前，我的global.php中有以下内容：

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',
        ),
    ),
);

---

但是我没有看到添加第二个键的方法。

如果您查看Zend\Db\Adapter\AdapterServiceFactory，您将看到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）配置密钥

我建议您创建自己的工厂，如下所示：

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，以向Zend Service Manager声明适配器工厂：

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'),
            ),
       );

}

//...

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

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' => '******',
),

);

要使用适配器，您需要使用服务管理器调用它们：

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'),
            ),
       );

}

//...

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

从2.2版开始 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，因为默认情况下并非如此：

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

如前所述，可以访问适配器：

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

---

从性能角度来看，第二种方法更好：将实例化一个对象（抽象工厂），以（可能）创建不同的适配器。而在前面的方法中，每个配置创建一个对象。

我发现对

Zend Framework 2.2附带了抽象工厂

Zend\Db\Adapter\Adapter\AdapterAstractServiceFactory

，允许我们配置多个命名的Db适配器实例。这是一步一步完成的：

在“服务管理器”键下的“抽象工厂”类型处注册

Zend\Db\Adapter\Adapter\AdapterAstractServiceFactory

//config/autoload/global.php //.... config/autoload/global.php的一部分 “服务管理器”=>数组（ “抽象工厂”=>数组( “Zend\Db\Adapter\AdapterAstractServiceFactory”， ), ),

在

config/autoload/global.php的'db'键下配置'adapters'子键

//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\''
            ),
        ),
    ),
),

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',
        ),
    ),
);

在

config/autoload/local.php的'db'键下配置'adapters'子键

//config/autoload/local.php

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

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',
            ),
        ),
    ),
);

从ServiceManager使用“db1”或“db2”作为db适配器调用适配器

$sm->get（'db1'）

$sm->get（'db2'）

如果需要将

$sm->get（'Zend\Db\Adapter\Adapter'）

作为主适配器，将'db1'和'db2'作为特定用途的其他适配器，则需要直接在Db下定义主适配器，因此

config/autoload/global.php的配置如下所示：

//config/autoload/global.php

'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\''
            ),
        ),
    ),
),

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
的配置也应如下所示：

//config/autoload/local.php

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

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',
            ),
        ),
    ),
);

这种策略在2.1中有没有改变？在快速浏览Zend\Db\Adapter\AdapterServiceFactory之后，我不这么认为。