5.0**](https://github.com/laravel/laravel/blob/master/.env.example)（在5.5上测试）
DB_CONNECTION=MysqL
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=database1
DB_USERNAME=root
DB_PASSWORD=secret
DB_CONNECTION_SECOND=MysqL
DB_HOST_SECOND=127.0.0.1
DB_PORT_SECOND=3306
DB_DATABASE_SECOND=database2
DB_USERNAME_SECOND=root
DB_PASSWORD_SECOND=secret
'MysqL' => [
'driver' => env('DB_CONNECTION'),
'host' => env('DB_HOST'),
'port' => env('DB_PORT'),
'database' => env('DB_DATABASE'),
'username' => env('DB_USERNAME'),
'password' => env('DB_PASSWORD'),
],
'MysqL2' => [
'driver' => env('DB_CONNECTION_SECOND'),
'host' => env('DB_HOST_SECOND'),
'port' => env('DB_PORT_SECOND'),
'database' => env('DB_DATABASE_SECOND'),
'username' => env('DB_USERNAME_SECOND'),
'password' => env('DB_PASSWORD_SECOND'),
],
在MysqL2如果DB_username和DB_PASSWORD是一样的，那么你可以使用env('DB_USERNAME')它在文件档案化.env的前几行。
shift/laravel-4.2/blob/master/app/config/database.PHP#L47-L86)
return array(
'default' => 'MysqL',
'connections' => array(
# Primary/Default database connection
'MysqL' => array(
'driver' => 'MysqL',
'host' => '127.0.0.1',
'database' => 'database1',
'username' => 'root',
'password' => 'secret'
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
),
# Secondary database connection
'MysqL2' => array(
'driver' => 'MysqL',
'host' => '127.0.0.1',
'database' => 'database2',
'username' => 'root',
'password' => 'secret'
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
),
),
);
要指定使用哪个连接，只需运行connection()方法
Schema::connection('MysqL2')->create('some_table', function($table)
{
$table->increments('id'):
});
$users = DB::connection('MysqL2')->select(...);
$connection在模型中设置变量
class SomeModel extends Eloquent {
protected $connection = 'MysqL2';
}
您还可以通过setConnection方法或on静态方法在运行时定义连接：
class SomeController extends BaseController {
public function someMethod()
{
$someModel = new SomeModel;
$someModel->setConnection('MysqL2'); // non-static method
$something = $someModel->find(1);
$something = SomeModel::on('MysqL2')->find(1); // static method
return $something;
}
}
在尝试与数据库之间的表建立关系时要小心！可以这样做，但可能会带来一些警告，并取决于您拥有的数据库和/或数据库设置。
database-connections)
使用多个连接时，可以 通过 立面上的连接方法进行访问。在 传递给 方法应该对应于您列出的其中一个连接 配置文件：
$users = DB::connection('foo')->select(...);
您还可以在连接实例上使用getPdo方法访问原始的基础PDO实例：
$pdo = DB::connection()->getPdo();
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