do not force existing snowflake connections to use "native" driver

README.md

@@ -116,11 +116,11 @@ Or final way and dynamicly:
 ]
 ```
 
-When using the PHP `Snowflake_pdo` extension the following options are required:
+When using the PHP `pdo_snowflake` extension the following options are required:
 
 ```php
 'snowflake_pdo' => [
-    'driver' => 'snowflake',
+    'driver' => 'snowflake_native',
     'account' => '{account_name}.eu-west-1',
     'username' => '{username}',
     'password' => '{password}',

src/Flavours/Snowflake/Connector.php

@@ -4,6 +4,7 @@
 
 use PDO;
 use Closure;
+use Exception;
 use LaravelPdoOdbc\ODBCConnector;
 use LaravelPdoOdbc\Contracts\OdbcDriver;
 use LaravelPdoOdbc\Flavours\Snowflake\PDO\Statement;
@@ -24,12 +25,16 @@ class Connector extends ODBCConnector implements OdbcDriver
     public function connect(array $config)
     {
         $connection = null;
-        $usingSnowflakeDriver = $config['driver'] === 'snowflake' && extension_loaded('pdo_snowflake');
+        $usingSnowflakeDriver = $config['driver'] === 'snowflake_native';
 
         // the PDO Snowflake driver was installed and the driver was snowflake, start using snowflake driver.
         if ($usingSnowflakeDriver) {
             $this->dsnPrefix = 'snowflake';
             $this->dsnIncludeDriver = false;
+
+            if (!extension_loaded('pdo_snowflake')) {
+                throw new Exception('Native Snowflake driver pdo_snowflake was not enabled');
+            }
         }
 
         $connection = parent::connect($config);

src/ODBCServiceProvider.php

@@ -5,7 +5,6 @@
 use Illuminate\Database\Connection;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\ServiceProvider;
-use Illuminate\Database\DatabaseManager;
 use LaravelPdoOdbc\Flavours\Snowflake\Connector as SnowflakeConnector;
 
 class ODBCServiceProvider extends ServiceProvider
@@ -19,6 +18,7 @@ public function register()
     {
         Connection::resolverFor('odbc', ODBCConnector::registerDriver());
         Connection::resolverFor('snowflake', SnowflakeConnector::registerDriver());
+        Connection::resolverFor('snowflake_native', SnowflakeConnector::registerDriver());
     }
 
     /**