Merge pull request #35 from tractorcow/pulls/docs

Updated docs

README.md

@@ -8,19 +8,27 @@ Allows SilverStripe to use SQL Server databases.
 
  * Sean Harvey (Nickname: halkyon)
    <sean (at) silverstripe (dot) com>
+   
+ * Damian Mooyman (@tractorcow)
 
 ## Requirements
 
- * SilverStripe 3.0+
+ * SilverStripe 4+
  * SQL Server 2008, 2008 R2, or 2012.
 
+`mssql` PHP api is no longer supported as of 2.0
+
 ### *nix
 
- * PHP with mssql extension and [FreeTDS](http://freetds.org)
+Linux support is only available via the PDO extension. This requires:
+
+ * [dblib](http://www.php.net/manual/en/ref.pdo-dblib.php)
+ * [FreeTDS](http://freetds.org)
 
 ### Windows
 
- * PHP with [SQL Server Driver for PHP](http://www.microsoft.com/en-us/download/details.aspx?id=20098) "sqlsrv" 3.0+
+On windows you can either connect via PDO or `sqlsrv`. Both options require the
+[SQL Server Driver for PHP](https://msdn.microsoft.com/library/dn865013.aspx?f=255&MSPPError=-2147217396). "sqlsrv" 3.0+
 
 Note: [SQL Server Express](http://www.microsoft.com/express/Database/) can also be used which is provided free by Microsoft. However, it has limitations such as 10GB maximum database storage.
 
@@ -29,7 +37,7 @@ Note: [SQL Server Express](http://www.microsoft.com/express/Database/) can also
 These steps will install the latest SilverStripe stable, along with this module using [Composer](http://getcomposer.org/):
 
  * Install SilverStripe: `composer create-project silverstripe/installer /my/website/folder`
- * Install module: `cd /my/website/folder && composer require silverstripe/mssql "*"`
+ * Install module: `cd /my/website/folder && composer require silverstripe/mssql ^2`
  * Open the SilverStripe installer by browsing to install.php, e.g. **http://localhost/silverstripe/install.php**
  * Select **SQL Server 2008+** in the database list and enter your SQL Server database details
 

_register_database.php

@@ -2,11 +2,13 @@
 
 // PDO connector for MS SQL Server
 /** @skipUpgrade */
+use SilverStripe\MSSQL\MSSQLDatabaseConfigurationHelper;
+
 DatabaseAdapterRegistry::register(array(
 	'class' => 'MSSQLPDODatabase',
 	'title' => 'SQL Server 2008 (using PDO)',
 	'helperPath' => dirname(__FILE__).'/code/MSSQLDatabaseConfigurationHelper.php',
-	'supported' => (class_exists('PDO') && in_array('sqlsrv', PDO::getAvailableDrivers())),
+	'supported' => !!MSSQLDatabaseConfigurationHelper::getPDODriver(),
 	'missingExtensionText' =>
 		'Either the <a href="http://www.php.net/manual/en/book.pdo.php">PDO Extension</a> or 
 		the <a href="http://www.php.net/manual/en/ref.pdo-sqlsrv.php">SQL Server PDO Driver</a> 

code/MSSQLDatabaseConfigurationHelper.php

@@ -65,8 +65,14 @@ class MSSQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper
                     }
                     return null;
                 case 'MSSQLPDODatabase':
+                    $driver = $this->getPDODriver();
+                    if (!$driver) {
+                        $error = 'No supported PDO driver';
+                        return null;
+                    }
+
                     // May throw a PDOException if fails
-                    $conn = @new PDO('sqlsrv:Server='.$databaseConfig['server'], $databaseConfig['username'], $databaseConfig['password']);
+                    $conn = @new PDO($driver.':Server='.$databaseConfig['server'], $databaseConfig['username'], $databaseConfig['password']);
                     if ($conn) {
                         return $conn;
                     } else {
@@ -83,6 +89,23 @@ class MSSQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper
         }
     }
 
+    /**
+     * Get supported PDO driver
+     *
+     * @return null
+     */
+    public static function getPDODriver() {
+        if (!class_exists('PDO')) {
+            return null;
+        }
+        foreach(PDO::getAvailableDrivers() as $driver) {
+            if(in_array($driver, array('sqlsrv', 'dblib'))) {
+                return $driver;
+            }
+        }
+        return null;
+    }
+
     /**
      * Helper function to quote a string value
      *