remove IDb interface from core class usage

lib/private/server.php

@@ -77,7 +77,7 @@ class Server extends SimpleContainer implements IServerContainer {
 			return new PreviewManager();
 		});
 		$this->registerService('TagMapper', function(Server $c) {
-			return new TagMapper($c->getDb());
+			return new TagMapper($c->getDatabaseConnection());
 		});
 		$this->registerService('TagManager', function (Server $c) {
 			$tagMapper = $c->query('TagMapper');

lib/private/tagging/tagmapper.php

@@ -22,7 +22,7 @@ namespace OC\Tagging;
 
 use \OCP\AppFramework\Db\Mapper,
     \OCP\AppFramework\Db\DoesNotExistException,
-    \OCP\IDb;
+    \OCP\IDBConnection;
 
 /**
  * Mapper for Tag entity
@@ -32,9 +32,9 @@ class TagMapper extends Mapper {
 	/**
 	* Constructor.
 	*
-	* @param IDb $db Instance of the Db abstraction layer.
+	* @param IDBConnection $db Instance of the Db abstraction layer.
 	*/
-	public function __construct(IDb $db) {
+	public function __construct(IDBConnection $db) {
 		parent::__construct($db, 'vcategory', 'OC\Tagging\Tag');
 	}
 

tests/lib/tags.php

@@ -49,7 +49,7 @@ class Test_Tags extends \Test\TestCase {
 			->will($this->returnValue($this->user));
 
 		$this->objectType = $this->getUniqueID('type_');
-		$this->tagMapper = new OC\Tagging\TagMapper(\OC::$server->getDb());
+		$this->tagMapper = new OC\Tagging\TagMapper(\OC::$server->getDatabaseConnection());
 		$this->tagMgr = new OC\TagManager($this->tagMapper, $this->userSession);
 
 	}