updated to match changes in the WritingInterface

again lots of changes due to white space changes (``git diff -w master | pbcopy``)
```
diff --git a/src/Jackalope/Transport/DoctrineDBAL/Client.php b/src/Jackalope/Transport/DoctrineDBAL/Client.php
index 0ac1faa..4373a31 100644
--- a/src/Jackalope/Transport/DoctrineDBAL/Client.php
+++ b/src/Jackalope/Transport/DoctrineDBAL/Client.php
@@ -406,9 +406,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         // 4. if a reference is in the properties, either update the uuid based on the map if its inside the copied graph or keep it.
         // 5. "May drop mixin types"
 
-        try {
-            $this->conn->beginTransaction();
-
         $query = 'SELECT * FROM phpcr_nodes WHERE path LIKE ? AND workspace_name = ?';
         $stmt = $this->conn->executeQuery($query, array($srcAbsPath . '%', $workspaceName));
 
@@ -426,12 +423,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
                 '   SELECT ?, b.property_name, ?, b.idx, b.data FROM phpcr_binarydata b WHERE b.node_id = ?';
             $this->conn->executeUpdate($query, array($newNodeId, $this->workspaceName, $srcNodeId));
         }
-
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollBack();
-            throw $e;
-        }
     }
 
     /**
@@ -474,9 +465,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         // TODO: Not sure if there are always ALL props in $props, should we grab the online data here?
         // TODO: Binary data is handled very inefficiently here, UPSERT will really be necessary here as well as lazy handling
 
-        $this->conn->beginTransaction();
-
-        try {
         if (!$propsData) {
             $propsData = $this->propsToXML($props);
         }
@@ -531,33 +519,11 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             $this->syncBinaryData($nodeId, $propsData['binaryData']);
         }
 
-            // update foreign keys (references)
         $this->syncForeignKeys($nodeId, $path, $props);
 
-            // Update internal indexes
-            $this->syncInternalIndexes();
-            // Update user indexes
-            $this->syncUserIndexes();
-
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollback();
-            throw $e;
-        }
-
         return $nodeId;
     }
 
-    private function syncInternalIndexes()
-    {
-        // TODO implement syncInternalIndexes()
-    }
-
-    private function syncUserIndexes()
-    {
-        // TODO implement syncUserIndexes()
-    }
-
     private function syncBinaryData($nodeId, $binaryData)
     {
         foreach ($binaryData as $propertyName => $binaryValues) {
@@ -987,18 +953,7 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
              WHERE (path = ? OR path LIKE ?)
                AND workspace_name = ?';
 
-        $this->conn->beginTransaction();
-
-        try {
         $this->conn->executeUpdate($query, $params);
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollBack();
-
-            return false;
-        }
-
-        return true;
     }
 
     /**
@@ -1028,8 +983,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         $dom = new \DOMDocument('1.0', 'UTF-8');
         $dom->loadXml($xml);
 
-        $this->conn->beginTransaction();
-
         $found = false;
         foreach ($dom->getElementsByTagNameNS('http://www.jcp.org/jcr/sv/1.0', 'property') as $propertyNode) {
             if ($propertyName == $propertyNode->getAttribute('sv:name')) {
@@ -1046,12 +999,7 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
                         'DELETE FROM phpcr_nodes_foreignkeys
                          WHERE source_id = ?
                             AND source_property_name = ?';
-                    try {
                         $this->conn->executeUpdate($query, array($nodeId, $propertyName));
-                    } catch (\Exception $e) {
-                        $this->conn->rollBack();
-
-                        return false;
                     }
                 }
                 $propertyNode->parentNode->removeChild($propertyNode);
@@ -1059,7 +1007,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             }
         }
         if (! $found) {
-            $this->conn->rollBack();
             throw new ItemNotFoundException("Node $nodePath has no property $propertyName");
         }
         $xml = $dom->saveXML();
@@ -1067,16 +1014,7 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         $query = 'UPDATE phpcr_nodes SET props = ? WHERE id = ?';
         $params = array($xml, $nodeId);
 
-        try {
         $this->conn->executeUpdate($query, $params);
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollBack();
-
-            return false;
-        }
-
-        return true;
     }
 
     /**
@@ -1101,9 +1039,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             throw new PathNotFoundException("Parent of the destination path '" . $this->getParentPath($dstAbsPath) . "' has to exist.");
         }
 
-        try {
-            $this->conn->beginTransaction();
-
         $query = 'SELECT path, id FROM phpcr_nodes WHERE path LIKE ? OR path = ? AND workspace_name = ? ' . $this->conn->getDatabasePlatform()->getForUpdateSQL();
         $stmt = $this->conn->executeQuery($query, array($srcAbsPath . '/%', $srcAbsPath, $this->workspaceName));
 
@@ -1157,11 +1092,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         $query .= "WHERE id IN (" . $ids . ")";
 
         $this->conn->executeUpdate($query, $values);
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollBack();
-            throw $e;
-        }
     }
 
     /**
@@ -1180,7 +1110,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
          */
 
         // Retrieve an array of siblings names in the original order.
-        $this->conn->beginTransaction();
         $qb = $this->conn->createQueryBuilder();
 
         $qb->select("CONCAT(n.namespace,(CASE namespace WHEN '' THEN '' ELSE ':' END), n.local_name)")
@@ -1225,7 +1154,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             }
         }
 
-        try {
         $values[':absPath'] = $absPath;
         $sql = "UPDATE phpcr_nodes SET sort_order = CASE CONCAT(
           namespace,
@@ -1245,12 +1173,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
         $sql .= " ELSE sort_order END WHERE parent = :absPath";
 
         $this->conn->executeUpdate($sql, $values);
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollBack();
-            throw $e;
-        }
-
     }
 
     /**
@@ -1834,9 +1756,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             return;
         }
 
-        $this->conn->beginTransaction();
-
-        try {
         $this->conn->delete('phpcr_namespaces', array('prefix' => $prefix));
         $this->conn->delete('phpcr_namespaces', array('uri' => $uri));
 
@@ -1845,13 +1764,6 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
             'uri' => $uri,
         ));
 
-            $this->conn->commit();
-        } catch (\Exception $e) {
-            $this->conn->rollback();
-
-            throw $e;
-        }
-
         if (!empty($this->namespaces)) {
             $this->namespaces[$prefix] = $uri;
         }
@@ -1987,7 +1899,24 @@ class Client extends BaseTransport implements QueryTransport, WritingInterface,
     /**
      * {@inheritDoc}
      */
+    public function prepareSave()
+    {
+        $this->conn->beginTransaction();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
     public function finishSave()
     {
+        $this->conn->commit();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function rollbackSave()
+    {
+        $this->conn->rollback();
     }
 }
```