diff --git a/MysqliDb.php b/MysqliDb.php
index f4bfa6d3..4f9d5f32 100644
--- a/MysqliDb.php
+++ b/MysqliDb.php
@@ -887,7 +887,7 @@ public function orderBy($orderByField, $orderbyDirection = "DESC", $customFields
 
         if (is_array($customFields)) {
             foreach ($customFields as $key => $value) {
-                $customFields[$key] = preg_replace("/[^-a-z0-9\.\(\),_`]+/i", '', $value);
+                $customFields[$key] = preg_replace("/[^-a-z0-9\.\(\),_` ]+/i", '', $value);
             }
 
             $orderByField = 'FIELD (' . $orderByField . ', "' . implode('","', $customFields) . '")';
@@ -1265,7 +1265,11 @@ public function _buildDataPairs($tableData, $tableColumns, $isInsert)
             $value = $tableData[$column];
 
             if (!$isInsert) {
-                $this->_query .= "`" . $column . "` = ";
+                if(strpos($column,'.')===false) {
+                    $this->_query .= "`" . $column . "` = ";
+                } else {
+                    $this->_query .= str_replace('.','.`',$column) . "` = ";
+                }
             }
 
             // Subquery value
diff --git a/dbObject.php b/dbObject.php
index 29fafdd4..ef6b70df 100644
--- a/dbObject.php
+++ b/dbObject.php
@@ -401,11 +401,15 @@ private function join ($objectName, $key = null, $joinType = 'LEFT', $primaryKey
         $joinObj = new $objectName;
         if (!$key)
             $key = $objectName . "id";
-	if (!$primaryKey)
-            $primaryKey = $joinObj->primaryKey;
+
+        if (!$primaryKey)
+            $primaryKey = MysqliDb::$prefix . $joinObj->dbTable . "." . $joinObj->primaryKey;
 		
-        $joinStr = MysqliDb::$prefix . $this->dbTable . ".{$key} = " .
-                    MysqliDb::$prefix . "{$joinObj->dbTable}.{$primaryKey}";
+        if (!strchr ($key, '.'))
+            $joinStr = MysqliDb::$prefix . $this->dbTable . ".{$key} = " . $primaryKey;
+        else
+            $joinStr = MysqliDb::$prefix . "{$key} = " . $primaryKey;
+
         $this->db->join ($joinObj->dbTable, $joinStr, $joinType);
         return $this;
     }