Update MysqliDb.php

rawQuery can  gets the number of affected rows.

MysqliDb.php

@@ -335,6 +335,7 @@ class MysqliDb
         }
 
         $stmt->execute();
+        $this->count = $stmt->affected_rows;
         $this->_stmtError = $stmt->error;
         $this->_lastQuery = $this->replacePlaceHolders ($this->_query, $params);
         $res = $this->_dynamicBindResults($stmt);