feat: make odbc resultset usable with count()

src/Db/OdbcResultset.php

@@ -1,7 +1,7 @@
 <?php
 namespace Bsr\Db;
 
-class OdbcResultSet implements \Iterator, \ArrayAccess
+class OdbcResultSet implements \Iterator, \ArrayAccess, \Countable
 {
     public $length;
 
@@ -25,6 +25,10 @@ class OdbcResultSet implements \Iterator, \ArrayAccess
         return $this->num_rows;
     }
 
+    public function count() {
+        return $this->get_num_rows();
+    }
+
     public function is_error()
     {
         return ($this->error ? true : false);