diff --git a/library/think/db/Connection.php b/library/think/db/Connection.php
index e9cfb19f..b2d6a305 100644
--- a/library/think/db/Connection.php
+++ b/library/think/db/Connection.php
@@ -741,7 +741,10 @@ abstract class Connection
      */
     public function close()
     {
-        $this->linkID = null;
+        $this->linkID    = null;
+        $this->linkWrite = null;
+        $this->linkRead  = null;
+        $this->links     = [];
     }
 
     /**