更新代码，适配php7.4

thinkphp/library/think/db/Connection.php

@@ -1813,11 +1813,10 @@ abstract class Connection
      * @access public
      * @return integer
      */
-    public function getExecuteTimes()
+    public function getExecuteTimes() 
     {
-        return Db::$executeTimes;
+        return json(['times' => Db::$executeTimes]);
     }
-
     /**
      * 关闭数据库（或者重新连接）
      * @access public