What is this, my little brother? Why should I use thinkphp to add a piece of information to the database

What is wrong with thinkphp why I can only add a message to the database

PHP Code

  
  Public Function Insert () {                                            $guest =m ("Author");                $guest->create ();                $guest->add ();                                }

Only the first time can be added to solve

------Solution--------------------
The data cache file is doing the ghost. Because the Create () function automatically creates some PHP files that store the fields, and then does the type validation. At the time of the 2nd create (), if the file exists it will no longer go to the database to find, directly with.
So here's the cache file, after you change the table structure, you must delete ...

General location under project folder: \konakona_app\runtime\data\_fields\ The files under this file are all deleted, and will be recreated automatically.

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