如何使用CodeIgniter的URL参数将项目插入数据库？

I'm using CodeIgniter to get JSON items from a database and also insert them. I originally created it following the tutorial on the CodeIgniter site, which uses a form to send data to the database, and that worked correctly. I'm attempting to amend this code so that you can write to the database by putting the field values in the URL string. So, to GET data, it's I'm using CodeIgniter to get JSON items from a