如何在SQL中更新JSON数据扔PHP

Question

i am working on a form which i have to insert a data in sql in Json format . Insert is complete.now the problem is update.

This is my Update model in codeigniter:

public function Update()
            {
                print("<pre>");
                    print_r($_POST);
                    print_r($_REQUEST['Userid']);
                    print("</pre>");
                $jsonData = json_encode($_POST);
                $data2 = array(

                    'form_data' => $jsonData
                );


                $this->db->where($_REQUEST['Userid']);
                $this->db->update('form',$data2);
                return;
            }

my sql table has two field: (1) id (2) form in form i store all form data in json format. i get data on the form page but it didn't update.

Answer 1

$this->db->where($_REQUEST['Userid']);

should instead be

$this->db->where('id',$_REQUEST['Userid']);`

You are missing the column parameter in your where clause