my update query didn't work on Codeigniter - php

Question

I have a table name "Category" which contains (cat_id, name, description). I can insert, retrieve, and delete without any problems. But when I update my Category, no data inserted in my database. I check my table and the result is nothing.
The POST model "Category_Model extends CI_Model":
public function custom_query($data)
{
$q = $this->db->query($data);
return $q;
}
The POST controller "Category extends CI_Controller":
public function edit_category()
{
$data['title'] = "Edit Category Page";
$this->load->view('edit_category', $data);
}
public function update_category()
{
$id = $this->input->post('cat_id'); // I try $id = $this->uri->segment(3); but no result
$name = $this->input->post('name');
$desc = $this->input->post('description');
$this->post_model->custom_query("update category set cat_name='".$name."', description='".$desc."' where cat_id='".$id."'"); // when I delete 'where cat_id='".$id."'' clause, all my records were changing/updating
// I change to $this->db->where('cat_id', $id); $this->db->update('category'), but no result.
redirect ('category/view_categories');
}
Here is my EDIT CATEGORY view:
<form action="<?php echo base_url(); ?>category/update_category" method="POST">
<fieldset>
<legend>Edit Category</legend>
<label for="cat">Name :</label>
<input type="text" name="name"/>
<label for="desc">Descriptions :</label>
<textarea name="description" cols="40" rows="2"></textarea>
<input type="submit" value="Update">
</fieldset>
</form>
Please anyone tell me what was wrong with my code? Thank in advance
best regards.
*note: I put 'database' in autoload config.

Answer 1

First of all, are you sure you writing table name correctly?
..."update kategori..."
If this is ok, try to output your query before sending it to database, like this:
$query = "update kategori set cat_name='".$name."', description='".$desc."' where cat_id='".$id."'";
error_log('My query: ' . print_r($query, true));
$this->post_model->custom_query($query);
Then, if you won't see any problems in that query, give it to us.

Answer 2

It looks like your query might not be getting the cat_id as I don't see it anywhere in the passing view. Try a hidden field in the HTML which contains the cat_id. This might also be easier than trying to get it via URI segments.

Answer 3

You could be learn about CI models, it will simplify your life.
I believe with, for some reason, the redirect could be close your connection before the commit... It doesn't occur if you use the model object.

Answer 4

A little sample for models...
Create a class on application/models, like this
file "category_model.php"... attention for this name, because the CI is very restrictive with model name. Must by equal class name, but all lowercase.
class Category_model extends CI_Model {
// your fields
var $id = null;
var $name = null;
// call parent constructor... it's essential
function __construct() {
parent::__construct();
}
// create a set function, for fill all fields directly from get or post
function set($data) {
$this->id = isset($data['id']) ? $data['id'] : null;
$this->name = isset($data['name']) ? $data['name'] : null;
}
// execute update on database
function update($id) {
$this->db->update('category', $this, array('id' => $this->id));
}
}
on the controller, instance and invoke the model
$this->load->model('Category_Model', null, true);
$this->Category_Model->set($this->post());
$this->Category_Model->update();
after this, proceed you normal code.