generate a insert statment with hash - php

Question

I want to add my id hashed into my hash column in the same insert. I was thiking about adding a hidden , but I think is not okay , however trigger is not necessary for this job , how can I do it in php without adding a new button?
the query it will be generated depending on id.
where md5(id) then isnert in the column , how can I put all together=
table
id hash
1 27669f3f141da48bfe5e6b7aa37c38f9
add controller
public function addProduct(){
$descripcion = $this->input->post('description');
$cost_price = $this->input->post('cost_price');
$selling_price = $this->input->post('selling_price');
$wprice = $this->input->post('wprice');
$min_stock = $this->input->post('min_stock');
$stock = $this->input->post('stock');
$max_stock = $this->input->post('max_stock');
$data = array(
'hash' => $this->hash_id($descripcion),
'descripcion' => $descripcion,
'precio_compra' => $cost_price,
'precio_venta' => $selling_price,
'precio_mayoreo' => $wprice,
'existencia_minima' => $min_stock,
'existencia' => $stock,
'existencia_maxima' => $max_stock
);
if ($data['existencia'] > $data['existencia_minima']) {
$this->json(array('min_stock' => 'el stock no puede ser mayor al min'));
}elseif ($data['existencia_maxima'] < $data['existencia']) {
$this->json(array('max_stock' => 'el stock no puede ser mayor al max'));
}else{
if (!$this->products->isExistsProduct($data)) {
$this->products->addProduct($data);
$this->json(array('msg' => 'successfully added'));
}else{
$this->json(array('duplicate' => 'product already exists'));
}
}
}
model
public function addProduct($data){
$this->db->insert('storelte_articulos',$data);
}
form
<form id="update_product">
<div class="row">
<div class="form-group">
<div class="col-xs-12">
<label for="description">Name: </label>
<input type="text" class="form-control" id="description" name="description" title="product description" required>
<div>
</div>
</div>
<div class="row">
<div class="form-group">
<div class="col-xs-8 col-sm-6">
<label for="cost_price">Cost Price: </label>
<div class="input-group"> <span class="input-group-addon">$</span>
<input type="text" class="form-control input-group-lg reg_name" id="cost_price" name="cost_price" title="cost_price" placeholder="Last name" required>
</div>
</div>
<div class="col-xs-8 col-sm-6">
<label for="selling_price">Selling price: </label>
<input type="text" class="form-control input-group-lg reg_name" id="selling_price" name="selling_price" title="selling_price" placeholder="Last name" required>
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<div class="col-xs-8 col-sm-6">
<label for="wprice">Wholeprice: </label>
<input type="text" class="form-control" id="wprice" name="wprice" title="wprice" required>
</div>
<div class="col-xs-8 col-sm-6">
<label for="min_stock">Min stock: </label>
<input type="text" class="form-control" id="min_stock" name="min_stock" title="min_stock" required>
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<div class="col-xs-8 col-sm-6">
<label for="stock">Stock: </label>
<input type="text" class="form-control" id="stock" name="stock" title="stock" required>
</div>
<div class="col-xs-8 col-sm-6">
<label for="max_stock">Max stock: </label>
<input type="text" class="form-control" id="max_stock" name="max_stock" title="max_stock" required>
</div>
</div>
</div>
</form>

Answer 1

get the inserted id using this method
$this->db->insert_id()
and updated the data (hash)