如何获取最后插入的ID，然后将其分配给全局变量

Question

I want to get last inserted id, and then assign it to a global variable to use it later.

I'm use callback_after_insert as the following:

$crud->callback_after_insert(array($this, '_callback_get_lastInsertID'));

function _callback_get_lastInsertID($post_array,$primary_key) {
   $this->lastInsertedId = $primary_key;
}

Then, when use the $this->lastInsertedId to get its value, but I do not find any value ​​stored.

function featured_ad_offer() { 
    echo $this->lastInsertedId; 
    @$data['content'] .= $this->load->view('featured_ad_offer', '', true); 
    $this->load->view('index', $data); 
}

There is an error message say Undefined property: Content::$lastInsertedId

Now, how to do that ?

Answer 1

Please try declaring your variable in class (assuming both functions are in the same class) right after "declaring" class itself ie

class Blog extends CI_Controller {
    private $lastInsertedId = NULL;

    public function fcn1() {$this->lastInsertedId = 3.14;}
    public function fcn2() {var_dump($this->lastIndertedId);}

}

If you really mean using it as global variable you need to declare it in CI_Controller , or better yet create file in /core/Public_Controller that extends CI_Controller and let all your controllers be extended not by CI_Controller but Public_Controller therefore you can easily declare variables that are "global".

For more information on extending use this tutorial by Phil .

If you have troubles here is a user guide link .

There is another option (not recommended!) config class ,

$this->config->set_item('item_name', 'item_value'); //setting a config value
$this->config->item('item name'); //accesing config value

Answer 2

maybe you can use this to get the last inserted id

$this->db->insert_id();

store it in the session

$this->load->library('session');
$this>session->set_userdata('last_inserted_id');

and use this session variable in other places

$last_inserted_id = $this->session->userdata('last_inserted_id');

wish this help :D

Answer 3

The solution that you need it can easily be resolved with Codeigniter sessions. So for example, what you can do is:

$crud->callback_after_insert(array($this, '_callback_get_lastInsertID'));

function _callback_get_lastInsertID($post_array,$primary_key) {
   $this->session->set_userdata('last_insert_id', $primary_key);
}

Make sure that you have session class loaded first. The best way to do it is to actually have the sessions library at the autoload.

Now to actually call the last_insert_id again, you can simply do it by calling:

echo $this->session->userdata('last_insert_id');

So in your example you can simple do:

function featured_ad_offer() { 
    echo $this->session->userdata('last_insert_id'); 
    @$data['content'] .= $this->load->view('featured_ad_offer', '', true); 
    $this->load->view('index', $data); 

}