Programmer generally need last insert id for their coding requirement. If you are new in Wordpress and you need to fetch last insert id after insertion. Please follow the code below:
// Define the DB object
global $wpdb;
// Define array of inserted data
$data['first_name'] = $_REQUEST['first_name'];
$data['middle_name'] = $_REQUEST['middle_name'];
$data['last_name'] = $_REQUEST['last_name'];
// Insert data into database
$wpdb->insert('wp_connections', $data);
// Fetch last inserted ID
$lastid = $wpdb->insert_id
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