Question

How to retrieve last inserted user id? I have to use that user id for inserting that user id into next query that also should be done in this transaction only.
my query:

$db->beginTransaction ();
$sql = $db->query ( "INSERT INTO user( user_id, title)
 VALUES ( :p_user_id, :p_title )",
 array ( 'p_user_id' => '', 'p_title' => $title ) );

Answer 1

You can use this method to retrive the last insert id :

$db->lastInsertId() 

With you code :

$db->beginTransaction ();
$sql = $db->query ( "INSERT INTO user( user_id, title) VALUES ( :p_user_id, :p_title )",
array ( 'p_user_id' => '', 'p_title' => $title ) );
$db->lastInsertId() ;