如何在ZF2中检索插入行的ID？

Question

I am creating a message system in ZF2.

I have a threads table:

id             INT primary key auto_increment
title          TEXT

And a messages table:

message_id     INT PRIMARY KEY auto_increment
thread_id      INT foreign key references threads.id
message        TEXT

(Rows and other referenced tables were left out which are not entirely pertinent to this question.)

In my MessageTable model, it keeps an instance of the ThreadTable. When MessageTable::saveMessage( Message $message ) is called it creates a Thread model and in turn calls ThreadTable::saveThread( Thread $thread ).

Since my Message model requires the thread_id, it needs to know the threads.id we just inserted before I can insert the new message.

I do not know how to retrieve the id that we just inserted. How would I get the last inserted id?

Answer 1

$id = $adapter->getDriver()->getLastGeneratedValue();