Question

Ran into a bit of trouble when trying to insert records into my DB from my forum

What it does when you create a thread is make an entry into 2 tables. First the forum_threads table with information on the thread title, description, poster, post time, etc. It will use thread_id with AUTO_INTEGER to generate the threads ID.

I then need to get that thread_id from the forum_threads and then put that as the thread_id in the forum_posts table.

I’m not sure if theres anyway I can select a row based on its ID after I just inserted it. Would I just have to select the most recent ID? Would that leave a margin of error? Other thought I had was to select based on user name and post time.

Thoughts?

<?php

if (isset($_POST['submit'])) {
    $thread_sql = "
        INSERT INTO forum_threads (
            user_id,
            forum_id,
            thread_postdate,
            thread_title,
            thread_description,
            thread_icon
        ) VALUES (
            '$_SESSION[user_id]',
            '$_GET[f]',
            '$date',
            '$_POST[topictitle]',
            '$_POST[topicdescription]',
            '$_POST[posticon]'
        )
    ";
    $thread_query = @mysqli_query ($db_connect, $thread_sql);

    $post_sql = "
        INSERT INTO forum_posts (
            user_id,
            thread_id,
            post_message,
            post_date
        ) VALUES (
            '$_SESSION[user_id]',
            '',
            '$_POST[content]',
            '$date'
        )
    ";
    $post_query = @mysqli_query ($db_connect, $post_sql);
}

?>

Answer 1

MySqli_Insert_Id () will return the last auto generated ID. Call this function immediately after you insert your new thread.