Page 6
SQLSTATE[HY000] [1045] Access denied for user 'app_user'@'localhost' (using password: YES)

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Part 7 of 8 - Getting last insert ID.
Using the lastInsertID() method. Each time this page is opened/refreshed it will
insert a row to the guestbook table then use lastInsertID() to grab the id of the last
inserted ID.