PDO Last Insert ID always the right one?

Question

I have the following code:

prepare(\"INSERT INTO a_table (id, a_field) VALUES (\'\', (:a_field)\");
$query->bindParam(\":a_field\",          


        

Answer 1

Just faced following situation

Have file post.php which includes another file (like insert.php).

Whole code to insert in mysql is located in insert.php

In insert.php is code $id_of_inserted_row = $db->lastInsertId();

Then in insert.php is echo $id_of_inserted_row; which shows correct value.

But echo $id_of_inserted_row; in post.php shows incorrect value (as i see shows 7 numbers less than actual value). I do not understand why, just need to take into account.

Update

Sorry, above written was because inserted in two tables and mistakenly used the same $id_of_inserted_row = $db->lastInsertId(); for both tables.

So i have the same conclusion as in other answers: lastInsertId() gets id of last inserted row.

Faced situation. I inserted 2 rows in mysql. In such case i see that lastInsertId() is id of the first inserted row (not the last). Do not understand why... Found answer https://stackoverflow.com/a/12574752/2118559

Important If you insert multiple rows using a single INSERT statement, LAST_INSERT_ID() returns the value generated for the first inserted row only. The reason for this is to make it possible to reproduce easily the same INSERT statement against some other server.