PDO how to make the simplest transaction?

Question

PHP

Simple request:

$b=$pdo->prepare(" INSERT INTO `organization` SET clienttime=:clienttime ");
    $b->bindParam(":clienttime",$data);
    $b->execute();

Now I immediately need to get the ID of the inserted record, but I don't want to rely on LAST_INSERT_ID. Is it possible to somehow reliably find out the id of this particular inserted record, for example, using a transaction?
There is an option with manual locking of the table, but I would like to leave it for the very last option ...

Answer 1

Is it possible to somehow reliably find out the id of this particular inserted record

Yes, it is stored in LAST_INSERT_ID()

The ID that was generated is maintained in the server on a per-connection basis. This means that the value returned by the function to a given client is the first AUTO_INCREMENT value generated for most recent statement affecting an AUTO_INCREMENT column by that client. This value cannot be affected by other clients, even if they generate AUTO_INCREMENT values ​​of their own. This behavior ensures that each client can retrieve its own ID without concern for the activity of other clients, and without the need for locks or transactions.

The documentation says .
There are only a few features worth paying attention to:

... LAST_INSERT_ID() returns a ... value representing the first automatically generated value successfully inserted for an AUTO_INCREMENT column as a result of the most recently executed INSERT statement. The value of LAST_INSERT_ID() remains unchanged if no rows are successfully inserted .

Answer 2

An alternative way to find out the last ID is to choose the maximum ID (do they auto-increment?):
This approach is more rational when there are several inserts, including in transactions.