How to get the id of a row i've just inserted php/mysql [duplicate]

This question already has answers here: 开发者_Go百科 Closed 10 years ago.

Possible Duplicate:

PHP: how to get last inserted ID of a table?

I'm writing a function to add data do a database, but I then want to immediately use that entry in my code.

I know I could query: SELECT id FROM table ORDER BY id DESC

But I wonder if there's any more direct way of doing it.

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That mostly depends on the interface you're using to access MySQL.

If you're using PDO (recommended), you'd use PDO::lastInsertId(): http://us.php.net/manual/en/pdo.lastinsertid.php

If you're using MySQL, you'd use mysql_insert_id() http://php.net/manual/en/function.mysql-insert-id.php

If you're using MySQLi, you'd use mysqli_insert_id(): http://us.php.net/manual/en/mysqli.insert-id.php

Just simply call whichever function is appropriate right after your INSERT completes.

It's important to note that you likely do not want to fetch id out of the database using SELECT because if you have multiple writers, you may get the id that some other thread inserted. At best, you'll operate on the wrong data, and at worst, you could have serious security issues and/or corruption.

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With PHP you can use mysql_insert_id() function.

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select last_insert_id();

Doc

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Maybe this could help:

Get the Unique ID for the Last Inserted Row

If you insert a record into a table that contains an AUTO_INCREMENT column, you can obtain the value stored into that column by calling the mysql_insert_id() function.