sql - MySQL: LAST_INSERT_ID() returns 0

Question

I've got this test table:

CREATE TABLE IF NOT EXISTS `test` (
    `id` INT(10) AUTO_INCREMENT,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4;

inserting using either of these three

INSERT INTO `test` (`id`) VALUES (NULL);
INSERT INTO `test` (`id`) VALUES (0);
INSERT INTO `test` () VALUES ();

and issuing

SELECT LAST_INSERT_ID();

but the query always results in 0.

PHP's mysql_insert_id and PDO::lastInsertId() yield no result either.

I've been toying with this whole day and can't get it to work. Ideas?

Answer 1

The problem seemed to be in MySQL's phpmyadmin config file PersistentConnections set to FALSE which resulted in a new CONNECTION_ID every time a query was issued - therefore rendering SELECT LAST_INSERT_ID() ineffective.

more info in the subsequent topic Every query creates a new CONNECTION_ID()

Also thanks dnagirl for help