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

Answer 2

Just my 50 cents for this issue, I simply noticed that you won't get a LAST_INSERT_ID greater than 0 if your table has no AUTO_INCREMENT set to an index.

I wasted about half hour on this. Turns out I keep getting a LAST_INSERT_ID() of 0 , which for this table is actually ok.

Answer 3

you have to combine

INSERT INTO test (title) VALUES ('test');SELECT LAST_INSERT_ID();

Then you will get the last insert id

Answer 4

I had the same issue. mysql_insert_id() or LAST_INSERT_ID() returned 0 when requested inside a PHP function with an INSERT query .

I sorted the issue by requesting the value of mysql_insert_id() from a separate PHP function called right after the function that INSERT query .

Answer 5

it work perfectly...try it...

    $result = mysql_query("INSERT INTO `test` (`title`) VALUES ('test')");
    if ($result) {
        $id = mysql_insert_id(); // last inserted id
        $result = mysql_query("SELECT * FROM tablename WHERE id = $id") or die(mysql_error());
        // return user details
        if (mysql_num_rows($result) > 0) {
            return mysql_fetch_array($result);
        } else {
            return false;
        }
    } else {
        return false;
    }