mysqli_insert

Description

Procedural style:

int mysqli_insert_id ( mysqli link )

Object oriented style (property):

class mysqli {

int insert_id

}

The mysqli_insert_id() function returns the ID generated by a query on a table with a column having the AUTO_INCREMENT attribute. If the last query wasn't an INSERT or UPDATE statement or if the modified table does not have a column with the AUTO_INCREMENT attribute, this function will return zero.

注: Performing an INSERT or UPDATE statement using the LAST_INSERT_ID() function will also modify the value returned by the mysqli_insert_id() function.

返回值

The value of the AUTO_INCREMENT field that was updated by the previous query. Returns zero if there was no previous query on the connection or if the query did not update an AUTO_INCREMENT value.

注: If the number is greater than maximal int value, mysqli_insert_id() will return a string.

范例

例子 1. Object oriented style


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$mysqli->query("CREATE TABLE myCity LIKE City");

$query = "INSERT INTO myCity VALUES (NULL, 'Stuttgart', 'DEU', 'Stuttgart', 617000)";
$mysqli->query($query);

printf ("New Record has id %d.\n", $mysqli->insert_id);

/* drop table */
$mysqli->query("DROP TABLE myCity");

/* close connection */
$mysqli->close();
?>

例子 2. Procedural style


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

mysqli_query($link, "CREATE TABLE myCity LIKE City");

$query = "INSERT INTO myCity VALUES (NULL, 'Stuttgart', 'DEU', 'Stuttgart', 617000)";
mysqli_query($link, $query);

printf ("New Record has id %d.\n", mysqli_insert_id($link));

/* drop table */
mysqli_query($link, "DROP TABLE myCity");

/* close connection */
mysqli_close($link);
?>

上例将输出：

New Record has id 1.

add a note User Contributed Notes

will at phpfever dot com
21-Apr-2006 09:40


I have received many statements that the insert_id property has a bug because it "works sometimes".  Keep in mind that when using the OOP approach, the actual instantiation of the mysqli class will hold the insert_id.  



The following code will return nothing.

<?php

$mysqli = new mysqli('host','user','pass','db');

if ($result = $mysqli->query("INSERT INTO t (field) VALUES ('value');")) {

   echo 'The ID is: '.$result->insert_id;

}

?>



This is because the insert_id property doesn't belong to the result, but rather the actual mysqli class.  This would work:



<?php

$mysqli = new mysqli('host','user','pass','db');

if ($result = $mysqli->query("INSERT INTO t (field) VALUES ('value');")) {

   echo 'The ID is: '.$mysqli->insert_id;

}

?>

matix.bg a gmail
14-Mar-2006 06:56


Some people are wondering how to get the ids of the rows inserted with loop. Here is it:



<?php

// stmt_init ...

for (;;;) {

  // do some things...

  $stmt->execute();

  $ids[] = $mysqli->insert_id;

}

?>

alan at commondream dot net
04-Nov-2004 03:44


I was having problems with getting the inserted id, and did a bit of testing. It ended up that if you commit a transaction before getting the last inserted id, it returns 0 every time, but if you get the last inserted id before committing the transaction, you get the correct value.

add a note