Bug #80908 [Ver]: pdo_mysql function lastInsertId() return wrong.
Edit report at https://bugs.php.net/bug.php?id=80908&edit=1
ID: 80908
Updated by: twosee@php.net
Reported by: atlanticfeng at icloud dot com
Summary: pdo_mysql function lastInsertId() return wrong.
Status: Verified
Type: Bug
Package: PDO MySQL
Operating System: Ubuntu 18.04
PHP Version: master-Git-2021-03-26 (Git)
Block user comment: N
Private report: N
New Comment:
That's an interesting problem, I even found that Navicat also has a similar problem.
Due to the MySQL protocol does not provide sign-bit information of lastInsertId, we can only support
one type here, supporting unsigned type does look better to me. Although we can create a negative id
in MySQL, it is interesting to note that we can not set AUTO_INCREMENT to a negative value, and I am
sure that most people never use a negative value as an insert ID... (Of course, generally speaking,
I also think it is difficult to exceed INT64_MAX...)
BTW, open a pull request on Github is better (at least for me), and php_pdo_int64_to_str was
replaced by zend_i64_to_str on the master branch [1].
[1] <https://github.com/php/php-src/commit/65a5c184d75127c1376df697748319cce32569cf>
Previous Comments:
------------------------------------------------------------------------
[2021-04-16 07:45:22] nikic@php.net
The following pull request has been associated:
Patch Name: :bug: Fixed Bug #80908 PDO::lastInsertId() return wrong.
On GitHub: https://github.com/php/php-src/pull/6810
Patch: https://github.com/php/php-src/pull/6810.patch
------------------------------------------------------------------------
[2021-03-26 07:10:18] atlanticfeng at icloud dot com
Description:
------------
- Latest or earlier version has this problem.
- My tests version is PHP-master-Git-2021-03-26(Git).
- In php, i use the pdo method: PDO::lastInsertId(), when MySQL table's auto_increment id
bigger than int64, eg: 10376293541461622848, the method return a wrong result, is's like return
'-8070450532247928768'.
- It's because the static zend_string *pdo_mysql_last_insert_id(pdo_dbh_t *dbh, const
zend_string *name) use funtion php_pdo_int64_to_str(int64_t i64) to convert the
mysql api funciton last_insert_id(), it should use uint64_t.
- In MySQL Reference Manual, last_insert_id With no argument, LAST_INSERT_ID() returns
a BIGINT UNSIGNED (64-bit), With an argument, LAST_INSERT_ID() returns an unsigned integer.
Is'a always greater than zero.
Test script:
---------------
<?php
try {
// My localhost mysql server, version is 5.7.0
$dbh = new PDO('mysql:127.0.0.1:33060;dbname=test', 'root',
'secret');
// In table foo, have 2 columns, primary key id
auto_increment=10376293541461622848, name is a varchar(20)
$dbh->exec("insert into foo (name) values ('bar')");
echo $dbh->lastInsertId() . PHP_EOL;
} catch( PDOExecption $e ) {
print "Error!: " . $e->getMessage() . "</br>";
}
Expected result:
----------------
return "10376293541461622849"
Actual result:
--------------
return "-8070450532247928768"
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=80908&edit=1
Thread (6 messages)