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Bug #75719 mysqli_bin_result drops datetime precision
Submitted: 2017-12-21 17:38 UTC Modified: 2021-01-12 19:40 UTC
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: judge2005 at gmail dot com Assigned:
Status: Duplicate Package: MySQLi related
PHP Version: 7.0.26 OS: Red Hat 6.3
Private report: No CVE-ID: None
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From: judge2005 at gmail dot com
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 [2017-12-21 17:38 UTC] judge2005 at gmail dot com
If the mysql bind result mechanism is used to retrieve results from a column that is declared with sub-second precision, the extra precision is lost. This only happens with mysqlnd, not libmysqlclient, and it doesn't happen if fetch_assoc() is called.

Test script:
  datetime_col datetime(3) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;


insert into test values ('2017-12-05 01:02:03.456');
insert into test values ('2017-12-05 07:08:09.000');


$conn = new mysqli($servername, $username, $password, $dbname, $port);
$sql = "SELECT datetime_col from test";
$stmt = $conn->prepare($sql);

while($stmt->fetch()) {

Expected result:
string(23) "2017-12-05 01:02:03.456"
string(23) "2017-12-05 07:08:09.000"

Actual result:
string(19) "2017-12-05 01:02:03"
string(19) "2017-12-05 07:08:09"


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 [2021-01-12 19:40 UTC]
-Status: Open +Status: Duplicate
 [2021-01-12 19:40 UTC]
Duplicate of Bug #76386	Prepared Statement formatter truncates fractional seconds from date/time column

Fixed in PHP 7.3
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Last updated: Sun Dec 05 09:03:36 2021 UTC