このエラーが発生します SQLSTATE[21000]: カーディナリティ違反: 1241 オペランドには 1 列を含める必要があります 誰かが理由を理解するのを手伝ってくれますか?
これが私のコードです:
<?php
session_start();
$turk_number ='';
$serial='';
$version='';
if(isset($_POST['turk_number']))
{
$_SESSION['turk_number'] = $_POST['turk_number'];
$turk_number= $_POST['turk_number'];
}
$hostname = "localhost";
$username = "root";
$password = "";
$dbname = "resolver";
try
{
$dbh = new PDO("mysql:host=$hostname;dbname=$dbname", $username, $password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$query1 = "SELECT ((SELECT * FROM participants ORDER BY serial DESC LIMIT 0, 1) % 10) + 1 as version";
//$results = $dbh->query($query1);
$results = $dbh->prepare($query1);
$results->execute();
$serial = $results->fetchColumn(0);
if($test= $results->fetchColumn(1))
{
$version = $test; //last version on record + 1
}
else //if no user ever played any games
{
$version = 1;
}
$query2 = "INSERT INTO participants (version) VALUES (:version, :turk_number)";
$stmt = $dbh ->prepare($query2);
$stmt ->execute(array(':version' => $version,
':turk_number' => $turk_number));
}
catch(PDOException $e)
{
echo $e->getMessage();
}
$_SESSION['serial']= $serial;
$_SESSION['version']=$version;
?>
serial <?php print $serial; ?><br />
version <?php print $version; ?><br />
turk <?php print $turk_number; ?>