Im making the user able to sort his own data. Lets say I have multiple animals in each row, with its own Uniqe Id. Then I let the user sort the animals with a number from 1 to x.
So to do this I have to update multiple rows in my sql-table. I made Id
uniqe. And then I tried this sql-sentence (this is what the sql is trying to run, my actual php-code is below this code)
[php] INSERT INTO boka_homeworktasks (Id,Sort) VALUES (29 ,1),(38 ,2),(30 ,3),(31 ,4),(32 ,5),(33 ,6),(34 ,7),(35 ,8),(36 ,9),(37 ,10),(39 ,11),(40 ,12),(41 ,13),(42 ,14),(43 ,15),(44 ,16),(45 ,17) ON DUPLICATE KEY UPDATE Sort=VALUES(1),Sort=VALUES(2),Sort=VALUES(3),Sort=VALUES(4),Sort=VALUES(5),Sort=VALUES(6),Sort=VALUES(7),Sort=VALUES(8),Sort=VALUES(9),Sort=VALUES(10),Sort=VALUES(11),Sort=VALUES(12),Sort=VALUES(13),Sort=VALUES(14),Sort=VALUES(15),Sort=VALUES(16),Sort=VALUES(17); [/php]
actually my code looks like this:
[php]$arrsorter = $_POST["sorter"];
for ($x=0;$x < count($arrsorter);$x++){
$sql_sentence .= '(?,' . ($x + 1) . '),';
array_push($arrparams, $arrsorter[$x] );
$sql_sentence2 .= 'Sort=VALUES('. ($x + 1) .'),';
}
$sql_sentence = 'INSERT INTO boka_homeworktasks (Id,Sort) VALUES '. substr($sql_sentence,0,-1) .' ON DUPLICATE KEY UPDATE '. substr($sql_sentence2,0,-1) . ';' ;
$sql = $conn->prepare($sql_sentence);
$sql->bind_param(str_repeat("i", count($arrparams)), ...$arrparams);
$sql->execute();
[/php]
and I get this errors:
Fatal error: Uncaught Error: Call to a member function bind_param() on boolean in myfile.php:35 Stack trace: #0 {main} thrown in myfile.php on line 35
Line 35 is $sql->bind_param(str_repeat("i", count($arrparams)), ...$arrparams);
I cant see anything I have done wrong, can you? Why cant I update my table?