PHP와 MySQL로 테이블을 업데이트하고 싶습니다. mysql db에 이미있는 값에서 선택하는 숫자를 더하거나 뺄 필요가 있습니다. "player_qty"에 추가 할 때 작동하지만, 빼거나 삭제할 때는 작동하지 않습니다. 그것은 내가 원하는 메시지를 제공한다. 많은 것이 삭제되었지만 데이터베이스를 점검 할 때, 값은 동일하다. 삭제가 아니다. 당신 빼기 쿼리에서mysql을 PHP로 업데이트하는 방법
$register_query = "SELECT * FROM players WHERE player_id='$add_player_id' AND event_name = '$event_name'";
$register_check = mysql_query($register_query, $db);
$register_found_users = mysql_num_rows($register_check);
if($_POST['button'] == "Add") {
if($register_found_users>0){
mysql_query("UPDATE players
SET
player_qty = player_qty + $add_player_qty,
player_pickedup = '1',
event_user = '$event_user'
WHERE player_id = '$add_player_id'");
$msg = $add_player_qty.' more ticket(s) added to '.$add_player_id.'.';
} else {
$insertSQL1 = "
INSERT INTO players
(player_id, player_qty, player_adt, player_level, player_pickedup, event_name, event_type, event_end, event_user)
VALUES
('$add_player_id', '$add_player_qty', NULL, NULL, '1', '$event_name', '$event_type', '$event_end', '$event_user')";
mysql_select_db($dbname, $db);
$Result1 = mysql_query($insertSQL1, $db) or die(mysql_error());
$msg = $add_player_id.' added to DB w/ '.$add_player_qty.' ticket(s)';
}
}elseif($_POST['button'] == "Delete") {
if($register_found_users>0){
mysql_query("UPDATE players
SET
player_qty = player_qty - $add_player_qty,
player_pickedup = '1',
event_user = $event_user
WHERE player_id = '$add_player_id'");
$msg = $add_player_qty.' ticket(s) deleted from '.$add_player_id.'.';
} else {
$msg = $add_player_id.' not in database. Please add manually.';
}
} else {
//
}
<!-- FORM TO ADD PLAYER TO DATABASE IF DOESN'T EXIST -->
<form action="" method="post" enctype="multipart/form-data" name="form_add_player" id="form_add_player" style="display:<?php echo $css;?>;">
<label for="add_player_id">PLAYER #: </label>
<input type="text" name="add_player_id" id="add_player_id" value=""/>
<label for="add_player_qty">QUANTITY: </label>
<select name="add_player_qty" id="add_player_qty">
<option value="1">1</option>
<option value="2" selected>2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
<input name="event_end" type="hidden" id="event_end" value="<?php echo $row_get_type['event_end'];?>" />
<input type="submit" name="button" value="Add" class="button">
<input type="submit" name="button" value="Delete" class="button">
</form>
변수 ("UPDATE ...")'는 mysql_query'의 결과를 할당하고 그 결과를 확인 오류가 무엇인지 알 수 있습니다. –