Question

我正在尝试更新一条记录，然后一次删除另一条记录，但它只允许我做一个或另一个;

$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";

我如何做到这两点？我尝试了以下内容;

$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update = "DELETE FROM playeritems WHERE id = '$realid'";

__

$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user' DELETE FROM playeritems WHERE id = '$realid'";

__

完整代码：

if ($_SERVER['REQUEST_METHOD'] = $_POST AND isset($_POST['sell'])) {
$sql = "SELECT felcredits FROM user WHERE username = '$user'";
$result = $db_conn->query($sql);
if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        $felcredits = $row['felcredits'];
    }
}
$value = $felcredits + $value;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";
if ($db_conn->query($update) === TRUE) {
    echo "<br />Details Updated";
} else {
    echo "Error: " . $insert . "<br>" . $db_conn->error;
}

}

Answer 1

问题在于：

$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update = "DELETE FROM playeritems WHERE id = '$realid'";

您的第二个SQL查询将覆盖第一个，因此请单独进行查询：

$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
mysqli_query($conn, $update);

$delete = "DELETE FROM playeritems WHERE id = '$realid'";
mysqli_query($conn, $delete);

其中$ conn是连接句柄

Answer 2

您尝试更改完整代码，例如

在您的执行代码

中

if ($_SERVER['REQUEST_METHOD'] = $_POST AND isset($_POST['sell'])) {
 $sql = "SELECT felcredits FROM user WHERE username = '$user'";
$result = $db_conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
    $felcredits = $row['felcredits'];
}
}       
$value = $felcredits + $value;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";
if (($db_conn->query($update) === TRUE) && ($db_conn->query($update2) ===     TRUE)) {
echo "<br />Details Updated";
} else {
echo "Error: " . $insert . "<br>" . $db_conn->error;
}
}

更新记录然后删除

2 个答案: