php - 当我尝试动态插入时，mysql的插入命令不起作用

Question

我想动态地将数据插入到我的 phpmyadmin mysql 数据库中。所以我从用户那里获取值，然后运行 ​​mysqli 的 insert 命令来插入数据。

但是我的插入命令不起作用。这是我的代码:

$rest_name = $_SESSION['rest_name'];

    $order = $_SESSION['order'];
    $user = $_SESSION['username'];
    $bill = $_SESSION['bill'];
    $ctime = date("H:i:s", strtotime($_POST['time']));
        $insert_sql = "INSERT INTO '$rest_name' ('orders','amount',
'time','username')  VALUES('$order', '$bill', '$ctime','$user')';
    echo $insert_sql;
        if(mysqli_query($conn,$insert_sql)){
            echo "done";
        }
            else{
                echo "not done";
            }

我的数据库中有 6 列，但我需要插入 4 列，仅将其他两列设置为默认值。

Answer 1

$insert_sql 末尾缺少引号，请尝试以下操作:

$rest_name = $_SESSION['rest_name'];

$order = $_SESSION['order'];
$user = $_SESSION['username'];
$bill = $_SESSION['bill'];
$ctime = date("H:i:s", strtotime($_POST['time']));
    $insert_sql = "INSERT INTO '$rest_name' ('orders','amount','time','username')  VALUES('$order', '$bill', '$ctime','$user')'";
     echo $insert_sql;
    if(mysqli_query($conn,$insert_sql)){
        echo "done";
    }
        else{
            echo "not done";
        }

另外，用你的方法你可能会遭受sql注入(inject)!尽量避免以这种方式插入数据!您应该像这样插入:

$stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?');
$stmt->bind_param('s', $name);

$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // do something with $row
}