Question

我知道这个问题，但我似乎无法修复它，我希望有人在这里引导我朝着正确的方向前进，我想做的是检查用户是否已经提交了正确答案在对答案数据库进行检查并将其插入数据库之前的一个问题，只是为了阻止同一个问题被多次回答，我是MYSQLi的新手而且不是很好，还在学习它。

目前我所拥有的是：

$mysqli = new mysqli($host,$username,$password,$database);

if($mysqli -> connect_error)die($mysqli->connect_error);

$questionID = $_POST['id'];
$userAnswer = $_POST['answer'];
$userAnswer = strtolower(trim($userAnswer));
$questionValue = $_POST['qValue'];

$teamName = $_SESSION['user_email'];
$user_id = "SELECT t.teamID,t.questionGroupID FROM team as t WHERE t.teamName ='$teamName'";


$result2 = $mysqli->query($user_id);

    if ($result2->num_rows > 0) {
    // output data of each row
    while($row = $result2->fetch_assoc()) {

        $userID = $row["teamID"];
        }
    }


$query = "SELECT answers FROM answers WHERE questionID=?";
$statement = $mysqli->prepare($query);
$statement ->bind_param('i', $questionID);
$statement->execute();
$statement->bind_result($answer);


//checking the database to see if the current question is there from the current user/teamName
if ($result = mysqli_query($mysqli, "SELECT * FROM submissions where teamID='$teamName' and questionID='$questionID'")) {

    /* determine number of rows result set */
    $row_cnt = mysqli_num_rows($result);


    /* close result set */
    mysqli_free_result($result);
}


/* close connection */
mysqli_close($mysqli);


//checking to see if it returns a result
if(($row_cnt)= 0){
while ($statement->fetch()) {
    if ($answer != $userAnswer) {
        echo '<br><br><div class="alert alert-danger"><h5>
            <strong>Sorry!</strong> the answer is incorrect! Please Try again!.</h5>
            </div>';

        "<h3>Sorry the answer is incorrect! Please Try again!</h3><br>";
        //return to previous Page 
        echo '<a href="./question.php?id=' . $questionID . '" class="btn btn-primary btn-block">Return to Question </a>';
        $statement->free_result();
        $sql = "INSERT INTO `submissions`(`submissionsID`, `teamID`, `questionID`, `answer`,`qValue`,`status`,`timestamp`) VALUES (null,'$teamName','$questionID','$userAnswer','0','Wrong',NOW())";

        if (mysqli_query($mysqli, $sql)) {

        } else {
            echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
        }


    } else {


        echo '<br><br><div class="alert alert-success"><h5>
  <strong>Success!</strong> Correct Answer, Good Luck with the Next </h5>
</div>';
        echo "<a href='questionList.php' class='btn btn-success btn-block'>Continue with other questions! </a>";

        $statement->free_result();

        //MySqli Insert Query

        $sql = "INSERT INTO `submissions`(`submissionsID`, `teamID`, `questionID`, `answer`,`qValue`,`status`,`timestamp`) VALUES (null,'$teamName','$questionID','$userAnswer','$questionValue','Correct',NOW())";

        if (mysqli_query($mysqli, $sql)) {

        } else {
            echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
        }


    }

}    
}else{
        echo '<br><br><div class="alert alert-warning"><h5>
  <strong>Already Answered!</strong> Good Luck with the Next </h5>
</div>';
        echo "<a href='questionList.php' class='btn btn-warning btn-block'>Continue with other questions! </a>";
}

我已经测试了大多数方法，我需要做的是检查当前登录用户是否已正确回答了questionID，我使用num_rows查看它是否大于0，如果是大于0，他们已经回答了。

所以我的问题是，我是否正确接近它，我应该采取什么方法？

Answer 1

这是一个很好的方法。尝试使用

$row_cnt = $result->num_rows;

而不是

$row_cnt = mysqli_numrows($result);

也不要忘记，如果出现任何形式的查询错误，$row_cnt将等于-1，因此您应该在假设所有不是0的值都有效之前检查它。

Answer 2

我建议您查看自然语言处理（NLP）技术。如果你的答案是单一的（一个字）。这种方法还可以。如果您正在处理大于1的n-gram，即长句或段落那么您的方法将无法正常工作。答案可以用不同的方式编写。所以我建议使用一些语义方法，如 LSA （潜在语义分析）或简单的矢量表示模型。

我想不出任何其他方法来解决这个问题。尝试NLP方法。会给你很棒的结果。

Answer 3

我采取了不同的方法试图让它发挥作用，最终让它发挥作用，只是想发布我的解决方案，并感谢大家的帮助。

<?php session_start(); ?>
<!DOCTYPE html>
<html lang="en">

<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">


    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom CSS -->
    <link href="css/modern-business.css" rel="stylesheet">

    <!-- Custom Fonts -->
    <link href="font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">

    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->

    <!--[if lt IE 9]>
        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
        <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->

</head>

<body>

    <!-- Navigation -->
    <?php include_once('navigation.php');

// establishing the MySQLi connection

require_once('connection-test.php');
$mysqli = new mysqli($host,$username,$password,$database);

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$questionID = $_POST['id'];
$userAnswer = $_POST['answer'];
$userAnswer = strtolower(trim($userAnswer));
$questionValue = $_POST['qValue'];

$teamName = $_SESSION['user_email'];
$user_id = "SELECT t.teamID,t.questionGroupID FROM team as t WHERE t.teamName ='$teamName'";


$result2 = $mysqli->query($user_id);

    if ($result2->num_rows > 0) {
    // output data of each row
    while($row = $result2->fetch_assoc()) {

        $userID = $row["teamID"];
        }
    }



$query = "SELECT answers FROM answers WHERE questionID=?";
$statement = $mysqli->prepare($query);
$statement ->bind_param('i', $questionID);

$statement->execute();

$statement->bind_result($answer);

$statement->store_result();


?>

    <div class="container">

    <!-- Page Content -->

        <hr>
<?php 
 if ($result4 = $mysqli->query("SELECT * FROM submissions where teamID='$teamName' and questionID='$questionID'"))
                        {
                                // display records if there are records to display
                                if ($result4->num_rows > 0)

                                {
                        echo '<br><br><div class="alert alert-warning"><h5>
                         <strong>Already Answered!</strong> Good Luck with the Next </h5>
                    </div>';
                        echo "<a href='questionList.php' class='btn btn-warning btn-block'>Continue with other questions! </a>";

                                }
                                // if there are no records in the database, display an alert message
                                else
                                {
                                        while ($statement->fetch()) {
                        if ($answer != $userAnswer) {
                            echo '<br><br><div class="alert alert-danger"><h5>
                                <strong>Sorry!</strong> the answer is incorrect! Please Try again!.</h5>
                                </div>';

                            "<h3>Sorry the answer is incorrect! Please Try again!</h3><br>";
                            //return to previous Page 
                            echo '<a href="./question.php?id=' . $questionID . '" class="btn btn-primary btn-block">Return to Question </a>';
                            $statement->free_result();
                            $sql = "INSERT INTO `submissions`(`submissionsID`, `teamID`, `questionID`, `answer`,`qValue`,`status`,`timestamp`) VALUES (null,'$teamName','$questionID','$userAnswer','0','Wrong',NOW())";

                            if (mysqli_query($mysqli, $sql)) {

                            } else {
                                echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
                            }


                        } else {


                            echo '<br><br><div class="alert alert-success"><h5>
                         <strong>Success!</strong> Correct Answer, Good Luck with the Next </h5>
                        </div>';
                            echo "<a href='questionList.php' class='btn btn-success btn-block'>Continue with other questions! </a>";

                             $statement->free_result();

                             //MySqli Insert Query

                            $sql = "INSERT INTO `submissions`(`submissionsID`, `teamID`, `questionID`, `answer`,`qValue`,`status`,`timestamp`) VALUES (null,'$teamName','$questionID','$userAnswer','$questionValue','Correct',NOW())";

                                if (mysqli_query($mysqli, $sql)) {

                                } else {
                                    echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
                                }


                            }

                    } 

                                }
                        }
                        // show an error if there is an issue with the database query
                        else
                        {
                                echo "<strong>Error:</strong>" . $mysqli->error;
                        }


?>
        <?php include_once('footer.php'); ?>

    </div>
    <!-- /.container -->

    <!-- jQuery -->
    <script src="js/jquery.js"></script>

    <!-- Bootstrap Core JavaScript -->
    <script src="js/bootstrap.min.js"></script>

</body>

</html>

PHP检查表单是否已使用num行提交

3 个答案: