【发布时间】：2019-01-19 23:46:49
【问题描述】：
我正在做一个程序，每次用户按下“submit”时，我都会尝试保存数据。我已经设法在我的表“answers”中保存了以下列的数据：exercise_id_fk、student_id 和 difficulty_student，但我无法保存列中的数据：choice_answer。每次我尝试保存它时，它都会阻止我保存其他列。我正在尝试将多项选择答案存储在数据库中。你能帮我看看有什么问题吗？
这是我的程序，我试图从多项选择答案中存储在“choice_anser”列中：
<?php
// Start the session
session_start();
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "project";
$conn = new mysqli($servername, $username, $password, $dbname);
/*echo*/ $id=$_GET['id'];
$sql = "SELECT * FROM exercises where exercise_id='$id'";
$result = $conn->query($sql); /*Check connection*/
?>
<div id="centered_B" class="header">
<?php
$row = $result->fetch_assoc();
echo '<h1>' . $row["exercise_id"]. ". " . $row["title"] . '</h1>' . "<br>" . '<p>' . $row["text"] . '</p> <img width="603" height="auto" src="' . $row["image_path"] . '"><br><br>
<form method="post" >
<input type="radio" name="choice" value= "1" /><img src="' . $row["image_path_A"] . '"/><br>
<input type="radio" name="choice" value= "2" /><img src="' . $row["image_path_B"] . '"><br>
<input type="radio" name="choice" value= "3" /><img src="' . $row["image_path_C"] . '"><br>';
echo '</form>';
/*var_dump($id)*/
?>
<br><br><br><!--- Select difficulty --->
<p2>Select difficulty level:</p2>
<form action='' method='post'>
<select name="choose" id="choose">>
<option value="1" <?php if($row["difficulty"]=="1") { echo "selected"; } ?> >1</option>
<option value="2" <?php if($row["difficulty"]=="2") { echo "selected"; } ?> >2</option>
<option value="3" <?php if($row["difficulty"]=="3") { echo "selected"; } ?> >3</option>
<option value="4" <?php if($row["difficulty"]=="4") { echo "selected"; } ?> >4</option>
<option value="5" <?php if($row["difficulty"]=="5") { echo "selected"; } ?> >5</option>
</select>
<br><br><br><!--- Button --->
<!-- <button class="buttonSubmit" >Submit</button>-->
<input type="submit" name="submit" value="Submit">
<button class="buttonNext" >Next Question</button>
</form>
</div><!--- end of centered_B div --->
<?php
if (isset($_POST['submit'])) {
$user_id = $_SESSION['user_id'];
$user_check_query = "SELECT * FROM users WHERE id='$user_id'";
if(isset($_POST['choice'])){
if(isset($_POST['choose'])){
$choice_answer=$_POST['choice'];
$difficulty=$_POST['choose'];
// */$user_id = $_SESSION['user_id'];*/
$query = "INSERT INTO answers (exercise_id_fk, student_id, difficulty_student, choice_answer) VALUES ('$id','$user_id', '$difficulty', '$choice_answer')";
$sql=mysqli_query($conn,$query);
}
}
}
?>
【问题讨论】：