我正在构建一个基本网站,它将提供从MySQL数据库动态生成的测验。基于我当前的数据库架构,我无法理解如何在Quiz Web App中为不同的问题生成“选择”。
这是数据库架构:
CREATE TABLE user (
user_id INT UNSIGNED PRIMARY KEY,
username VARCHAR(32) NOT NULL UNIQUE,
password VARCHAR(128) NOT NULL,
...
) Engine=InnoDB;
CREATE TABLE quiz (
quiz_id INT UNSIGNED PRIMARY KEY,
title VARCHAR(64)
) Engine=InnoDB;
CREATE TABLE question (
question_id INT UNSIGNED PRIMARY KEY,
quiz_id INT UNSIGNED NOT NULL,
question VARCHAR(1024),
FOREIGN KEY (quiz_id) REFERENCES quiz (quiz_id)
) Engine=InnoDB;
CREATE TABLE question_choices (
choice_id INT UNSIGNED PRIMARY KEY,
question_id INT UNSIGNED NOT NULL,
is_correct_choice TINYINT(1),
choice VARCHAR(512),
FOREIGN KEY (question_id) REFERENCES question (question_id)
) Engine=InnoDB;
CREATE TABLE quiz_response (
response_id INT UNSIGNED PRIMARY KEY,
user_id INT UNSIGNED NOT NULL,
question_id INT UNSIGNED NOT NULL,
response INT UNSIGNED NOT NULL,
is_correct TINYINT(1),
answer_time FLOAT,
UNIQUE KEY (user_id, question_id)
FOREIGN KEY (user_id) REFERENCES user (user_id),
FOREIGN KEY (question_id) REFERENCES question (question_id),
FOREIGN KEY (response) REFERENCES question_choices (choice_id),
) Engine=InnoDB;
以下是我目前在quiz.php脚本中生成的代码:
// If this user has never taken this quiz, insert empty responses into the quiz_response table
$query = "SELECT * FROM quiz_response WHERE user_id = '" . $_SESSION['user_id'] . "'";
$data = mysqli_query($dbc, $query);
if (mysqli_num_rows($data) == 0) {
//First grab the list of questions to create empty responses
//Grab all questions from question table
//Rework code in the future to accommodate multiple quizes
$query = "SELECT question_id from question";
$data = mysqli_query($data, $query);
$questionIDs = array();
while ($row = mysqli_fetch_array($data)) {
array_push($questionIDs, $row['question_id']);
}
// Insert empty response rows into the response table, one row per question
foreach ($questionIDs as $question_id) {
$query = "INSERT INTO quiz_response (user_id, question_id) VALUES ('" . $_SESSION['user_id']. "', '$question_id')";
mysqli_query($dbc, $query);
}
}
// If the quiz form has been submitted, write the form responses to the database
if (isset($_POST['submit'])) {
// Write the quiz response rows to the response table
foreach ($_POST as $response_id => $response) {
$query = "UPDATE quiz_response SET response = '$response' WHERE response_id = '$response_id'";
mysqli_query($dbc, $query);
}
echo '<p>Your responses have been saved.</p>
}
// Grab the response data from the database to generate the form
$query = "SELECT qr.response_id, qr.question_id, qr.response, q.question, quiz.quiz " .
"FROM quiz_response AS qr " .
"INNER JOIN question AS q USING (question_id) " .
"INNER JOIN quiz USING (quiz_id) " .
"WHERE qr.user_id = '" . $_SESSION['user_id'] . "'";
$data = mysqli_query($dbc, $query);
$responses = array();
while ($row = mysqli_fetch_array($data)) {
// Pull up the choices for each question
$query2 = "SELECT choice_id, choice FROM question_choice " .
"WHERE question_id = '" . $row['question_id'] . "'";
$data2 = mysqli_query($dbc, $query2);
$choices = array();
while ($row2 = mysqli_fetch_array($data2)) {
array_push($choices, $row2);
}
// Rename choices
// Eventually push choices into $responses array
// array_push($responses, $row);
}
mysqli_close($dbc);
// Generate the quiz form by looping through the response array
echo '<form method="post" action="' . $_SERVER['PHP_SELF'] . '">';
echo '<h2>' . $page_title . '</h2>';
$question_title = $responses[0]['question'];
echo '<label for="' . $responses[0][response_id'] . '">' . $responses[0]['question'] . '</label><br />';
foreach ($responses as $response) {
// Only start a new question if the question changes
if ($question_title != $response['question']) {
$question_title = $response['question'];
echo '<br /><label for="' . $response['response_id'] . '">' . $response['question'] . '</label><br />';
}
// Display the choices
// Choice 1
// Choice 2
// Choice 3
// Choice 4
}
echo '<br /><br />';
echo '<input type="submit" value="Grade Me!" name="submit" />';
echo '</form>';
我无法从question_choice表中提取选项并使用它们来填充表单。我可以将choice_id和choice列放入$responses
数组并在生成表单部分中访问它们而不重命名它们吗?此时我觉得我需要重命名。任何帮助将不胜感激!
答案 0 :(得分:3)
我希望我能正确理解你的问题。您似乎在询问数据的结构,您将如何向用户表示选择。
假设您的question_choice
表中特定问题#27801的选择数据如下所示:
choice_id question_id is_correct_choice choice
1 27801 0 Blue
2 27801 0 Green
3 27801 1 Red
4 27801 0 Shoe
在对数据进行标记后,您可以输出一组选项作为广播组,其中question_id作为组名称的一部分,choice_id
作为单个值:
<input type="radio" name="27801" value="1" /> Blue <br />
<input type="radio" name="27801" value="2" /> Green <br />
<input type="radio" name="27801" value="3" /> Red <br />
<input type="radio" name="27801" value="4" /> Shoe <br />
然后,当提交测验时,您可以通过查看$correct_choice_num
的值来迭代每个选项来确定is_correct_choice
。如果将corrent_choice_num
存储在数据库中,则可以绕过必须执行此迭代,但这可能意味着再增加一个表。
无论如何,一旦您的脚本有$correct_choice_num
,您就可以将其与用户选择的选项进行比较。
if ( $correct_choice_num == $_POST["$question_id"] )
{
// This was the correct choice, do something
}
(进行评分服务器端的好处是用户不能通过查看HTML文档的来源来欺骗以找到正确的选择)
这只是一个让你入门的例子。希望有所帮助!
答案 1 :(得分:0)
选择表格,从question_choice中获取选项 一个MySQL查询,创建行变量,然后回显它们。