- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我有一个简单测验程序的以下代码,由于某种原因,它无法生成(并存储到数据库)测验 ID 和问题 ID,这意味着答案没有任何引用。
管理面板中的代码是:(我认为错误就在这里,但我不确定)
//inserting the questions into the database
//checking if the required data has been filled
if(isset($_POST['desc'])){
if(!isset($_POST['iscorrect']) || $_POST['iscorrect'] == ""){
echo "Sorry, important data to submit your question is missing. Please press back in your browser and try again and make sure you select a correct answer for the question.";
exit();
}
if(!isset($_POST['type']) || $_POST['type'] == ""){
echo "Sorry, there was an error parsing the form. Please press back in your browser and try again";
exit();
}
//connecting to the database
require_once("scripts/connect_db.php");
//initializing the variables
$question = $_POST['desc'];
$program = $_POST['code_desc'];
$programType = $_POST['prog-lang'];
$answer1 = $_POST['answer1'];
$answer2 = $_POST['answer2'];
$answer3 = $_POST['answer3'];
$answer4 = $_POST['answer4'];
$type = $_POST['type'];
$quizID = $_POST['quizID'];
//replacing everything except 0-9 with nothing as its values are - 1/2/3...
$quizID = preg_replace('/[^0-9]/', "", $quizID);
//replacing everything except a-z with nothing as its values are - mc/tf
$type = preg_replace('/[^a-z]/', "", $type);
//replacing everything except 0-9 & a-z with nothhing as value is - answer1/2/3/4
$isCorrect = preg_replace('/[^0-9a-z]/', "", $_POST['iscorrect']);
//getting and converting strings as they are
$question = htmlspecialchars($question);
$question = mysqli_real_escape_string($con,$question);
$program = htmlspecialchars($program);
$program = mysqli_real_escape_string($con,$program);
$answer1 = htmlspecialchars($answer1);
$answer1 = mysqli_real_escape_string($con,$answer1);
$answer2 = htmlspecialchars($answer2);
$answer2 = mysqli_real_escape_string($con,$answer2);
$answer3 = htmlspecialchars($answer3);
$answer3 = mysqli_real_escape_string($con,$answer3);
$answer4 = htmlspecialchars($answer4);
$answer4 = mysqli_real_escape_string($con,$answer4);
//if its a true/false question, do this-
if($type == 'tf'){
//if any field is null or empty, say sorry
if((!$question) || (!$answer1) || (!$answer2) || (!$isCorrect)){
if($answer1=='0' || $answer2=='0')
{
//do nothing
}else{
echo "Sorry, All fields must be filled in to add a new question to the quiz. Please press back in your browser and try again.";
exit();
}
}
}
//if its a multiple choice question, do this-
if($type == 'mc'){
//if any field is null or empty, say sorry
if((!$question) || (!$answer1) || (!$answer2) || (!$answer3) || (!$answer4) || (!$isCorrect)){
if($question=='0' || $answer1=='0' || $answer2=='0' || $answer3=='0' || $answer4=='0')
{
//do nothing
}else{
echo "Sorry, All fields must be filled in to add a new question to the quiz. Please press back in your browser and try again.";
exit();
}
}
}
//inserting the question and type into table question
$sql = mysqli_query($con,"INSERT INTO questions (quiz_id, question, code, code_type, type) VALUES ('$quizID', '$question', '$program', '$programType', '$type')")or die(mysqli_error());
//lastId is there, so we can insert the id, question_id in our table
$lastId = mysqli_insert_id();
mysqli_query($con,"UPDATE questions SET question_id='$lastId' WHERE id='$lastId' LIMIT 1")or die(mysqli_error());
它应该做什么:(示例)生成的测验 ID
INSERT INTO `quizes` (`id`, `quiz_id`, `quiz_name`, `total_questions`, `display_questions`, `time_allotted`, `set_default`) VALUES
(1, 1, 'LEVEL1(EASY)', 22, 20, 30, 0),
(2, 2, 'LEVEL2(HARD)', 9, 10, 20, 1);
还有问题:(它应该做什么)
INSERT INTO `questions` (`id`, `quiz_id`, `question_id`, `question`, `code`, `code_type`, `type`) VALUES
(1, 1, 1, 'If the output of the question is hai , find the error in the program?', 'main()\r\n { \r\nprintf("\\nab");\r\nprintf("\\bsi");\r\nprintf("\\aha");\r\n\r\n}\r\n', 'cpp', 'mc'),
(2, 1, 2, 'find the output?', 'void main()\n{\nint i=1,y;\ny=i---i---i;\ncout<<y<<â€,â€<<i;\ngetch();\n}\n', 'cpp', 'mc'),
(3, 1, 3, 'find the output?', '#include<stdio.h>\r\n\r\nint main()\r\n{\r\ncharstr[20], *s;\r\nprintf("Enter a string\\n");\r\nscanf("%s", str);\r\n s=str;\r\nwhile(*s != ''\\0'')\r\n {\r\nif(*s >= 97&& *s <= 122)\r\n *s = *s-32;\r\n s++;\r\n }\r\nprintf("%s",str);\r\nreturn0;\r\n}\r\n', 'cpp', 'mc'),
(4, 1, 4, 'find the error', '#include<stdio.h>\r\nint main()\r\n{\r\nint P = 10;\r\nswitch(P)\r\n {\r\ncase10:\r\nprintf("Case 1");\r\n\r\ncase20:\r\nprintf("Case 2");\r\nbreak;\r\n\r\ncase P:\r\nprintf("Case 2");\r\nbreak;\r\n }\r\nreturn0;\r\n}\r\n\r\n', 'cpp', 'mc'),
(5, 1, 5, 'find the correct valid function call...assuming the function exists', '', '', 'mc'),
相反,对于 Quizid 和 QuestionID,它只是在数据库中注册为 0。
任何人都可以为我指明解决此问题的正确方向,或者建议我可以看看其他地方。
下面是插入答案的代码(同样在 admin.php 中)
//if inserting a true/false question, insert answers by this-
if($type == 'tf'){
//if answer1 is marked correct, do this--
if($isCorrect == "answer1"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
//if answer2 is marked correct, do this--
if($isCorrect == "answer2"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
}
//if inserting a multiple choice question, insert answers by this-
if($type == 'mc'){
//if answer1 is marked correct, do this--
if($isCorrect == "answer1"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer3', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer4', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
//if answer2 is marked correct, do this--
if($isCorrect == "answer2"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer3', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer4', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
//if answer3 is marked correct, do this--
if($isCorrect == "answer3"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer3', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer4', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
//if answer4 is marked correct, do this--
if($isCorrect == "answer4"){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer4', '1')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer1', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer2', '0')")or die(mysqli_error());
mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES ('$quizID', '$lastId', '$answer3', '0')")or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
整体表结构
更新:根据下面的评论,还包括添加到测验表中的代码
<?php
include('scripts/connect_db.php');
if(isset($_POST['quizName']) && $_POST['quizName'] != ""
&& isset($_POST['quizTime']) && $_POST['quizTime'] != ""
&& isset($_POST['numQues']) && $_POST['numQues'] != ""){
$qName=mysql_real_escape_string($_POST['quizName']);
$qTime=mysql_real_escape_string($_POST['quizTime']);
$nQues=mysql_real_escape_string($_POST['numQues']);
$qTime = preg_replace('/[^0-9]/', "", $qTime);
$nQues = preg_replace('/[^0-9]/', "", $nQues);
$fetch=mysql_query("SELECT id FROM quizes
WHERE quiz_name='$qName'")or die(mysql_error());
$count=mysql_num_rows($fetch);
if($count!="")
{
$user_msg = 'Sorry, but \ '.$qName.' \ already exists!';
header('location: admin.php?msg='.$user_msg.'');
}else{
mysql_query("INSERT INTO quizes (quiz_name, display_questions, time_allotted)
VALUES ('$qName','$nQues','$qTime')")or die(mysql_error());
$lastId = mysql_insert_id();
mysql_query("UPDATE quizes SET quiz_id='$lastId'
WHERE id='$lastId' LIMIT 1")or die(mysql_error());
$user_msg = 'Quiz, \ '.$qName.' \ has been created!';
header('location: admin.php?msg='.$user_msg.'');
}
}else{
$user_msg = 'Sorry, but Something went wrong';
header('location: admin.php?msg='.$user_msg.'');
}
?>
最佳答案
首先,行数将是数字,因此:
if($count!="")
实际上应该是:
if($count > 0)
接下来,您应该使用 mysqli 扩展或 PDO。 mysql_ 函数已被弃用一段时间,并在较新版本的 PHP 中被完全删除,因此如果您不进行更改,您的代码将会崩溃。
最后,您似乎将“id”作为自动递增主键,但您立即将该值复制到 quiz_id 字段。这会浪费查询并混淆要使用哪个字段的情况。您可能应该摆脱 quiz_id 并使用 if (或将 id 重命名为 quiz_id)
为了获得更好的性能和可靠性,只需向测验名称字段添加唯一索引即可。然后您可以尝试插入到测验表中而不进行名称检查。如果由于名称重复而失败,该错误将告诉您已经有一条具有该名称的记录。然后您可以摆脱额外的 SELECT。
编辑:如果您询问唯一索引部分,基本上在 quiz_name 字段上添加唯一索引的 SQL 是:
ALTER TABLE `quizes`
ADD UNIQUE INDEX `quiz_name` (`quiz_name`);
那么代码将如下所示:
...
$qTime = preg_replace('/[^0-9]/', "", $qTime);
$nQues = preg_replace('/[^0-9]/', "", $nQues);
// End of original code
$result = mysql_query("INSERT INTO quizes (quiz_name,...other fields...) VALUES ('Quiz A',...other values...)");
if(!$result)
{
// Failed to insert new quiz
$error_msg = mysql_error();
// Check the content of the error message
if(strpos($error_msg,"Duplicate entry") !== false)
{
// A quiz with that name already exists, redirect to the admin page with the desired message
}
else
{
// Some other error happened, redirect to the admin page with the desired message
}
}
else
{
// Successful quiz insert
$newQuizID = mysql_insert_id();
echo $newQuizID . "\n";
}
重要提示:我使用“mysql_”函数只是为了与您现在所拥有的保持一致,但是我无法充分强调转换为 mysqli 或 PDO 的重要性。最简单的转换可能是 mysqli,因为语法非常相似。
编辑#2:另外,对插入多项选择答案的代码进行最后一项改进 - 您可以提高 INSERT 性能并简化代码,如下所示:
if($type == 'mc'){
$sql2 = mysqli_query($con,"INSERT INTO answers (quiz_id, question_id, answer, correct) VALUES
('$quizID', '$lastId', '$answer1', '". ($isCorrect == "answer1" ? "1" : "0") ."'),
('$quizID', '$lastId', '$answer2', '". ($isCorrect == "answer2" ? "1" : "0") ."'),
('$quizID', '$lastId', '$answer3', '". ($isCorrect == "answer3" ? "1" : "0") ."'),
('$quizID', '$lastId', '$answer4', '". ($isCorrect == "answer4" ? "1" : "0") ."')") or die(mysqli_error());
$msg = 'Thanks, question no.'.$lastId.' has been added';
header('location: admin.php?msg='.$msg.'');
exit();
}
该代码将使用一次插入多行的 MySQL 功能,以便您只运行一个查询而不是 4 个查询,并且它使用一些基本的 PHP 来为“正确”列选择“1”或“0”适本地。
关于php - 无法生成和插入 quiz_id 和 Question_id,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48251151/
我在 JavaScript 文件中运行 PHP,例如...... var = '';). 我需要使用 JavaScript 来扫描字符串中的 PHP 定界符(打开和关闭 PHP 的 )。 我已经知道使
我希望能够做这样的事情: php --determine-oldest-supported-php-version test.php 并得到这个输出: 7.2 也就是说,php 二进制检查 test.
我正在开发一个目前不使用任何框架的大型 php 站点。我的大问题是,随着时间的推移慢慢尝试将框架融入应用程序是否可取,例如在创建的新部件和更新的旧部件中? 比如所有的页面都是直接通过url服务的,有几
下面是我的源代码,我想在同一页面顶部的另一个 php 脚本中使用位于底部 php 脚本的变量 $r1。我需要一个简单的解决方案来解决这个问题。我想在代码中存在的更新查询中使用该变量。 $name)
我正在制作一个网站,根据不同的情况进行大量 PHP 重定向。就像这样...... header("Location: somesite.com/redirectedpage.php"); 为了安全起见
我有一个旧网站,我的 php 标签从 因为短标签已经显示出安全问题,并且在未来的版本中将不被支持。 关于php - 如何避免在 php 文件中写入
我有一个用 PHP 编写的配置文件,如下所示, 所以我想用PHP开发一个接口(interface),它可以编辑文件值,如$WEBPATH , $ACCOUNTPATH和 const值(value)观
我试图制作一个登录页面来学习基本的PHP,首先我希望我的独立PHP文件存储HTML文件的输入(带有表单),但是当我按下按钮时(触发POST到PHP脚本) )我一直收到令人不愉快的错误。 我已经搜索了S
我正在寻找一种让 PHP 以一种形式打印任意数组的方法,我可以将该数组作为赋值包含在我的(测试)代码中。 print_r 产生例如: Array ( [0] => qsr-part:1285 [1]
这个问题已经有答案了: 已关闭11 年前。 Possible Duplicate: What is the max key size for an array in PHP? 正如标题所说,我想知道
我正在寻找一种让 PHP 以一种形式打印任意数组的方法,我可以将该数组作为赋值包含在我的(测试)代码中。 print_r 产生例如: Array ( [0] => qsr-part:1285 [1]
关闭。这个问题需要多问focused 。目前不接受答案。 想要改进此问题吗?更新问题,使其仅关注一个问题 editing this post . 已关闭 9 年前。 Improve this ques
我在 MySQL 数据库中有一个表,其中存储餐厅在每个工作日和时段提供的菜单。 表结构如下: i_type i_name i_cost i_day i_start i_
我有两页。 test1.php 和 test2.php。 我想做的就是在 test1.php 上点击提交,并将 test2.php 显示在 div 中。这实际上工作正常,但我需要向 test2.php
我得到了这个代码。我想通过textarea更新mysql。我在textarea中回显我的MySQL,但我不知道如何更新它,我应该把所有东西都放进去吗,因为_GET模式没有给我任何东西,我也尝试_GET
首先,我是 php 的新手,所以我仍在努力学习。我在 Wordpress 上创建了一个表单,我想将值插入一个表(data_test 表,我已经管理了),然后从 data_test 表中获取所有列(id
我有以下函数可以清理用户或网址的输入: function SanitizeString($var) { $var=stripslashes($var); $va
我有一个 html 页面,它使用 php 文件查询数据库,然后让用户登录,否则拒绝访问。我遇到的问题是它只是重定向到 php 文件的 url,并且从不对发生的事情提供反馈。这是我第一次使用 html、
我有一个页面充满了指向 pdf 的链接,我想跟踪哪些链接被单击。我以为我可以做如下的事情,但遇到了问题: query($sql); if($result){
我正在使用 从外部文本文件加载 HTML/PHP 代码 $f = fopen($filename, "r"); while ($line = fgets($f, 4096)) { print $l
我是一名优秀的程序员,十分优秀!