无法生成并插入quiz_id和question_id
我有一个简单的测验程序的代码，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参考。
管理面板中的代码是:(我假设错误在这里，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);
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.
任何人都可以指出我正确的方向来解决这个问题，或者建议我在哪里看看。
下面是插入答案的代码（再次在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='.$msg.'');
exit();
}
整体表格结构
附图：
更新：根据下面的评论，还包括要添加到测验表中的代码
<?php
include('scripts/connect_db.php');
if(isset($_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.'');
}
?>
1 个答案:
答案 0 :(得分：0)
首先，行计数将为数字，因此：
if($count!="")
应该是：
if($count > 0)
接下来，您应该使用mysqli扩展或PDO。 mysql_函数已被弃用了一段时间，并且在较新版本的PHP中被完全删除，因此如果您不进行转换，您的代码将会中断。
最后，你好像有＃34; id＆＃34;作为自动递增主键，但您立即将该值复制到quiz_id字段。这浪费了一个查询，并混淆了使用哪个领域的水域。您应该只是摆脱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，只需在测验名称字段中添加唯一索引即可。然后你可以尝试插入quizes表而不进行名称检查。如果由于名称重复而失败，则错误将告诉您已经存在具有该名称的记录。然后你可以摆脱额外的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将是：
ALTER TABLE `quizes`
ADD UNIQUE INDEX `quiz_name` (`quiz_name`);
然后代码看起来像：
...
$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 $newQuizID . "\n";
}
重要提示：我使用了＆＃34; mysql _＆＃34;功能只是为了与你现在拥有的东西保持一致，但我不能强调转换到mysqli或PDO的重要性。最简单的转换可能是mysqli，因为语法非常相似。
编辑＃2：编辑＃2： 此外，您的代码的另一个最后一个改进是插入多项选择答案 - 您可以增加INSERT性能并简化代码，如下所示：if($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MySQL一次插入多行的功能，以便您只运行一个查询而不是4个，并使用一些基本的PHP来选择＆＃34; 1＆＃34;或＆＃34; 0＆＃34;对于＆＃34;正确＆＃34;专栏。
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