我得到了这个测试脚本，我现在正在将它转换为pdo但是我需要你们其中一位专业人士的帮助，我需要以一种随机的方式不按顺序显示问题。我需要随机化qnid，但如果我添加ORDER BY qnid RAND（）屏幕上不显示任何记录
这里是来自SQL查询的部分，我假设是提取问题
if(isset($_SESSION['stdname']))
{
$result=executeQuery("select stdanswer,answered from studentquestion where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";");
$r1=mysql_fetch_array($result);
$result=executeQuery("select * from question where testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";");
$r=mysql_fetch_array($result);
}
数据库结构
--
-- Table structure for table `question`
--
CREATE TABLE IF NOT EXISTS `question` (
`testid` bigint(20) NOT NULL DEFAULT '0',
`qnid` int(11) NOT NULL DEFAULT '0',
`question` varchar(500) DEFAULT NULL,
`optiona` varchar(100) DEFAULT NULL,
`optionb` varchar(100) DEFAULT NULL,
`optionc` varchar(100) DEFAULT NULL,
`optiond` varchar(100) DEFAULT NULL,
`correctanswer` enum('optiona','optionb','optionc','optiond') DEFAULT NULL,
`marks` int(11) DEFAULT NULL,
PRIMARY KEY (`testid`,`qnid`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
-- Dumping data for table `question`
--
如果有人能搞清楚，这里是完整的脚本吗？
<?php
error_reporting(0);
session_start();
include_once 'oesdb.php';
$final=false;
if(!isset($_SESSION['stdname'])) {
$_GLOBALS['message']="Session Timeout.Click here to <a href=\"index.php\">Re-LogIn</a>";
}
else if(isset($_REQUEST['logout']))
{
//Log out and redirect login page
unset($_SESSION['stdname']);
header('Location: index.php');
}
else if(isset($_REQUEST['dashboard'])){
//redirect to dashboard
//
header('Location: stdwelcome.php');
}else if(isset($_REQUEST['next']) || isset($_REQUEST['summary']) || isset($_REQUEST['viewsummary']))
{
//next question
$answer='unanswered';
if(time()<strtotime($_SESSION['endtime']))
{
if(isset($_REQUEST['markreview']))
{
$answer='review';
}
else if(isset($_REQUEST['answer']))
{
$answer='answered';
}
else
{
$answer='unanswered';
}
if(strcmp($answer,"unanswered")!=0)
{
if(strcmp($answer,"answered")==0)
{
$query="update studentquestion set answered='answered',stdanswer='".htmlspecialchars($_REQUEST['answer'],ENT_QUOTES)."' where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";";
}
else
{
$query="update studentquestion set answered='review',stdanswer='".htmlspecialchars($_REQUEST['answer'],ENT_QUOTES)."' where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";";
}
if(!executeQuery($query))
{
// to do
$_GLOBALS['message']="Your previous answer is not updated.Please answer once again";
}
closedb();
}
if(isset($_REQUEST['viewsummary']))
{
header('Location: summary.php');
}
if(isset($_REQUEST['summary']))
{
//summary page
header('Location: summary.php');
}
}
if((int)$_SESSION['qn']<(int)$_SESSION['tqn'])
{
$_SESSION['qn']=$_SESSION['qn']+1;
}
if((int)$_SESSION['qn']==(int)$_SESSION['tqn'])
{
$final=true;
}
}
else if(isset($_REQUEST['previous']))
{
// Perform the changes for current question
$answer='unanswered';
if(time()<strtotime($_SESSION['endtime']))
{
if(isset($_REQUEST['markreview']))
{
$answer='review';
}
else if(isset($_REQUEST['answer']))
{
$answer='answered';
}
else
{
$answer='unanswered';
}
if(strcmp($answer,"unanswered")!=0)
{
if(strcmp($answer,"answered")==0)
{
$query="update studentquestion set answered='answered',stdanswer='".htmlspecialchars($_REQUEST['answer'],ENT_QUOTES)."' where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";";
}
else
{
$query="update studentquestion set answered='review',stdanswer='".htmlspecialchars($_REQUEST['answer'],ENT_QUOTES)."' where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";";
}
if(!executeQuery($query))
{
// to do
$_GLOBALS['message']="Your previous answer is not updated.Please answer once again";
}
closedb();
}
}
//previous question
if((int)$_SESSION['qn']>1)
{
$_SESSION['qn']=$_SESSION['qn']-1;
}
}
else if(isset($_REQUEST['fs']))
{
//Final Submission
header('Location: testack.php');
}
?>
<?php
header("Cache-Control: no-cache, must-revalidate");
?>
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Meta Tag -->
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Conducter</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta http-equiv="CACHE-CONTROL" content="NO-CACHE"/>
<meta http-equiv="PRAGMA" content="NO-CACHE"/>
<meta name="ROBOTS" content="NONE"/>
<link rel="stylesheet" type="text/css" href="oes.css"/>
<script type="text/javascript" src="validate.js" ></script>
<script type="text/javascript" src="cdtimer.js" ></script>
<script type="text/javascript" >
<!--
<?php
$elapsed=time()-strtotime($_SESSION['starttime']);
if(((int)$elapsed/60)<(int)$_SESSION['duration'])
{
$result=executeQuery("select TIME_FORMAT(TIMEDIFF(endtime,CURRENT_TIMESTAMP),'%H') as hour,TIME_FORMAT(TIMEDIFF(endtime,CURRENT_TIMESTAMP),'%i') as min,TIME_FORMAT(TIMEDIFF(endtime,CURRENT_TIMESTAMP),'%s') as sec from studenttest where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid'].";");
if($rslt=mysql_fetch_array($result))
{
echo "var hour=".$rslt['hour'].";";
echo "var min=".$rslt['min'].";";
echo "var sec=".$rslt['sec'].";";
}
else
{
$_GLOBALS['message']="Try Again";
}
closedb();
}
else
{
echo "var sec=01;var min=00;var hour=00;";
}
?>
-->
</script>
</head>
<body >
<noscript><h2>For the proper Functionality, You must use Javascript enabled Browser</h2></noscript>
<?php
if($_GLOBALS['message']) {
echo "<div class=\"message\">".$_GLOBALS['message']."</div>";
}
?>
<div id="container"><div class="header">
<img style="margin:10px 2px 2px 10px;float:left;" src="images/logo.gif" alt="OES"/><h3 class="headtext"> </h3>
</div>
<form id="testconducter" action="testconducter.php" method="post">
<div class="menubar" style="text-align:center;">
<h2 style="font-family:helvetica,sans-serif;font-weight:bolder;font-size:120%;color:#fff;padding-top:0.3em;letter-spacing:1px;">Test Conducter</h2>
</div>
<div class="page">
<?php
if(isset($_SESSION['stdname']))
{
$result=executeQuery("select stdanswer,answered from studentquestion where stdid=".$_SESSION['stdid']." and testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";");
$r1=mysql_fetch_array($result);
$result=executeQuery("select * from question where testid=".$_SESSION['testid']." and qnid=".$_SESSION['qn'].";");
$r=mysql_fetch_array($result);
?>
<div class="tc">
<table border="0" width="100%" class="ntab">
<tr>
<th style="width:50%;"><h3><span id="timer" class="timerclass"></span></h3></th>
<th style="width:40%;"><h4 style="color: #af0a36;">Q No: <?php echo $_SESSION['qn']; ?> </h4></th>
<th style="width:40%;"><h4 style="color: #af0a36;"><input type="checkbox" name="markreview" value="mark"> Review</input></h4></th>
</tr>
</table>
<textarea cols="100" rows="8" name="question" readonly style="width:96.8%;text-align:left;margin-left:2%;margin-top:2px;font-size:120%;font-weight:bold;margin-bottom:0;color:#0000ff;padding:2px 2px 2px 2px;"><?php echo htmlspecialchars_decode($r['question'],ENT_QUOTES); ?></textarea>
<table border="0" width="100%" class="ntab">
<tr><td> </td></tr>
<tr><td >1. <input type="radio" name="answer" value="optiona" <?php if((strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"review")==0 ||strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"answered")==0)&& strcmp(htmlspecialchars_decode($r1['stdanswer'],ENT_QUOTES),"optiona")==0 ){echo "checked";} ?>> <?php echo htmlspecialchars_decode($r['optiona'],ENT_QUOTES); ?></input></td></tr>
<tr><td >2. <input type="radio" name="answer" value="optionb" <?php if((strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"review")==0 ||strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"answered")==0)&& strcmp(htmlspecialchars_decode($r1['stdanswer'],ENT_QUOTES),"optionb")==0 ){echo "checked";} ?>> <?php echo htmlspecialchars_decode($r['optionb'],ENT_QUOTES); ?></input></td></tr>
<tr><td >3. <input type="radio" name="answer" value="optionc" <?php if((strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"review")==0 ||strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"answered")==0)&& strcmp(htmlspecialchars_decode($r1['stdanswer'],ENT_QUOTES),"optionc")==0 ){echo "checked";} ?>> <?php echo htmlspecialchars_decode($r['optionc'],ENT_QUOTES); ?></input></td></tr>
<tr><td >4. <input type="radio" name="answer" value="optiond" <?php if((strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"review")==0 ||strcmp(htmlspecialchars_decode($r1['answered'],ENT_QUOTES),"answered")==0)&& strcmp(htmlspecialchars_decode($r1['stdanswer'],ENT_QUOTES),"optiond")==0 ){echo "checked";} ?>> <?php echo htmlspecialchars_decode($r['optiond'],ENT_QUOTES); ?></input></td></tr>
<tr><td> </td></tr>
<tr>
<th style="width:80%;"><h4><input type="submit" name="<?php if($final==true){ echo "viewsummary" ;}else{ echo "next";} ?>" value="<?php if($final==true){ echo "View Summary" ;}else{ echo "Next";} ?>" class="subbtn"/></h4></th>
<th style="width:12%;text-align:right;"><h4><input type="submit" name="previous" value="Previous" class="subbtn"/></h4></th>
<th style="width:8%;text-align:right;"><h4><input type="submit" name="summary" value="Summary" class="subbtn" /></h4></th>
</tr>
</table>
</div>
<?php
closedb();
}
?>
</div>
</form>
</div>
</body>
</html>