我使用mysqli

时间：2017-09-28 03:24:18

标签： php mysqli

我是mysqli的新手。我正在使用mysql并在mysqli中转换它。当我的数据库中的数据为空时，错误显示并显示“未定义的变量：candidate_name_5”，但在mysql中，当mydatabase中的数据为空时，它仍然有效。我不知道这个问题是什么。它在mysql中运行良好但在mysqli中有很多错误。请帮我解决问题

 <?php
 require('connection.php');
$connect = mysqli_connect('localhost','root','','smart_id_user');
// retrieving candidate(s) results based on position
if (isset($_POST['monthReport'])){   
/*
$resulta = mysql_query("SELECT * FROM tbCandidates where candidate_name='Luis Nani'");

while($row1 = mysql_fetch_array($resulta))
  {
  $candidate_1=$row1['candidate_cvotes'];
  }
 */
 $monthReport = $_POST['monthReport'];

$results = mysqli_query($connect,"SELECT * FROM voting_tbCandidates where candidate_position='$monthReport'");

$row1 = mysqli_fetch_array($results); // for the first candidate
$row2 = mysqli_fetch_array($results); // for the second candidate
$row3 = mysqli_fetch_array($results);
$row4 = mysqli_fetch_array($results);
$row5 = mysqli_fetch_array($results);
$row6 = mysqli_fetch_array($results);
$row7 = mysqli_fetch_array($results);
$row8 = mysqli_fetch_array($results);
$row9 = mysqli_fetch_array($results);
$row10 = mysqli_fetch_array($results);
$row11 = mysqli_fetch_array($results);
$row12 = mysqli_fetch_array($results);

  if ($row1){
  $candidate_name_1=$row1['candidate_name']; // first candidate name
  $candidate_1=$row1['candidate_cvotes']; // first candidate votes
  }

  if ($row2){
  $candidate_name_2=$row2['candidate_name']; // second candidate name
  $candidate_2=$row2['candidate_cvotes']; // second candidate votes
  }
  if ($row3){
    $candidate_name_3=$row3['candidate_name'];
    $candidate_3=$row3['candidates_cvotes'];

  }
  if($row4){
    $candidate_name_4=$row4['candidate_name'];
    $candidate_4=$row4['candidate_cvotes'];
  }
  if($row5){
    $candidate_name_5=$row5['candidate_name'];
    $candidate_5=$row5['candidate_cvotes'];
  }
  if($row6){
    $candidate_name_6=$row6['candidate_name'];
    $candidate_6=$row6['candidate_cvotes'];
  }
  if($row7){
    $candidate_name_7=$row7['candidate_name'];
    $candidate_7=$row7['candidate_cvotes'];
  }
  if($row8){
    $candidate_name_8=$row8['candidate_name'];
    $candidate_8=$row8['candidate_cvotes'];
  }
  if($row9){
    $candidate_name_9=$row9['candidate_name'];
    $candidate_9=$row9['candidate_cvotes'];
      }
}
   else
        // do nothing
?> 
 <?php
// retrieving positions sql query
 $positions=mysqli_query($connect,"SELECT * FROM voting_tbPositions")
 or die("There are no records to display\n" . mysqli_error()); 
     ?>
  <?php
 session_start();
  //If your session isn't valid, it returns you to the login screen for 
protection//
if(empty($_SESSION['user_id'])){

 }
 ?>

 <?php if(isset($_POST['monthReport']))
 {$totalvotes=$candidate_1+$candidate_2+$candidate_3+$candidate_4;} ?>
 <html><head>
 <div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
   <a href="student.php">HOME</a>
  <a><hr></a>
  <a href="vote.php">VOTE</a>
  <a><hr></a>
  <a href="refresh.php">POLL RESULTS</a>
  <a><hr></a>
  <a href="logout.php">LOGOUT</a>
</div>
<div id="main">
<span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; 
</span>

<script language="JavaScript" src="js/admin.js">
</script>
</head><body bgcolor="tan">
  <center>
 <font color = "white" size="7"> <div id="hihi">ONLINE VOTING SYSTEM</div></font>

 <br><br>

<br>
 <br></center>
 <div id="page">

<div id="header">
 <h1>POLL RESULTS </h1>

  </div>
  <div id="container">
 <table width="420" align="center">
 <form method="POST" action="refresh.php">
 <tr>
    <td>Choose Position</td>
    <td><SELECT name="monthReport" id="monthReport" onchange="form.submit()">
     <OPTION VALUE="select">select
     < ?php 
     //loop through all table rows
     while ($row=mysqli_fetch_array($positions)){
     echo "<OPTION VALUE=$row[position_name]>$row[position_name]"; 

    }
    ?>
   </SELECT></td>

 <script type="text/javascript">
   document.getElementById('month').value = "<?php echo $_POST['monthReport'];?>";
</script>
<?php 
echo '<div id="gitna">';
echo $monthReport;
 echo '</div>';
?>
<?php if(isset($_POST['monthReport'])){echo $candidate_name_1;} ?>:<br>
<img src="images/candidate-1.gif"
width='<?php if(isset($_POST['monthReport'])){ if ($candidate_2 || 
$candidate_1 || $candidate_3 || $candidate_4 || $candidate_5!= 0){echo(100*round($candidate_1/($candidate_2+$candidate_1+$candidate_3+$candidate_4+$candidate_5),5));}} ?>'
 height='20'>
 <?php if(isset($_POST['monthReport'])){ if ($candidate_2 || 
$candidate_1 || $candidate_3 ||$candidate_4 || $candidate_5!= 0)

{echo(100*round($candidate_1/($candidate_2+$candidate_1+$candidate_3+$candidate_4+$candidate_5),5));}} ?>% of <?php if(isset($_POST['monthReport'])){echo $totalvotes;} ?> total votes
<br>    votes <?php if(isset($_POST['monthReport'])){ echo $candidate_1;} ?>
<br>
<br>
    <?php if(isset($_POST['monthReport'])){ echo $candidate_name_2;} ?>:<br>
    <img src="images/candidate-2.gif"
width='<?php if(isset($_POST['monthReport'])){ if ($candidate_2 || $candidate_1 || $candidate_3 || $candidate_4 || $candidate_5!= 0){echo(100*round($candidate_2/($candidate_2+$candidate_1+$candidate_3+$candidate_4+$candidate_5),5));}} ?>'
height='20'>

  <?php if(isset($_POST['monthReport'])){if ($candidate_5 || $candidate_4 || $candidate_3 || $candidate_2 || $candidate_1!=0){echo(100*round($candidate_5/($candidate_5+$candidate_4+$candidate_3+$candidate_2+$candidate_1),5));}} ?>% of <?php if(isset($_POST['monthReport'])){echo $totalvotes;} ?> total votes
  <br>votes <?php if(isset($_POST['monthReport'])){echo $candidate_5;} ?>
  <br>
  <br>


<br>
</div>

</body></html>

1 个答案:

答案 0 :(得分：-1)

我只是添加

 error_reporting(1);

现在一切正常

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