更新と挿入クエリがPHPから機能していません

Question

更新と挿入クエリが機能していないため、現在選択されていません。ここ

は、以下の私のコードは、エラーで私を助けてください...

<?php 
    if(isset($_POST['save'])){ 
     $exam_type=$_POST['exam_type']; 
     $exam_from=$_POST['exam_from']; 
     $exam_to=$_POST['exam_to']; 
     $total_points=$_POST['total_points']; 
     $passing_grade=$_POST['passing_grade']; 
     $time_limit=$_POST['hrs']*360 + $_POST['min']*60; 
     $cid=$_GET['cid']; 

     $sql = $con->prepare("UPDATE new_oes.exam" 
     . " SET exam_type=?,exam_from =?, exam_to=?," 
     . "modified_by=?,passing_score=?, time_limit=?,passing_grade=? " 
     . "WHERE exam_type = ? AND cid =? "); 

     $sql->execute(array($exam_type, $exam_from, $exam_to, $username, 
     $total_points, $time_limit, $passing_grade, $exam_type,$cid)) or die(mysqli_error($con)); 

     // echo $result1; 
     // $this->query($sql); 
     if(mysqli_affected_rows($con)>0){ 
      echo "<script type='text/javascript'>alert('Exam Updated!!!')</script>"; 
      exit; 
     } else{ 
      echo "An error occurred, try again later!!!"; 
     } 
    } 
?> 

です！

注：クエリはphpmyadminの

Answer 1

から取り組んでいる、それはだ$usernameが定義されていないようです、あなたは通常、あなたが前にSQL文をprepareしようとしてからの戻り値をチェックしたいと思う$username

$username = "SOME_ONE"; // maybe you saved it in $_SESSION or its in $_POST 

Answer 2

を定義する必要がありますクエリを実行しようとしました。

<?php 
    try{ 
     if(isset( 
      $_POST['save'], 
      $_POST['exam_type'], 
      $_POST['exam_from'], 
      $_POST['exam_to'], 
      $_POST['total_points'], 
      $_POST['passing_grade'], 
      $_POST['hrs'], 
      $_GET['cid'], 
      $_GET['username']) 
     ){ 

      $exam_type=$_POST['exam_type']; 
      $exam_from=$_POST['exam_from']; 
      $exam_to=$_POST['exam_to']; 
      $total_points=$_POST['total_points']; 
      $passing_grade=$_POST['passing_grade']; 
      $time_limit=$_POST['hrs']*360 + $_POST['min']*60; 
      $cid=$_GET['cid']; 
      $username=$_GET['username']; 

      $stmt = $con->prepare("update `new_oes`.`exam` 
       set `exam_type`=?, `exam_from` =?, `exam_to`=?, `modified_by`=?, `passing_score`=?, `time_limit`=?, `passing_grade`=? 
       where `exam_type` = ? and `cid` =? "); 

      if($stmt){ 
       /* 
        Assumed to be that all parameters are strings apart from $cid which I took to be an integer 
        Change each letter in first parameter of `bind_param` accoring to whether the input variable is 
        either string or numeric. 

        s=string 
        i=integer 
       */ 

       $stmt->bind_param('ssssssssi', $exam_type, $exam_from, $exam_to, $username, $total_points, $time_limit, $passing_grade, $exam_type, $cid); 
       $stmt->execute(); 

       if($stmt->affected_rows > 0){ 
        exit("<script>alert('Exam Updated!!!')</script>"); 
       } else{ 
        throw new Exception('An error occurred, try again later!!!'); 
       }    

      } else { 
       throw new Exception('Failed to prepare SQL statement!'); 
      } 
     } else { 
      throw new Exception('Required variables are not yet set'); 
     } 
    }catch(Exception $e){ 
     echo $e->getMessage(); 
    } 
?>