Question

    <?php

try{
include_once "inc/db.inc.php" ;
include "inc/sessions.inc.php";
//    Inserting into Database :

    date_default_timezone_set('Asia/Amman');
    $Current_time = time();
    $DateTime = strftime("%d-%m-%Y/%H:%M",$Current_time);

    if($_SERVER['REQUEST_METHOD'] === 'POST'){
    if(isset($_POST['btn'])){
    if(!empty($_POST['name'])){
    $admin = "Anonymous" ; //Default Admin


    $Query = "INSERT INTO categories(datetime,creatorname,name)
                VALUES(?,?,?)";


    $Statement = $Connection->prepare($Query);
    $Statement-> bindValue(1,$DateTime);
    $Statement-> bindValue(2,$admin);
    $Statement-> bindValue(3,$_POST['name']);
    $Statement-> execute();




            $_SESSION['SuccessMessage'] = "Successfully Added One New Category !" ;


    } //if !empty(name)
        else {
            $_SESSION['ErrorMessage'] = "Please Fill The Feilds Correctly !" ;

        }
    } //if isset(btn)
                else {
            $_SESSION['ErrorMessage'] = "Sorry Something Went Wrong";
        }

    } 


    //Fetch out from the DB

      $Fetch = "SELECT * FROM categories" ;
      $Srno = 0;

        $Statement2 = $Connection->prepare($Fetch);
        $Statement2-> bindColumn('datetime',$DateTimeE);
        $Statement2-> bindColumn('creatorname',$adminE);


    //
    //
    //
    //
    //
    //
//    Getting Errors





    $errorInfo = $Connection-> errorInfo();

    if(isset($errorInfo[2])){
        $error = $errorInfo[2];
    }

}

catch (Exception $e) {
    $error = $e-> getmessage();

}
?>



<!DOCTYPE html>
<html>
    <head>
     <meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
       <meta name="description" content="Your Description">


    <link rel="stylesheet" href="css/bootstrap.min.css">
    <link rel="stylesheet" href="css/pub.css">
     <script src="js/jquery-3.3.1.min.js"></script>
      <script src="js/bootstrap.min.js"></script>



        <title>My Blog</title>



    </head>


             <body>


             <?php 
                 if(isset($error)) {
                     echo "<div class=\"alert alert-danger\">".
                     $error
                     ."</div>" ;
                 }
                 else {
                 ?>





       <div class="container-fluid">
       <div class="row">
       <div class="col-sm-2">
           <ul class="nav nav-pills nav-stacked" id="sideNav">
              <br>
               <li><a href="dashboard.php">Dashboard</a></li>
               <li><a href="users.php"> Users</a></li>
               <li><a href="compose.php">Compose</a></li>
               <li class="active"><a href="categories.php">Categories</a></li>
               <li><a href="comments.php">Comments</a></li>
               <li><a href="index.php">Live Blog</a></li>
               <li><a href="logout.php">Logout</a></li>
           </ul>


       </div> <!-- col-sm-2 -->






            <div class="col-sm-10">
                <h1>Categories :</h1>


                <form method="post" action="categories.php">
                   <div class="form-group">
                       <div> <?php echo Message() ; echo SuccessMessage() ;?> </div>
                    <label for="name">Create New Category :</label>
                    <input type="text" id="name" class="form-control" placeholder="Category name" name="name"> <br>
                      <input id="btn" type="submit" name="btn" value="submit" class="btn btn-success btn-block">
                       </div>
                </form>



            <hr>





<!--            Fetching Out Some Data From The Database/            -->


            <table class="table table-responsive table-stripped table-hover">


                <tr>
                    <th>Sr.no</th>
                    <th>Created at</th>
                    <th>Creator</th>
                    <th>Name</th>
                </tr>
         <?php $Statement2->fetch(PDO::FETCH_BOUND);?>
                <?php while($Statement2->fetch(PDO::FETCH_BOUND)){?>       
     <tr>
         <td><?php echo $DateTimeE;?></td>
         <td><?php echo $adminE;?></td>

     </tr>


                <?php }?>
            </table>




      </div> <!-- col-sm-10 -->

</div> <!-- row -->   
</div> <!-- Container-fluid -->
<?php }?>
    </body>
</html>

正如您在我的代码中看到的那样，我正在尝试从我的数据库中提取一些数据，但问题是。当我使用PDO的bindColumn()方法时。从数据库中找不到任何东西。抱歉我的英文

信息： - 我的数据库中有数据，它不是空的。

我应该做些什么，是我的代码中的问题如果陈述......等等或因为我错过了Code中的一些陈述，哦，实际上PDO很难理解我是从MySQL转换的PDO的语法

Answer 1

你对bindColumn的调用失败的原因是你没有执行第二个sql语句 - 即使你有两次调用fetch( PDO::FETCH_BOUND )所以你会丢失显示的第一条记录

下面有一些评论 - 我用我自己的pdo连接测试了这个，这帮我解决了错误。我建议的一件事是在throw处于各个关键点时使用try/catch方法，这样您就可以根据变量是否丢失或查询失败等产生有意义的错误。

<?php
    try{
        $error = false;

        include_once "inc/db.inc.php" ;
        include "inc/sessions.inc.php";


        /* These were not defined so threw errors when I ran the code */
        /*
        function Message(){
            echo 'Message() called<br />';
        }
        function SuccessMessage(){
            echo 'SuccessMessage() called<br />';
        }
        */

        date_default_timezone_set('Asia/Amman');
        $Current_time = time();
        $DateTime = strftime("%d-%m-%Y/%H:%M",$Current_time);



        if( $_SERVER['REQUEST_METHOD'] === 'POST'){
            if( isset( $_POST['btn'] ) ){
                if( !empty( $_POST['name'] ) ){
                    $admin = "Anonymous";

                    /* datetime is a special word in sql - use backticks */
                    $sql = "insert into `categories` ( `datetime`,`creatorname`,`name` ) values (?,?,?)";


                    $stmt = $Connection->prepare( $sql );
                    /* You need to check the status of any call to `prepare` and use it to fork the code */
                    if( !$stmt )throw new Exception( sprintf('failed to prepare sql query: %s', implode( ',', $Connection->errorInfo() ) ) );

                    $stmt-> bindValue(1, $DateTime );
                    $stmt-> bindValue(2, $admin );
                    $stmt-> bindValue(3, $_POST['name'] );
                    $stmt-> execute();

                    $_SESSION['SuccessMessage'] = "Successfully Added One New Category !" ;


                }  else {
                    $_SESSION['ErrorMessage'] = "Please Fill The Feilds Correctly !" ;

                }
            } else {
                $_SESSION['ErrorMessage'] = "Sorry Something Went Wrong";
            }
        }//close POST processing

        /* You only need two columns */
        $sql = "select `datetime`,`creatorname` from `categories`";
        $Srno = 0;

        $stmt = $Connection->prepare( $sql );
        $stmt-> bindColumn( 'datetime', $DateTimeE );
        $stmt-> bindColumn( 'creatorname', $adminE );

        /* The reason calls to `bindColumn` were not working was you failed to execute the query */
        $results=$stmt->execute();

        if( !$results ) throw new Exception( sprintf('Query failed: %s', implode( ',', $stmt->errorInfo() ) ) );

        $errorInfo = $Connection->errorInfo();
        if( isset( $errorInfo[2] ) ){
            $error = $errorInfo[2];
        }

    } catch ( Exception $e ) {
        $error = $e-> getmessage();
    }
?>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="description" content="Your Description">

        <link rel="stylesheet" href="css/bootstrap.min.css">
        <link rel="stylesheet" href="css/pub.css">
        <script src="js/jquery-3.3.1.min.js"></script>
        <script src="js/bootstrap.min.js"></script>

        <title>My Blog</title>
    </head>
    <body>
    <?php 
        if( !empty( $error ) ) {
            echo "<div class='alert alert-danger'>$error</div>" ;
        } else {
    ?>
        <div class="container-fluid">
            <div class="row">
                <div class="col-sm-2">
                   <ul class="nav nav-pills nav-stacked" id="sideNav">
                      <br>
                       <li><a href="dashboard.php">Dashboard</a></li>
                       <li><a href="users.php"> Users</a></li>
                       <li><a href="compose.php">Compose</a></li>
                       <li class="active"><a href="categories.php">Categories</a></li>
                       <li><a href="comments.php">Comments</a></li>
                       <li><a href="index.php">Live Blog</a></li>
                       <li><a href="logout.php">Logout</a></li>
                   </ul>
                </div><!-- col-sm-2 -->
                <div class="col-sm-10">
                    <h1>Categories :</h1>
                    <form method="post" action="categories.php">
                       <div class="form-group">
                           <div>
                           <?php
                                echo Message();
                                echo SuccessMessage();
                            ?>
                            </div>
                        <label for="name">Create New Category :</label>
                        <input type="text" id="name" class="form-control" placeholder="Category name" name="name"> <br>
                          <input id="btn" type="submit" name="btn" value="submit" class="btn btn-success btn-block">
                           </div>
                    </form>
                    <hr>


                    <table class="table table-responsive table-stripped table-hover">
                        <tr>
                            <th>Sr.no</th>
                            <th>Created at</th>
                            <th>Creator</th>
                            <th>Name</th>
                        </tr>
                        <?php 

                            /* only one Fetch command in the loop - otherwise you effectively lose the first record */
                            while( $stmt->fetch( PDO::FETCH_BOUND ) ){


                        ?>       
                        <tr>
                            <td><?php echo $DateTimeE;?></td>
                            <td><?php echo $adminE;?></td>
                        </tr>
                        <?php
                        }//close while loop
                        ?>
                    </table>
                </div> <!-- col-sm-10 -->
            </div> <!-- row -->   
        </div> <!-- Container-fluid -->
        <?php 
        }//close if/else
        ?>
    </body>
</html>

数据库内容

+------------------+-----------------+--------+
| datetime         | creatorname     | name   |
+------------------+-----------------+--------+
| 23/12/2018 10:50 | jimbob          | jimmy  |
| 24/12/2018 16:32 | Freda           | Freda  |
| 25/12/2018 15.25 | Geronimo        | Gogs   |
| 26/12/2018 14:41 | Susan Hampshire | Susan  |
| 27/12/2018       | Harriet         | Harpy  |
| 23/12/2018 10:50 | jimbobx         | jimmyx |
+------------------+-----------------+--------+

结果

获取绑定不起作用，Php + PDO

1 个答案: