Question

基本上我创建了一组简单的php文件：

允许用户登录。允许该用户上传文件。然后允许用户查看他们上传的所有文件。

奇怪的是，当我通过1个用户名上传文件时，文件列表结果显示相同的结果4次然后我上传了第二个文件，它出现了5次。对于另一个用户，它会显示5次。

我检查了上传后文件存储的位置，每个文件只有一个副本。以下是我的代码，任何帮助？

index.php - 这有登录表单，文件上传表格，最后是下载列表

        <?
    break;
    }
?>
<?php if ($_SESSION['username']): ?>
    <h1>Welcome, <?php echo $_SESSION["username"] ?></h1></br>
    <?php
//include ("config.php");
    //Connect to mysql server
    $link = mysql_connect($host, $dbuser, $dbpwd);
    if(!$link) {
        die('Failed to connect to server: ' . mysql_error());
    }

    //Select database
    $db = mysql_select_db($dbname);
    if(!$db) {
        die("Unable to select database");

        }

?>  
    Select File To Upload
<div style="width:100%; margin:5px;">
<form action="uploadclientfile.php" method="post" enctype="multipart/form-data" name="upload" style="margin:5px;">
<label> File</label>
<input name="uploaded_file" type="file" class="input-xlarge" required/>
<input type="hidden" name="" value="<?php $_SESSION['username'] ?>" />
<input type="hidden" name="MAX_FILE_SIZE" value="1000000" /><br /><br />
<input name="Upload" type="submit" value="Upload" class="btn" />
</form>
</div></br></br>

File list:</br>
<?php
$userfiles = mysql_query("SELECT filename, filelocation FROM cfiles WHERE userid='{$_SESSION['username']}'" );
while ($row = mysql_fetch_assoc($userfiles)) {
    $filename = $row['filename'];
    $filelocation = $row['filelocation'];   
echo "<a href=".$filelocation .">" .$filename . "</a><br />"; 
} ?>
<?php endif; ?>
<a href="index.php?action=login">Log-in</a> | <a href="index.php?action=logout">Log-out</a><br />
</body>
</html>

还有upload.php

 <?php 
 session_start(); 
 echo( "<pre>" );
 print_r( $_POST );
 print_r( $_FILES );
 echo( "</pre>" );



 $target = "userfiles/"; 
 $target = $target . basename( $_FILES['uploaded_file']['name']); 

  $new_file_name = str_replace(' ', '_', $target);

 //This gets all the other information from the form 
 $userid = $_SESSION['username'];  
 $file = basename( $_FILES['uploaded_file']['name'] );


// Cycle through each member and check that it needs to be added to the db
$useruploadids = mysql_query( "SELECT id FROM members" );
while ($row = mysql_fetch_assoc($useruploadids))
{
        //Writes the information to the database 
        mysql_query("INSERT INTO `cfiles` VALUES ('{$userid}', '{$file}', '{$new_file_name}')") or die( mysql_error() ) ; 
}

 //Writes the file to the server 
 if( @move_uploaded_file( $_FILES['uploaded_file']['tmp_name'], $new_file_name ) ) 
 { 
    //Tells you if its all ok 
    echo "The file ". basename( $_FILES['uploaded_file']['name'] ). " has been uploaded, and your information has been added to the directory."; 
 } 
 else
 { 
    //Gives and error if its not 
    echo "Sorry, there was a problem uploading your file."; 
 } 
 ?>

因此，此过程中使用了2个主要文件。有关为什么我的文件多次出现在下载列表和mysql数据库中的任何帮助？它仅在存储的文件夹中出现一次。

Answer 1

这部分代码：

// Cycle through each member and check that it needs to be added to the db
$useruploadids = mysql_query( "SELECT id FROM members" );
while ($row = mysql_fetch_assoc($useruploadids))
{
    //Writes the information to the database 
    mysql_query("INSERT INTO `cfiles` VALUES ('{$userid}', '{$file}', '{$new_file_name}')") or die( mysql_error() ) ; 
}

循环浏览您拥有的用户数量，并为每个用户添加新的文件条目。因此，如果您有5个用户，则在cfiles中为已登录的人员$userid添加5个条目。这将随着更多用户而增加。

这是你的意思吗？您可能只想为该用户添加一个条目，而不是其他用户，对吗？

如果删除循环并用以下代码替换该代码：

mysql_query("INSERT INTO `cfiles` VALUES ('{$userid}', '{$file}', '{$new_file_name}')") or die( mysql_error() ) ;

您只能获得一个条目

Answer 2

这段代码让我困惑：

// Cycle through each member and check that it needs to be added to the db
$useruploadids = mysql_query( "SELECT id FROM members" );
while ($row = mysql_fetch_assoc($useruploadids))
{
        //Writes the information to the database 
        mysql_query("INSERT INTO `cfiles` VALUES ('{$userid}', '{$file}', '{$new_file_name}')") or die( mysql_error() ) ; 
}

你想在这做什么？您似乎正在多次将上载的文件插入数据库，每个用户都存在一次。你为什么这样做？这就是文件出现多次的原因吗？（似乎对我而言）

为什么这会多次向数据库添加数据？

2 个答案: