Question

我有一些代码，允许用户以某种数据类型下载数据库中的文件，下载php代码将允许用户下载文件。

在我的sql部分中，我将mime数据类型设置为varchar（20），size设置为bigint（20），数据设置为longblob。但是，当我单击下载按钮时，它表示文件已损坏但手动检查数据库中的详细信息时，会存储详细信息。

enter image description here

那么您认为数据类型有错误还是我必须更改download.php或upload.php？

Download.php看起来像这样：

if(isset($_GET['id'])) {
// Get the ID
$id = ($_GET['id']);

// Make sure the ID is in fact a valid ID
if($id <= 0) {
    die('The ID is invalid!');
}
else {
    // Connect to the database
    $dbLink = new mysqli('server', 'databaseuser', 'password', 'databasename');
    if(mysqli_connect_errno()) {
        die("MySQL connection failed: ". mysqli_connect_error());
    }

    // Fetch the file information
    $query = "
        SELECT `mime`, `name`, `size`, `data`
        FROM `files`
        WHERE `id` = {$id}";
    $result = $dbLink->query($query);

    if($result) {
        // Make sure the result is valid
        if($result->num_rows == 1) {
        // Get the row
            $row = mysqli_fetch_assoc($result);

            // Print headers
            header("Content-Type: ". $row['mime']);
            header("Content-Length: ". $row['size']);
            header("Content-Disposition: attachment; filename=". $row['name']);

            // Print data
            echo $row['data'];
        }
        else {
            echo 'Error! No files exists with that ID.';
        }


    }
    else {
        echo "Error! Query failed: <pre>{$dbLink->error}</pre>";
    }
    @mysqli_close($dbLink);
}
}
  else {
   echo 'Error! No ID was passed.';
  }
 ?>

Upload.php如下所示：

 <?php
 // Check if a file has been uploaded
  if(isset($_FILES['uploaded_file'])) {
// Make sure the file was sent without errors
if($_FILES['uploaded_file']['error'] == 0) {
    // Connect to the database
    $dbLink = new mysqli('server', 'databaseuser', 'password', 'databasename');
    if(mysqli_connect_errno()) {
        die("MySQL connection failed: ". mysqli_connect_error());
    }

    // Gather all required data
    $name = $dbLink->real_escape_string($_FILES['uploaded_file']['name']);
    $mime = $dbLink->real_escape_string($_FILES['uploaded_file']['type']);
    $data = $dbLink->real_escape_string(file_get_contents($_FILES  ['uploaded_file']      ['tmp_name']));
    $size = intval($_FILES['uploaded_file']['size']);

    // Create the SQL query
    $query = "
        INSERT INTO `files` (
            `name`, `mime`, `size`, `data`, `created`
        )
        VALUES (
            '{$name}', '{$mime}', {$size}, '{$data}', NOW()
        )";

    // Execute the query
    $result = $dbLink->query($query);

    // Check if it was successfull
    if($result) {
        echo 'Success! Your file was successfully added!';
    }
    else {
        echo 'Error! Failed to insert the file'
           . "<pre>{$dbLink->error}</pre>";
    }
}
else {
    echo 'An error accured while the file was being uploaded. '
       . 'Error code: '. intval($_FILES['uploaded_file']['error']);
}

// Close the mysql connection
$dbLink->close();
 }
  else {
echo 'Error! A file was not sent!';
  }

   // Echo a link back to the main page
   echo '<p>Click <a href="index.html">here</a> to go back</p>';
   ?>

Answer 1

作为一般规则，文件应存储在文件系统或共享存储系统（如S3或NFS）中，文件路径/ URL存储为字符串。存储实际文件会带来各种各样的问题 - 更多关于数据库的工作比必要的更多，备份时的不愉快等等。

使用php的mysql数据库中的大文件的数据类型是什么？

1 个答案: