2006 - MySQL服务器已经消失

Question

我正在尝试使用php从我的mysql数据库中显示图像。图像未完全显示。它在试图显示超过200 kb的图像时被切断（根据试验确定，但不太确定）。

HTML代码：

<form enctype="multipart/form-data" action="insertimage.php" method="post" name="changer">
<input name="MAX_FILE_SIZE" value="10240000" type="hidden">
<input name="image" accept="image/jpeg|image/jpg|image|JPG|image/png|image/gif" type="file">
<input value="Submit" type="submit">

PHP代码：

<?php
    require('myconnect.php');

    if (isset($_FILES['image']) && $_FILES['image']['size'] > 0) { 

              // Temporary file name stored on the server
              $tmpName  = $_FILES['image']['tmp_name'];  

              // Read the file 
              $fp     = fopen($tmpName, 'r');
              $data = fread($fp, filesize($tmpName));
              $data = addslashes($data);
              fclose($fp);


              // Create the query and insert
              // into our database.
              $query = "Update whyangry.posts set Photo='$data' where Pid=2";
              $results = mysql_query($query, $con);

              // Print results
              print "Thank you, your file has been uploaded.";

    $sql = "SELECT * FROM helpme.posts WHERE Pid=2";
    $res = mysql_query($sql,$con);
    while ($res1=mysql_fetch_assoc($res))
    {   
    $content = $res1['Photo'];
    $id=$res1['Pid'];

    }
    echo '<img src="data:image/png|image/jpeg|image/gif;base64,' . base64_encode( $content ) . '" />';
    echo 'Hello world.';

    }
    else {
       print "No image selected/uploaded";
    }

    ?>

在将phpmyadmin中的文件上传到blob数据类型

时，我也遇到以下错误

UPDATE `helpme`.`posts` SET `Photo` = 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[...]

MySQL说：

2006 - MySQL服务器已经消失

请告诉我如何解决问题。问题出在显示图像时。是否有一些尺寸问题，我不知道请帮助。

Answer 1

使用addslashes远不是正确的SQL查询方式。它不会始终与二进制数据一起正常工作。我不知道你正在使用什么资源，但它教你很不好的习惯。

请勿在新应用中使用 mysql_query。这是一个20世纪90年代的遗留接口，由于不正确地使用它所涉及的危险而正在退役，这很容易做到。最好在新项目中使用mysqli或PDO。

您的查询应如下所示：

Update whyangry.posts set Photo=? where Pid=?

您可以在执行查询时绑定到这些占位符，并避免出现编码问题。如何正确执行此操作有many examples。

使用blob数据类型从mysql php显示图像时出错

2006 - MySQL服务器已经消失

1 个答案: