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php实现上传图片保存到数据库的方法,
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php实现上传图片保存到数据库的方法,

Jun 13, 2016 am 09:14 AM
php picture database method

php实现上传图片保存到数据库的方法,

php实现上传图片保存到数据库的方法。分享给大家供大家参考。具体分析如下:

php 上传图片,一般都使用move_uploaded_file方法保存在服务器上。但如果一个网站有多台服务器,就需要把图片发布到所有的服务器上才能正常使用(使用图片服务器的除外)
如果把图片数据保存到数据库中,多台服务器间可以实现文件共享,节省空间。

首先图片文件是二进制数据,所以需要把二进制数据保存在mysql数据库。
mysql数据库提供了BLOB类型用于存储大量数据,BLOB是一个二进制对象,能容纳不同大小的数据。

BLOB类型有以下四种,除存储的最大信息量不同外,其他都是一样的。可根据需要使用不同的类型。

TinyBlob       最大 255B
Blob              最大 65K
MediumBlob  最大 16M
LongBlob      最大 4G

数据表photo,用于保存图片数据,结构如下:

复制代码 代码如下:

CREATE TABLE `photo` ( 
  `id` int(10) unsigned NOT NULL auto_increment, 
  `type` varchar(100) NOT NULL, 
  `binarydata` mediumblob NOT NULL, 
  PRIMARY KEY  (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

upload_image_todb.php:

复制代码 代码如下:

// 连接数据库 
$conn=@mysql_connect("localhost","root","")  or die(mysql_error()); 
@mysql_select_db('demo',$conn) or die(mysql_error()); 

// 判断action 
$action = isset($_REQUEST['action'])? $_REQUEST['action'] : ''; 

// 上传图片 
if($action=='add'){ 
    $image = mysql_escape_string(file_get_contents($_FILES['photo']['tmp_name'])); 
    $type = $_FILES['photo']['type']; 
    $sqlstr = "insert into photo(type,binarydata) values('".$type."','".$image."')"; 
    @mysql_query($sqlstr) or die(mysql_error()); 
    header('location:upload_image_todb.php'); 
    exit(); 
// 显示图片 
}elseif($action=='show'){ 
    $id = isset($_GET['id'])? intval($_GET['id']) : 0; 
    $sqlstr = "select * from photo where id=$id"; 
    $query = mysql_query($sqlstr) or die(mysql_error()); 
    $thread = mysql_fetch_assoc($query); 
    if($thread){ 
        header('content-type:'.$thread['type']); 
        echo $thread['binarydata']; 
        exit(); 
    } 
}else{ 
// 显示图片列表及上传表单 
?> 
 
 
 

 
   
  upload image to db demo  
  
 
  
 
 
 

图片:

 
 

 
 
 
 
    $sqlstr = "select * from photo order by id desc"; 
    $query = mysql_query($sqlstr) or die(mysql_error()); 
    $result = array(); 
    while($thread=mysql_fetch_assoc($query)){ 
        $result[] = $thread; 
    } 
    foreach($result as $val){ 
        echo '

php实现上传图片保存到数据库的方法,

'; 
    } 
?> 
 
 

?>

希望本文所述对大家的php程序设计有所帮助。

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