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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 09:15 AM
php upload keep picture accomplish database article method of

php实现上传图片保存到数据库的方法

 这篇文章主要介绍了php实现上传图片保存到数据库的方法,可通过将图片保存在数据库实现多台服务器共享文件的功能,非常具有实用价值,需要的朋友可以参考下

 

 

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:

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:

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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