首先创建数据表，例如:

create table testblob (
    image_id        tinyint(3)  not null default '0',
    image_type      varchar(25) not null default '',
    image           blob        not null,
    image_size      varchar(25) not null default '',
    image_ctgy      varchar(25) not null default '',
    image_name      varchar(50) not null default ''
);

然后可以这样把图片插入数据库:

$imgData = file_get_contents($filename);
$size = getimagesize($filename);
mysql_connect("localhost", "$username", "$password");
mysql_select_db ("$dbname");
$sql = "INSERT INTO testblob
    ( image_id , image_type ,image, image_size, image_name)
    VALUES
    ('', '{$size['mime']}', '{$imgData}', '{$size[3]}', 
     '{$_FILES['userfile']['name']}')";
mysql_query($sql);

显示:

$link = mysql_connect("localhost", "username", "password");
mysql_select_db("testblob");
$sql = "SELECT image FROM testblob WHERE image_id=0";
$result = mysql_query("$sql");
header("Content-type: image/jpeg");
echo mysql_result($result, 0);
mysql_close($link);