我有一个这样的表：
file_id : INT
file_name : VARCHAR[20]
file_data : BLOB
我将PDF文件存储在里面，我想发送一封带有数据库附件的电子邮件（使用PHP）。有什么想法或指导方针吗？
编辑：我不想下载它，然后附加它，然后删除临时文件。
试试这个
<?php
$path = "temp/";
$my_file="file.pdf";
$from_name = "hhhhh";
$from_mail = "abc@gmail.com";
$mailto = "abc@gmail.com";
$subject = "This is a mail with attachment.";
$message = "Hi,'r'n do you got attachment?'r'n'r'Hara";
$replyto="haraprasad@lemonpeak.com";
$file = $path.$my_file;
$file_size = filesize($file);
$handle = fopen($file, "r");
$content = fread($handle, $file_size);
fclose($handle);
$content = chunk_split(base64_encode($content));
$uid = md5(uniqid(time()));
$name = basename($file);
$header = "From: ".$from_name." <".$from_mail.">'r'n";
$header .= "Reply-To: ".$replyto."'r'n";
$header .= "MIME-Version: 1.0'r'n";
$header .= "Content-Type: multipart/mixed; boundary='"".$uid."'"'r'n'r'n";
$header .= "This is a multi-part message in MIME format.'r'n";
$header .= "--".$uid."'r'n";
$header .= "Content-type:text/plain; charset=iso-8859-1'r'n";
$header .= "Content-Transfer-Encoding: 7bit'r'n'r'n";
$header .= $message."'r'n'r'n";
$header .= "--".$uid."'r'n";
$header .= "Content-Type: application/octet-stream; name='"".$name."'"'r'n"; // use different content types here
$header .= "Content-Transfer-Encoding: base64'r'n";
$header .= "Content-Disposition: attachment; filename='"".$name."'"'r'n'r'n";
$header .= $content."'r'n'r'n";
$header .= "--".$uid."--";
mail($mailto, $subject, $message, $header)
?>