假设我table在Rails应用程序中创建了一个表.一段时间后,我添加一个列运行:
rails generate migration AddUser_idColumnToTable user_id:string.
然后我意识到我需要添加user_id为索引.我知道这个add_index方法,但是这个方法应该在哪里调用？我应该运行迁移(如果是,哪一个？),然后手动添加此方法？
我需要一些帮助，如何使用 Perl 发送电子邮件。
当我尝试运行此代码时：
require_once ("Mail.php");
require_once ("Mail/mime.php");
$text = "test";
$html_message = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>....</title>
</head>
<body>
<p>...</p>
</body>
</html>';
$headers["From"] = 'sample@sampel.com';
$headers["To"] = "sample@sampel.com";
$headers["Subject"] = "Sample SMTP PERL";
$headers["Content-Type"] = 'text/html; charset=UTF-8';
$headers["Content-Transfer-Encoding"]= "8bit";
$mime = new Mail_mime;
$mime->setTXTBody($text);
$mime->setHTMLBody($html_message);
$mimeparams=array();
// It refused to change to UTF-8 even if the header was set to this, after adding the following lines it worked.
$mimeparams['text_encoding']="8bit"; …