How to Send Email Notifications from MySQL 5.1 Using Triggers and User-Defined Functions?

How to Send Email Notifications from MySQL 5.1

In this guide, we will explore how to send email notifications from MySQL 5.1 upon the insertion of new rows into a table. The recipient list will be dynamically generated based on a select statement.

Using SMTP Service

If you have an active SMTP service, you can use the "outfile" command to send emails. It involves creating a file in the SMTP drop directory, which is then processed by the SMTP service. However, this method may result in duplicate filenames with high volume, but techniques exist to mitigate this issue.

Creating a User-Defined Function (UDF)

Alternatively, you can create a UDF (User-Defined Function) to handle email sending. Here's a simple trigger solution that demonstrates this approach:

CREATE TRIGGER test.autosendfromdrop BEFORE INSERT ON test.emaildrop
FOR EACH ROW BEGIN
      /* START THE WRITING OF THE EMAIL FILE HERE*/      
      SELECT  concat("To: ",NEW.To),
              concat("From: ",NEW.From),
              concat("Subject: ",NEW.Subject),
              NEW.Body
          INTO OUTFILE 
                   "C:\inetpub\mailroot\pickup\mail.txt" 
              FIELDS TERMINATED by '\r\n' ESCAPED BY '';            
END;

This trigger creates a temporary file containing the email message, which is then picked up by the SMTP service.

Mark Up Email Body

To format the email body in HTML, you can use a function like the following:

CREATE FUNCTION `HTMLBody`(Msg varchar(8192)) 
    RETURNS varchar(17408) CHARSET latin1 DETERMINISTIC
BEGIN
  declare tmpMsg varchar(17408);
  set tmpMsg = cast(concat(
      'Date: ',date_format(NOW(),'%e %b %Y %H:%i:%S -0600'),'\r\n',
      'MIME-Version: 1.0','\r\n',
      'Content-Type: multipart/alternative;','\r\n',
      ' boundary=\"----=_NextPart_000_0000_01CA4B3F.8C263EE0\"','\r\n',
      'Content-Class: urn:content-classes:message','\r\n',
      'Importance: normal','\r\n',
      'Priority: normal','\r\n','','\r\n','','\r\n',
      'This is a multi-part message in MIME format.','\r\n','','\r\n',
      '------=_NextPart_000_0000_01CA4B3F.8C263EE0','\r\n',
      'Content-Type: text/plain;','\r\n',
      '  charset=\"iso-8859-1\"','\r\n',
      'Content-Transfer-Encoding: 7bit','\r\n','','\r\n','','\r\n',
      Msg,
      '\r\n','','\r\n','','\r\n',
      '------=_NextPart_000_0000_01CA4B3F.8C263EE0','\r\n',
      'Content-Type: text/html','\r\n',
      'Content-Transfer-Encoding: 7bit','\r\n','','\r\n',
      Msg,
      '\r\n','------=_NextPart_000_0000_01CA4B3F.8C263EE0--'
      ) as char);
  RETURN tmpMsg;
END ;

This function can be called to format the email body with appropriate HTML tags.

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