How to Automate Email Sending from MySQL 5.1 Using Triggers and UDFs?

How to Send Email from MySQL 5.1 Using Triggers and UDFs

Sending automatic emails based on database events can be achieved with MySQL 5.1. This article explores two approaches: a trigger-based solution and a user-defined function (UDF)-based solution.

1. Trigger-Based Solution

This approach involves creating a trigger that fires before an insert operation on a designated table. Here's an example trigger:

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 an email file based on the values inserted into the emaildrop table. You can customize the file based on your requirements.

2. UDF-Based Solution

To enhance the email body markup, a UDF can be used:

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 used to enhance the email body content for improved formatting.

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