Apex Code to send Email Alert

apex-code, salesforce

Solution

Please refer http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_classes_email_outbound.htm to learn more about sending outbound emails.

Here's a sample code that sends email to previous owner when the owner is changed:

trigger SendEmailOnOwnerChange on Account (after update) {
    if (trigger.old[0].OwnerId != trigger.new[0].OwnerId) {
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

        String emailAddr = [select Email from User where Id = :trigger.old[0].OwnerId].Email;
        String newOwnerName = [select Name from User where Id = :trigger.new[0].OwnerId].Name;

        String[] toAddresses = new String[] {emailAddr};
        mail.setToAddresses(toAddresses);

        mail.setSubject('Owner Changed for Account : ' + trigger.new[0].Name);

        mail.setPlainTextBody('Owner of Account: ' + trigger.new[0].Name + ' Changed to ' + newOwnerName);
        mail.setHtmlBody('Owner of Account: <b>' + trigger.new[0].Name + '</b> Changed to <b>' + newOwnerName  + '</b>');

        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }
}

Of course it currently works for only one record and needs to be bulkified for bulk update.

Problem

Original source