trigger SendIndustryChangeEmail on Account (before update) {
for (Account a : Trigger.new) {
Account oldAccount = Trigger.oldMap.get(a.Id);
if (a.Industry != oldAccount.Industry) {
Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
email.setToAddresses(new String[] {a.Owner.Email});
email.setSubject('Industry Changed for Account: ' + a.Name);
email.setPlainTextBody('The industry of the account has changed from ' +
oldAccount.Industry +' to ' + a.Industry);
Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
}
}
}
trigger and a separate class:
Trigger:
trigger SendIndustryChangeEmail on Account (before update) {
IndustryChangeHandler handler = new IndustryChangeHandler();
handler.sendIndustryChangeEmail(Trigger.new, Trigger.oldMap);
}
Class:
public class IndustryChangeHandler {
public void sendIndustryChangeEmail(List newAccounts, Map oldAccountsMap) {
for (Account newAccount : newAccounts) {
Account oldAccount = oldAccountsMap.get(newAccount.Id);
if (newAccount.Industry != oldAccount.Industry) {
Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
email.setToAddresses(new String[] {newAccount.Owner.Email});
email.setSubject('Industry Changed for Account: ' + newAccount.Name);
email.setPlainTextBody('The industry of the account has changed from ' +
oldAccount.Industry +' to ' + newAccount.Industry);
Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
}
}
}
}