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{"id":135,"date":"2017-03-04T23:26:54","date_gmt":"2017-03-04T23:26:54","guid":{"rendered":"http:\/\/ccloudonline.nl\/a-homepage-section\/?p=135"},"modified":"2017-04-29T13:45:39","modified_gmt":"2017-04-29T13:45:39","slug":"triggers","status":"publish","type":"post","link":"http:\/\/ccloudonline.nl\/?p=135","title":{"rendered":"Triggers"},"content":{"rendered":"As you probably know, triggers are one of the two Apex types we have to our disposal when developing with Apex. The most relevant difference between an Apex class and a trigger is the particular occasions in which triggers are used. They are related to DML, (Data Manipulation Language<\/em>) operations. To keep it simple, when and execution operation fires actions like insert, update, delete, and undelete. These operations can be executed in a kind of “time frame”…nothing fancy, we can set the ‘before’ and ‘after’ attributes to our trigger to implicitly tell our trigger when to fire.<\/p>\n An important factor when writing triggers is the fact that they run on system content<\/strong>, meaning this that there is not user reinforcement on access level or access visibility to any of the components you are going to be in used by your trigger.<\/p>\n [code lang=”php”]<\/p>\n \/\/These are the basic first lines on a trigger.<\/p>\n trigger theContactTrigger on Contact (before insert, before update, after insert, after update, after undelete) [\/code]<\/p>\n These are all the operation types: <\/p>\n A trigger is Apex code that executes before or after the following types of operations:<\/p>\n <\/b><\/p>\n You should be checking APEX Salesforce documentation to get all details about triggers. I want to talk more about the impact that triggers have on an organization and the discussion of using or not a trigger handlers as a possible solution. <\/p>\n How to start thinking about what should be a good approach? , Some basic ideas.<\/p>\n 1. One trigger per object mechanism.<\/strong> So let’s take a look at one simple piece of code:<\/p>\n [code lang=”php”]<\/p>\n \/\/These are the basic first lines on a trigger.<\/p>\n trigger theContactTrigger on Contact (before insert, before update, after insert, after update, after undelete) [\/code]<\/p>\n What we have done is to pass all responsibilities to another class. We invoked the method ‘contactStatusMethod()’<\/strong> from the class ‘ChangeContactStatus’<\/strong> to run our logic. <\/p>\n This is the simple operation that will update the custom status field to active if no values are there: <\/p>\n [code lang=”php”]<\/p>\n public with sharing class SetContactStatus {<\/p>\n \tpublic static void contactStatusMethod() \t}
\n {
\n \/\/Your code here
\n }<\/p>\n
\n Triggers should contain as less code as possible in their body.
\n Trying to avoid this will already be a solid base for your trigger structure.
\n <\/br>
\n 2. Remember that triggers do not reinforce system restrictions or access levels to records.<\/strong>
\n This is again a reason why you should move your code out of the trigger body.
\n <\/br>
\n 3. Try to delegate the triggers DML operations to other classes.<\/strong>
\n This is really important and the foundations of a good trigger structure, well known as best practice. <\/p>\n
\n {
\n \/\/This first line will make sure that we invoke our class only in ‘before update’ operations.
\n if(Trigger.isBefore && Trigger.isUpdate)
\n SetContactStatus.contactStatusMethod();
\n }<\/p>\n
\n\t{
\n\t\tfor(Contact c: (List<Contact>) trigger.new)
\n\t\t{
\n\t\t\tif(c.Status__c == null)
\n\t\t\t\tc.Status__c =’Active’;
\n\t\t}<\/p>\n
\n}
\n[\/code]<\/p>\n