Apex trigger with best practices

Question

Accepted Answer

Best practices for writing Apex triggers

Use trigger handler pattern to separate logic from trigger
Avoid SOQL queries and DML statements inside loops
Bulkify triggers to handle multiple records efficiently
Use trigger context variables to access old and new record data
Write test classes to achieve code coverage

Accepted Answer

trigger opp on opportunity(after update){
if(trigger.isAfter){
    if(trigger.isUpdate){
	accountHandler AH = new accountHandler();
	AH.updateOpportunity(trigger.newMap);
      }
  }
}

public class accountHandler{

	public void updateOpportunity(Map acc){
		for(opportunity o:select id, email from opportunity where accountid =: acc.keyset()){
			o.email = acc.get(o.accountid);
		}
		update opp;
	}
}

Bulkify Your Code.
Avoid DML/SOQL Queries in Loops.
Avoid Hard-coded IDs.
Explicitly Declare Sharing Model.
Use a Single Trigger per SObject Type.
Use SOQL for Loops.
Modularize Your Code.
Test Multiple Scenarios.

Apex trigger with best practices

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