AmbreJuryeaAmole

// New account
Account a = new Account(Name = 'New Account');
insert a;
// If DML failed, salesforce shows error and rolls-back the new record

// New Case linked to account
Case c = new Case(subject = 'I need help', accountId = a.id);
insert c;
// If DML failed, salesforce shows error and rolls-back the new record

AmbreJuryeaAmole

// New account
Account a = new Account(Name = 'New Account');
try{

    insert a;
    system.debug('Success');

} catch(dmlexception e){

  // If DML failed, ends up here

AmbreJuryeaAmole

// Record the place "in time" where we would ultimately like to return the state of the database to upon an error.
Savepoint sp = Database.setSavepoint(); // <<<<<<<<<<<<

// New account
Account a = new Account(Name = 'New Account');
try{

    insert a;
    system.debug('Success');

AmbreJuryeaAmole

trigger CaseTrigger on Case (after insert) {
 
 system.debug('***CaseTrigger begin');

 // In this example trigger we are simply wanting to flag at the Account level
 // that the Account has a Case linked to it, which is a lookup field on Case
 // so we wouldn't be able to do a rollup count.
 // In reality we would also want to track deletes of Cases but that is skipped 
 // for demonstration purposes.
  

AmbreJuryeaAmole

trigger CaseTrigger on Case (after insert) {
 
 system.debug('***CaseTrigger begin');

 // In this example trigger we are simply wanting to flag at the Account level
 // that the Account has a Case linked to it, which is a lookup field on Case
 // so we wouldn't be able to do a rollup count.
 // In reality we would also want to track deletes of Cases but that is skipped 
 // for demonstration purposes.
  

AmbreJuryeaAmole

trigger CaseTrigger on Case (after insert) {
 
 system.debug('***CaseTrigger begin');

 // In this example trigger we are simply wanting to flag at the Account level
 // that the Account has a Case linked to it, which is a lookup field on Case
 // so we wouldn't be able to do a rollup count.
 // In reality we would also want to track deletes of Cases but that is skipped 
 // for demonstration purposes.