Savepoint setSavepoint():

Returns a savepoint variable that can be stored as a local variable which we can use with a rollback method to restore the database to that point.

Void rollback(Savepoint sp):

Restores the database to the state specified by the savepoint argument. Any emails submitted since the last savepoint are also rollbacked and not sent.

Savepoint sp1 = new Database.setSavepoint();

List<Account> accList = [SELECT name, phone FROM account WHERE name like ‘Acc%’];

integer i = 1;

for(Account a: accList)

{

A.phone = i+’ ’;

i+=111;

}

update accList;

Savepoint sp2 = Database.setSavepoint();

for(Account b: accList)

{

b.name=b.name + ’ss’;

}

Update accList;

Savepoint sp3 = Database.setSavepoint();

if(roll=1)

Database.rollback(sp1);

else if(roll=2)

Database.rollback(sp2);

else if(roll=3)

Database.rollback(sp3);