global class AccountOwnerReassignment implements
Database.Batchable<SObject>, Database.Stateful{
User fromUser{get; set;}
User toUser{get; set;}
Double failedUpdates{get; set;}
//Parameter Construcotr
global AccountOwnerReassignment(User fromUser, User toUser){
this.fromUser = fromUser;
this.toUser = toUser;
failedUpdates = 0;
}
global Database.queryLocator
start(Database.BatchableContext ctx){
return Database.getQueryLocator([SELECT id, name, ownerId
FROM Account WHERE ownerId = :fromUser.id]);
}
global void execute(Database.BatchableContext ctx, List<Sobject> scope){
List<Account> accs = (List<Account>)scope;
for(Integer i = 0; i < accs.size(); i++){
accs[i].ownerId = toUser.id;
}
List<Database.SaveResult> dsrs = Database.update(accs, false);
for(Database.SaveResult dsr : dsrs){
if(!dsr.isSuccess()){
failedUpdates++;
}
}
}
global void finish(Database.BatchableContext ctx){
AsyncApexJob a = [SELECT id, ApexClassId,
JobItemsProcessed, TotalJobItems,
NumberOfErrors, CreatedBy.Email
FROM AsyncApexJob
WHERE id = :ctx.getJobId()];
String emailMessage = 'Your batch job '
+ 'AccountOwnerReassignment '
+ 'has finished. It executed '
+ a.totalJobItems
+ ' batches. Of which, ' + a.jobitemsprocessed
+ ' processed without any exceptions thrown and '
+ a.numberOfErrors +
' batches threw unhandled exceptions.'
+ ' Of the batches that executed without error, '
+ failedUpdates
+ ' records were not updated successfully.';
Messaging.SingleEmailMessage mail =
new Messaging.SingleEmailMessage();
String[] toAddresses = new String[] {a.createdBy.email};
mail.setToAddresses(toAddresses);
mail.setReplyTo('noreply@salesforce.com');
mail.setSenderDisplayName('Batch Job Summary');
mail.setSubject('Batch job completed');
mail.setPlainTextBody(emailMessage);
mail.setHtmlBody(emailMessage);
Messaging.sendEmail(new Messaging.SingleEmailMessage[]
{ mail });
}
}
In Developer Console Paste below code:
User fromUser = [select id,firstname from user where firstname = 'name of the user'];
User toUser = [select id,firstname from user where firstname = 'name of the user'];
Database.executeBatch(new AccountOwnerReassignment(fromUser,toUser));
Note: Name of the user means, Goto Managed Users>Click on particuar user> At the top below the User one name will display that name we should give in place of 'name of the user'
Calling Batch Apex from Trigger:
* Goto App Setup> Customize> Account> Triggers
Trigger AccountOwnerReassignment on Account (before insert) {
List<Account> al = Trigger.new;
for(Account a:al) {
User fromUser = [select id,firstname from user where alias = 'alias name'];
User toUser = [select id,firstname from user where alias = 'alias name'];
try {
Database.executeBatch(new AccountOwnerReassignment(fromUser,toUser));
}
Catch(Exception E) {
}
}
}
Note: In case, no rows queried from the SOQL Queries below error will arise.
Error: Invalid Data. Review all error messages below to correct your data.Apex trigger AccountOwnerReassignment caused an unexpected exception, contact your administrator: AccountOwnerReassignment: execution of BeforeInsert caused by: System.QueryException: List has no rows for assignment to SObject: Trigger.AccountOwnerReassignment: line 4, column 1
Refer:
http://developer.force.com/cookbook/recipe/using-batch-apex-to-reassign-account-owners
