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keshava65keshava65 

Delete records in Batch class

Hi all,

Delete records batch apex account ,contacts ,opportunity and cases in single batchclass
Amit Chaudhary 8Amit Chaudhary 8
I hope you are try to learn Batch job in salesforce so i will recommend you to check trailhead below module that will help you in learning with real time example
1) https://developer.salesforce.com/trailhead/module/asynchronous_apex

Also please check below post. i hope that will help you
1) http://amitsalesforce.blogspot.in/2016/02/batch-apex-in-salesforce-test-class-for.html


Batch Apex
A Batch class allows you to define a single job that can be broken up into manageable chunks that will be processed separately.

When to use Batch Apex
One example is if you need to make a field update to every Account in your organization. If you have 10,001 Account records in your org, this is impossible without some way of breaking it up. So in the start() method, you define the query you're going to use in this batch context: 'select Id from Account'. Then the execute() method runs, but only receives a relatively short list of records (default 200). Within the execute(), everything runs in its own transactional context, which means almost all of the governor limits only apply to that block. Thus each time execute() is run, you are allowed 150 queries and 50,000 DML rows and so on. When that execute() is complete, a new one is instantiated with the next group of 200 Accounts, with a brand new set of governor limits. Finally the finish() method wraps up any loose ends as necessary, like sending a status email.

Sample Batch Apex
1) Start method is automatically called at the beginning of the apex job. This method will collect record or objects on which the operation should be performed. These record are divided into subtasks & passes those to execute method.

2) Execute Method performs operation which we want to perform on the records fetched from start method.

3) Finish method executes after all batches are processed. Use this method to send confirmation email notifications.
Let us know if this will help you

Thanks
Amit Chaudhary
JyothsnaJyothsna (Salesforce Developers) 
Hi ,

Please check the below code for delete Accounts, Contacts and Opportunities records using single batch class.
  
Global class BatchMassDeleteRecs Implements Database.batchable<sobject>{
     global final string query;
     global BatchMassDeleteRecs(string q){
         
          query=q;
     }
   
     global Database.QueryLocator start(Database.BatchableContext BC){

      return Database.getQueryLocator(query);
     }
     global  void execute(Database.BatchableContext BC,List<SObject> scope){
         delete scope;
    
    }
    global void finish(Database.BatchableContext BC){
    }

 }

Execute the below code in anonymous block
  
string str='select id,name,(select id,name from contacts), (select id, name from opportunities) from Account limit 1';
BatchMassDeleteRecs bdt=new BatchMassDeleteRecs(str);
Database.executeBatch(bdt);
system.debug(bdt);


Please check the below links for learning Batch Apex.

https://developer.salesforce.com/trailhead/module/asynchronous_apex


https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_batch_interface.htm

Hope this helps you!
Best Regards,
Jyothsna

 
srikanth cheera 6srikanth cheera 6
will you please write test class for this
Amit Chaudhary 8Amit Chaudhary 8
I will recommend you to start using trailhead to learn about test classes
1) https://trailhead.salesforce.com/modules/apex_testing

Also please check below post
1) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_qs_test.htm
2) https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_example.htm
3) http://amitsalesforce.blogspot.com/2015/06/best-practice-for-test-classes-sample.html

Test Class for Batch job
1) http://amitsalesforce.blogspot.com/search/label/Batch%20Job

Sample test class to start 
@isTest 
public class BatchMassDeleteRecsTest
{
    static testMethod void testMethod1()
    {
        
		Account acc = new Account();
        acc.name='test';
        insert acc;
        
        Test.startTest();

            BatchMassDeleteRecs obj = new BatchMassDeleteRecs();
            DataBase.executeBatch(obj); 
            
        Test.stopTest();
    }
}

Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
Single Action -To verify that the the single record produces the correct an expected result .
Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
Negative Testcase :-Not to add future date , Not to specify negative amount.
Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI,Force.com IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Let us know if this will help you

 
Vipul-GoyalVipul-Goyal
Hi,
you can directly use the functionalities provided in https://github.com/vipul-goyal/Salesforce-Batch-To-Delete-Records library. It can be used to delete record on any object as per your convenience.