global class BatchCaseRecord implements Database.Batchable<sObject> {
    global final string query;
    DateTime dt = DateTime.now();
    String monthName = dt.format('MMMMM');
    Integer year = Date.today().year();
    global Database.QueryLocator start(Database.BatchableContext bc) {
// what will be query to get the record which need to processed 
        string query = 'SELECT Account__c FROM CaseRecord_Account__c Limit 2000';

        return Database.getQueryLocator(query);
    }
    global void execute(Database.BatchableContext bc, List<CaseRecord_Account__c> CNbatch) {
        List<Case> caserecords = new List<Case>();
        String rtype = [select id from recordtype where sobjecttype = 'Case' and name = 'CaseRecord'].id;
        for (CaseRecord_Account__c CN : CNbatch) {
            for (integer i = 0; i < AccountList.size; i++) {
                //        
                //what will be if codition to check if case is not created this month 
                case c1 = new case();

                c1.Month__c = monthName.left(3);
                c1.Year__c = String.valueOf(year);
                c1.Reason__c = 'Phone';
                c1.RecordTypeId = rtype;
                c1.Client_Account__c = CN.Account__c;
                caserecords.add(c1);
                if (!caserecords.isEmpty()) {
                    database.insert(caserecords, false);
                }
            }
        }
    }
//}
/// send the email to account user for those case is created


    global void finish(Database.BatchableContext bc) {
        AsyncApexJob a = [Select Id, Status,ExtendedStatus,NumberOfErrors, JobItemsProcessed,TotalJobItems, CreatedBy.Email from AsyncApexJob where Id = :BC.getJobId()];
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[]{
                a.CreatedBy.Email
        };
        mail.setToAddresses(toAddresses);
        mail.setSubject('Match Merge Batch ' + a.Status);
        mail.setPlainTextBody('records processed ' + a.TotalJobItems + 'with ' + a.NumberOfErrors + ' failures.');
        Messaging.sendEmail(new Messaging.SingleEmailMessage[]{
                mail
        });
    }
}