global void finish(Database.BatchableContext BC){
AsyncApexJob a = [SELECT Id, Status, NumberOfErrors, JobItemsProcessed,
TotalJobItems, CreatedBy.Email
FROM AsyncApexJob WHERE Id =
:BC.getJobId()];
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
mail.setToAddresses(new String[]{'testmail@salesforce.com'});
mail.setReplyTo('noreply@salesforce.com');
mail.setSenderDisplayName('Batchプロセス');
mail.setSubject('Batch完了');
mail.setPlainTextBody('Batch完了しました。エラー' + a.NumberOfErrors +'件');
Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
}