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BatchUpdateContactMailingCity class to update the contact records
global with sharing class BatchUpdateContactMailingCity implements Database.Batchable<SObject>{
global Database.QueryLocator start(Database.BatchableContext bc){
String query = 'Select Id, BillingCity,(Select Id,Name, MailingCity from contacts) from Account';
return Database.getQueryLocator(query);
global void execute(Database.BatchableContext bc, List<Account> accList){
//list of contacts to update
List<Contact> conListToUpdate = new List<Contact>();
for(Account acc: accList){
for(Contact con: acc.contacts){
con.MailingCity = acc.BillingCity;
List<Database.SaveResult> updateResults = Database.update(conListToUpdate,false);
List<SObject> objList = new List<SObject>();
//call generic method to create the error log records
Util.createError(updateResults,objList,'Contact Update');
global void finish(Database.BatchableContext bc){
//add the finish code here
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