global  class DF_BatchToExcessFields implements Database.Batchable<sObject>{
	 public list<String> query = new list<String>();
	 string str;
	 global DF_BatchToExcessFields(list<String> lstObjectAsString)
     {
        query.addAll(lstObjectAsString);
    }

	global Database.querylocator start(Database.BatchableContext info){ 
		str='select id from account';
        return  Database.getQueryLocator(str);
    }     
    global void execute(Database.BatchableContext info, List<account> scope){
    	//scope = new List<String>();
    	
       system.debug('+++++++++++query+++++'+query);
    }     
    global void finish(Database.BatchableContext info){     
    } 
}