[SalesForce] Class Must Implement the Global interface method: Iterable start Database

Given the following code:

global class MyBatch implements Database.Batchable<SObject> {

    global MyBatch() {}

    global void execute(Database.BatchableContext BC, List<MyBatch Field__c> batch)
    {

    }

    global void finish(Database.BatchableContext BC) {}
}

What does this error Message mean?

MyBatch: Class must implement the global interface method:
Iterable<SObject> start(Database.BatchableContext) from
Database.Batchable<SObject>

Best Answer

It means that you're missing a particular method; the interface is trying to enforce the implementation of this class.

So adding this method to the MyBatch class will resolve the issue:

    global Database.Querylocator start (Database.BatchableContext BC)
{
       return Database.getQueryLocator(query);
}

Related Solutions

[SalesForce] Iterator and Iterable issue – must implement the method: System.Iterable Database.Batchable.start(Database.BatchableContext)

Note that List<String> implements Iterable<String> so you don't have to write a class for that.

Something like this is closer to what you are looking for:

public class CustomBatch implements Database.Batchable<String> {

   private List<String> jsonStrings;

   public CustomBatch(List<String> jsonStrings) {
       this.jsonStrings = jsonStrings;
   }

   public List<String> start(Database.BatchableContext info) { 
       return jsonStrings; 
   }

   public void execute(Database.BatchableContext info, List<String> scope) { 
       Integer i = 0;
       for(String a : scope){ 
           System.debug(loggingLevel.Error, '*** json_' + i + ': ' + a); 
           i++;
       } 
   }

   public void finish(Database.BatchableContext info) {     
   } 
}

Best Answer

Related Solutions

[SalesForce] Iterator and Iterable issue – must implement the method: System.Iterable Database.Batchable.start(Database.BatchableContext)

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