Orchard/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/DataMigration.txt

using System;
using System.Collections.Generic;
using Orchard.ContentManagement.Drivers;
using Orchard.ContentManagement.MetaData;
using Orchard.ContentManagement.MetaData.Builders;
using Orchard.Core.Contents.Extensions;
using Orchard.Data.Migration;

namespace $$FeatureName$$.DataMigrations {
    public class $$ClassName$$DataMigration : DataMigrationImpl {

        public int Create() {
$$Commands$$

            return 1;
        }
    }
}