How to manage the reports with database using Bold Reports Report Designer

You can use ExternalServer to manage the reports within SQL server database. Find the following code for accessing the existing reports, datasources and datasets from SQL server ExternalServer database.

public override List<CatalogItem> GetItems(string folderName, ItemTypeEnum type)
        {
            List<CatalogItem> _items = new List<CatalogItem>();
            string targetFolder = HttpContext.Current.Server.MapPath("~/") + @"App_Data\ReportServer\";

            if (type == ItemTypeEnum.Folder || type == ItemTypeEnum.Report)
            {
                targetFolder = targetFolder + @"Report\";
                if (!(string.IsNullOrEmpty(folderName) || folderName.Trim() == "/"))
                {
                    targetFolder = targetFolder + folderName;
                }
            }

            if (type == ItemTypeEnum.DataSet)
            {
                foreach (var file in Directory.GetFiles(targetFolder + "DataSet"))
                {
                    CatalogItem catalogItem = new CatalogItem();
                    catalogItem.Name = Path.GetFileNameWithoutExtension(file);
                    catalogItem.Type = ItemTypeEnum.DataSet;
                    catalogItem.Id = Regex.Replace(catalogItem.Name, @"[^0-9a-zA-Z]+", "_");
                    _items.Add(catalogItem);
                }
            }
            else if (type == ItemTypeEnum.DataSource)
            {
                foreach (var file in Directory.GetFiles(targetFolder + "DataSource"))
                {
                    CatalogItem catalogItem = new CatalogItem();
                    catalogItem.Name = Path.GetFileNameWithoutExtension(file);
                    catalogItem.Type = ItemTypeEnum.DataSource;
                    catalogItem.Id = Regex.Replace(catalogItem.Name, @"[^0-9a-zA-Z]+", "_");
                    _items.Add(catalogItem);
                }
            }
            else if (type == ItemTypeEnum.Folder)
            {
                foreach (var file in Directory.GetDirectories(targetFolder))
                {
                    CatalogItem catalogItem = new CatalogItem();
                    catalogItem.Name = Path.GetFileNameWithoutExtension(file);
                    catalogItem.Type = ItemTypeEnum.Folder;
                    catalogItem.Id = Regex.Replace(catalogItem.Name, @"[^0-9a-zA-Z]+", "_");
                    _items.Add(catalogItem);
                }
            }
            else if (type == ItemTypeEnum.Report)
            {
                foreach (var file in Directory.GetFiles(targetFolder, "*.rdl"))
                {
                    CatalogItem catalogItem = new CatalogItem();
                    catalogItem.Name = Path.GetFileNameWithoutExtension(file);
                    catalogItem.Type = ItemTypeEnum.Report;
                    catalogItem.Id = Regex.Replace(catalogItem.Name, @"[^0-9a-zA-Z]+", "_");
                    _items.Add(catalogItem);
                }
            }

            return _items;
        }

You can refer the below application for using the ExternalServer with SQL server ExternalServer Sample

Before the sample running you should update the below attached SQL query in your SQL server. SQL Query