我有这个查询从一堆商店中检索销售,并将它们作为列表返回。在我的报告请求屏幕上,用户可以按多个 id 进行过滤 - ShopOwnerId、ShopRegionId、ShopTypeCode 等。
我的查询构造为获取所选日期之间的所有销售,然后根据选择进行过滤。这显然是非常低效的。:
private List<Sales> GetFilteredListOfSales(Request reportreq)
{
ModelContainer ctn = new ModelContainer();
List<ShopSale> shopsSales = new List<shopsale>();
// If no filters are selected
//
if (reportreq.RegionalId == null && reportreq.OwnerId == null && reportreq.ShopTypeCode == null)
{
shopsSales = (from sale in ctn.ShopSales
where sale.DateSold >= reportreq.FromDate && sale.DateSold <= reportreq.ToDate
select sale).ToList();
}
// If the regional ID has a value...
//
if (reportreq.RegionalId.HasValue)
{
shopsSales = (from sale in ctn.ShopSales
where sale.Shop.Owner.RegionalId == reportreq.RegionalId
&& sale.DateSold >= reportreq.FromDate && sale.DateSold <= reportreq.ToDate
select sale).ToList();
}
// If the owner ID has a value...
//
if (reportreq.OwnerId.HasValue)
{
shopsSales = (from sale in ctn.ShopSales
where sale.Shop.OwnerId == reportreq.OwnerId
&& sale.DateSold >= reportreq.FromDate && sale.DateSold <= reportreq.ToDate
select sale).ToList();
}
if (!string.IsNullOrEmpty(reportreq.ShopTypeCode))
{
shopsSales = (from sale in ctn.ShopSales
where sale.Shop.ShopTypeCode.ToUpper().Contains(reportreq.ShopTypeCode.ToUpper())
&& sale.DateSold >= reportreq.FromDate && sale.DateSold <= reportreq.ToDate
select sale).ToList();
}
return shopsSales;
}
您可以看到,此方法仅在未选择过滤器时才在特定日期之间查询销售表。
我坚持的是,用户可以选择多个过滤器 - 例如,他们可能选择一个 regionId 和一个 ShopTypeCode,所以我不想为每个 if 过滤器查询 ctn.ShopSales,因为如果不止一个是选择,它将清除以前检索到的值。
有没有人对如何解决这个问题有任何建议?如果需要更多信息,请询问!
谢谢