【发布时间】：2016-04-22 10:50:30
【问题描述】：
这是我的 linq 查询，这需要很长时间才能执行。任何人都可以建议我如何让它更快。我在这个查询中使用了一些函数来动态计算数据。当我删除这些函数时，这个查询运行得很快，但我必须使用这些函数以正确的方式获取数据。请有人建议我如何改进这个查询
var l = from a in GetItemList(con)
join product in GetProductStock(con) on
a.Id
equals product.Id
into prodList
from prod in prodList.DefaultIfEmpty()
join brand in GetBrandStock(con) on
a.PbPairId equals brand.Id
into brandList
from bran in brandList.DefaultIfEmpty()
join pack in GetPackStock(con) on
a.PbpPairId equals pack.Id
into packList
from pac in packList.DefaultIfEmpty()
join np in RtbVoucherVoPurSalItem.GetTotalBuySellByItemForNormal(con) on a.Id equals np.ItemId
into npl
from npv in npl.DefaultIfEmpty()
join pp in RtbVoucherVoPurSalItem.GetTotalBuySellByItemForNormal(con) on a.Id equals pp.ItemId
into ppl
from ppv in ppl.DefaultIfEmpty()
select
new RsXtraProductListWithClosing
{
Id = a.Id,
PbPairId = a.PbPairId,
PbpPairId = a.PbpPairId,
ProductId = a.ProductId,
BrandId = a.BrandId,
PackId = a.PackId,
DesignNoId = a.DesignNoId,
Product = a.Product.Trim(),
Brand = a.Brand.Trim(),
Pack = a.Pack.Trim(),
DesignNo = a.DesignNo.Trim(),
QuantityUnitId = a.QuantityUnitId,
RateUnitId = a.RateUnitId,
AskDesignNo = a.AskDesignNo,
AskCustomSize = a.AskCustomSize,
AskDesignNoRate = a.AskDesignNoRate,
UseBachNumber = a.UseBachNumber,
UseExpDate = a.UseExpDate,
UseManfacDate = a.UseManfacDate,
AskD = a.AskD,
AskH = a.AskH,
AskW = a.AskW,
SaD = a.SaD,
SaH = a.SaH,
SaW = a.SaW,
SaleByPump = a.SaleByPump,
ScalGroup = a.ScalGroup,
CalculationUnitId = a.CalculationUnitId,
UnitSize = a.UnitSize,
LowStockQuantity = a.LowStockQuantity,
OverStockQuantity = a.OverStockQuantity,
SizeAs = a.SizeAs,
UseDirectDiscount = a.UseDirectDiscount,
Discount = a.Discount,
PurchaseRate1 = a.PurchaseRate1,
PurchaseRate2 = a.PurchaseRate2,
PurchaseRate3 = a.PurchaseRate3,
PurchaseOtherRate = a.PurchaseOtherRate,
SaleRate1 = a.SaleRate1,
SaleRate2 = a.SaleRate2,
SaleRate3 = a.SaleRate3,
SaleOtherRate = a.SaleOtherRate,
LockOtherPurchaseRate = a.LockOtherPurchaseRate,
LockOtherSaleRate = a.LockOtherSaleRate,
LockSaleRate = a.LockSaleRate,
LockPurchaseRate = a.LockPurchaseRate,
ProductClosingStock = ((a.Pobu ?? prod.OpeningStock ?? 0) + (npv.Quantaty ?? 0)),
ProductCClosingStock = ((a.CPobu ?? prod.COpeningStock ?? 0) + (ppv.Quantaty ?? 0)),
BrandClosingStock = ((a.Bobu ?? bran.OpeningStock ?? 0) + (npv.Quantaty ?? 0)),
BrandCClosingStock = ((a.CBobu ?? bran.COpeningStock ?? 0) + (ppv.Quantaty ?? 0)),
PackClosingStock = ((a.Paobu ?? pac.OpeningStock ?? 0) + (npv.Quantaty ?? 0)),
PackCClosingStock = ((a.CPaobu ?? pac.COpeningStock ?? 0) + (ppv.Quantaty ?? 0)),
DesignNoClosingStock = ((a.Dobu ?? 0) + (npv.Quantaty ?? 0)),
DesignNoCClosingStock = ((a.CDobu ?? 0) + (ppv.Quantaty ?? 0))
};
return l;
and this are the other functions helping this query
public static IQueryable<RsXtraOpeningStock> GetPackStock(RdbCompany con)
{
return con.RtbInventoryProductBrandPackDesignNoPairs
.GroupBy(p => p.BrandPackPairId).Select(
g => new RsXtraOpeningStock
{
Id = g.Key,
OpeningStock = (g.Sum(m => m.OpeningStock) ?? 0),
COpeningStock = (g.Sum(m => m.COpenigStock) ?? 0),
});
}
public static IQueryable<RsXtraOpeningStock> GetBrandStock(RdbCompany con)
{
return from d in con.RtbInventoryProductBrandPackPairs
join pk in GetPackStock(con) on d.Id equals pk.Id
into pkl
from pkd in pkl.DefaultIfEmpty()
group new{d,pkd} by d.BrandPairId
into g
select new RsXtraOpeningStock
{
Id = g.Key,
OpeningStock = ((g.Sum(a => (decimal?)(a.d.OpeningStock ?? a.pkd.OpeningStock))??0)),
COpeningStock = ((g.Sum(a => (decimal?)(a.d.COpenigStock ?? a.pkd.COpeningStock))??0))
};
}
public static IQueryable<RsXtraOpeningStock> GetProductStock(RdbCompany con)
{
return from d in con.RtbInventoryProductBrandPairs
join br in GetBrandStock(con) on d.Id equals br.Id
into brl
from brd in brl.DefaultIfEmpty()
group new { d, brd } by d.ProductId
into g
select new RsXtraOpeningStock
{
Id = g.Key,
OpeningStock = ((g.Sum(a => (decimal?)(a.d.OpeningStock ?? a.brd.OpeningStock)) ?? 0)),
COpeningStock = ((g.Sum(a => (decimal?)(a.d.COpenigStock ?? a.brd.COpeningStock)) ?? 0))
};
}
public static IQueryable<RsXtraItemFinalBuySellByMode> GetTotalBuySellByItemForPure(RdbCompany con)
{
var stockActiveArray = RsXtraVoucherHelperArray.GetActiveStockVoucherType();
return GetList(con).Where(
a => stockActiveArray.Contains(a.FkVoucherVoMain.FkVoucher.FkVoucherGroup.VoucherType)
&& a.FkVoucherVoMain.CompanyId == RsXtraMainInnerObj.CurrentCompany.Id
&& a.FkVoucherVoMain.BranchId == RsXtraMainInnerObj.CurrentHierarchy.Id
&& a.FkVoucherVoMain.Mode == RenumMode.P
)
.GroupBy(a => new {a.ItemId})
.Select(a => new RsXtraItemFinalBuySellByMode
{
ItemId = a.Key.ItemId,
Quantaty = a.Sum(c => (decimal?)c.Quantaty)
});
}
public static IQueryable<RsXtraItemFinalBuySellByMode> GetTotalBuySellByItemForNormal(RdbCompany con)
{
var stockActiveArray = RsXtraVoucherHelperArray.GetActiveStockVoucherType();
return GetList(con).Where(
a => stockActiveArray.Contains(a.FkVoucherVoMain.FkVoucher.FkVoucherGroup.VoucherType)
&& a.FkVoucherVoMain.CompanyId == RsXtraMainInnerObj.CurrentCompany.Id
&& a.FkVoucherVoMain.BranchId == RsXtraMainInnerObj.CurrentHierarchy.Id
&& a.FkVoucherVoMain.Mode != RenumMode.P
)
.GroupBy(a => new { a.ItemId })
.Select(a => new RsXtraItemFinalBuySellByMode
{
ItemId = a.Key.ItemId,
Quantaty = a.Sum(c => (decimal?)c.Quantaty)
});
}
【问题讨论】：
-
我怀疑所有这些
GroupBy语句要么创建包含许多CROSS JOIN子句的怪异SQL 语句，要么发出大量SQL 语句。您必须检查 Sql Server Profiler。您可能应该在几个 LINQ 语句中分解此任务。
标签： c# .net linq linq-to-sql