我正在尝试使用LINQ从数据库中检索一些记录以及计数。
DataTable dtByRecipe = (from tbrp in context.tblRecipeParents
join tbrc in context.tblRecipeChilds on tbrp.RecipeParentID equals tbrc.RecipeParentID
join tbp in context.tblProducts on tbrc.ProductID equals tbp.ProductID
join tbps in context.tblProductSales.AsEnumerable()
on tbp.ProductID equals tbps.ProductID
join tbs in context.tblSales.AsEnumerable()
on tbps.ProductSalesID equals tbs.ProductSalesID select new
{
tbrp.Recipe,
tbp.ProductID,
tbps.ProductSalesID,
tbrp.Yield,
Product = tbp.ProductCode + " - " + tbp.ProductDescription,
ProductYield = tbrp.Yield,
TotalYield = "XXX",
Cost = "YYY"
}).AsEnumerable()
.Select(item => new {
item.Recipe,
Count = GetCount(item.ProductID, item.ProductSalesID, context),
item.Yield,
Product = item.Product,
ProductYield = item.ProductYield,
TotalYield = "XXX",
Cost = "YYY"
}).OrderBy(o => o.Recipe).ToDataTable();
private int GetCount ( int ProductID, int ProductSalesID, MTBARKER_DBEntities context )
{
int query = ( from tbps in context.tblProductSales
join tbp in context.tblProducts on tbps.ProductID equals tbp.ProductID
join tbs in context.tblSales
on tbps.ProductSalesID equals tbs.ProductSalesID
where tbp.ProductID == ProductID && tbps.ProductSalesID == ProductSalesID
select tbs ).Count();
return query;
}
在上面的查询中,我得到了预期的结果,但由于数据库中有大约10K条记录,因此产生结果需要花费大量时间。问题在于我用以下方法来计算。
Count = GetCount(item.ProductID, item.ProductSalesID, context),
有什么有效的方法可以阻止这个问题吗?
答案 0 :(得分:2)
存储过程良好是性能的最佳选择。使用实体框架中的存储过程进行选择和报告。