Question

我对我需要的报告感到很困惑。截至今天，我的大多数报告都很简单，所以我能够轻松地完成这些工作。但作为sql / dlinq的新手，我无法通过以下方式找到答案：

var closingStock =
    (from p in session.Query<Product>()
    select new
    {
        p.Id,
        p.Name,
        p.Batch,
        p.Rate,
        ClosingStock = p.Quantity - p.AllocatedQuantity,
        p.DivisionId
    }).ToList();

var distributedQuantityAfterPeriod =
    (from i in session.Query<OutwardInvoiceItem>()
    where i.ParentInvoice.Date > ToDate 
    select new
    {
        Id = i.Product.Id,
        DistributedAfter = i.Quantity
    }).ToList();

var distributedQuantityInPeriod =
    (from i in session.Query<OutwardInvoiceItem>()
    where i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate
    select new
    {
        Id = i.Product.Id,
        Distributed = i.Quantity
    }).ToList();

var receivedQuantityAfterPeriod =
    (from i in session.Query<InwardInvoiceItem>()
    where i.ParentInvoice.Date > ToDate
    select new
    {
        Id = i.Product.Id,
        ReceivedAfter = i.Quantity
    }).ToList();

var receivedQuantityInPeriod =
    (from i in session.Query<InwardInvoiceItem>()
    where i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate
    select new
    {
        Id = i.Product.Id,
        Received = i.Quantity
    }).ToList();

如您所见，我正在尝试为特定日期制作库存移动报告。我有以下问题：
1.如何减少五个查询？有可能吗？
2.如何将这些查询提供的数据合并到一个表中，该表按产品ID分组并在数量相关列上求和？截至目前，我正在使用非常慢的循环。

我在用什么：
C＃4，nHibernate，Sqlite

任何帮助都将受到高度赞赏。

此致约杰什。

Answer 1

使用.Future()代替.List()

让所有查询返回

group i by i.Id into g
select new
{
    Id = g.Key,
    Quantity = g.Sum(x => x.Quantity)
}).Future();

并做

var alltogether = groupedDistributedQuantityAfterPeriod
    .Concat(groupedDistributedQuantityInPeriod)
    .Concate(...);

from g in alltogether
group g by g.key into all
select new
{
    Id = all.Key,
    Quantity = all.Sum(x => x.Quantity)
};

更新

您可以使用

from i in session.Query<OutwardInvoiceItem>()
where (i.ParentInvoice.Date > ToDate) || (i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate)
select ...

from i in session.Query<InwardInvoiceItem>()
where (i.ParentInvoice.Date > ToDate) || (i.ParentInvoice.Date >= FromDate && i.ParentInvoice.Date <= ToDate)
select ...

如何基于列将5种不同类型的linq查询合并为一种

1 个答案: