LINQ 查询多个组和最新记录的计数 - Oracle DB

Question

我试图将 Linq 查询分为 3 个（总计、成功、失败），但到目前为止“总计”Linq 查询工作正常。 请帮我获取“成功”、“失败”列（它有多种状态，我们必须检查每个事务的最后一列和目的地） 注意：您需要按 ProcessTime、TransactionId、Destination 分组并检查最后一列是否是成功还是失败然后应用计数（我们使用 oracle 作为后端）

总计数的 LINQ

 var query = (from filetrans in context.FILE_TRANSACTION
                             join route in context.FILE_ROUTE on filetrans.FILE_TRANID equals route.FILE_TRANID
                             where 
                                filetrans.PROCESS_STRT_TIME >= fromDateFilter && filetrans.PROCESS_STRT_TIME <= toDateFilter 
                             select new { PROCESS_STRT_TIME = DbFunctions.TruncateTime((DateTime)filetrans.PROCESS_STRT_TIME), filetrans.FILE_TRANID, route.DESTINATION }).
                             GroupBy(p => new { p.PROCESS_STRT_TIME, p.FILE_TRANID, p.DESTINATION });
                var result = query.GroupBy(x => x.Key.PROCESS_STRT_TIME).Select(x => new { x.Key, Count = x.Count() }).ToDictionary(a => a.Key, a => a.Count);

Answer 1

现在我认为没有必要让它太复杂； 我不会费心将另一个表加入连接，然后查看事务 ID 的末尾以在事物的 DB 端找到“成功”或“失败”一词（尤其是因为它们有拼写错误）。 您所有的状态 ID 都很好，即使成功也很奇怪，但我会全部下载它们，分组：

var query = (from filetrans in context.FILE_TRANSACTION
    join route in context.FILE_ROUTE on filetrans.FILE_TRANID equals route.FILE_TRANID
    where 
      filetrans.PROCESS_STRT_TIME >= fromDateFilter && filetrans.PROCESS_STRT_TIME <= toDateFilter 
      select new { 
        PROCESS_STRT_TIME = DbFunctions.TruncateTime((DateTime)filetrans.PROCESS_STRT_TIME),
        STAT = route.FILE_STATUS_ID < 7 ? route.FILE_STATUS_ID % 2 : 2
      }
  ).GroupBy(p => p) 
  .ToDictionary(g => g.Key, g => g.Count());

您最终的 STAT 为 0 表示成功，1 表示失败或 2 表示已完成

如果你想要总数，只需在本地 Sum()

Answer 2

检查此解决方案。 如果它给出错误的结果，那么我需要更多的细节。

var fileTransQuery =
    from filetrans in context.AFRS_FILE_TRANSACTION
    where accountIds.Contains(filetrans.ACNT_ID) &&
      filetrans.PROCESS_STRT_TIME >= fromDateFilter && filetrans.PROCESS_STRT_TIME <= toDateFilter
    select filetrans;

var routesQuery =
    from filetrans in fileTransQuery
    join route in context.AFRS_FILE_ROUTE on filetrans.FILE_TRANID equals route.FILE_TRANID
    select route;

var lastRouteQuery = 
    from d in routesQuery.Select(route => new { route.FILE_TRANID, route.DESTINATION }).Distinct()
    from route in routesQuery
        .Where(route => d.FILE_TRANID == route.FILE_TRANID && d.DESTINATION == route.DESTINATION)
        .OrderByDescending(route => route.ROUTE_ID)
        .Take(1)
    select route;

var recordsQuery =
    from filetrans in fileTransQuery
    join route in lastRouteQuery on filetrans.FILE_TRANID equals route.FILE_TRANID
    select new { filetrans.PROCESS_STRT_TIME, route.CRNT_ROUTE_FILE_STATUS_ID };

var result = recordsQuery
    .GroupBy(p => DbFunctions.TruncateTime((DateTime)p.PROCESS_STRT_TIME))
    .Select(g => new TrendData
    {
        TotalCount = g.Sum(x => x.CRNT_ROUTE_FILE_STATUS_ID != 7 && x.CRNT_ROUTE_FILE_STATUS_ID != 8 ? 1 : 0)
        SucccessCount = g.Sum(x => x.CRNT_ROUTE_FILE_STATUS_ID == 7 ? 1 : 0),
        FailCount = g.Sum(x => failureStatus.Contains(x.CRNT_ROUTE_FILE_STATUS_ID) ? 1 : 0),
        Date = g.Min(x => x.PROCESS_STRT_TIME)
    })
    .OrderBy(x => x.Date)
    .ToList();