Question

我试图在VB.NET中为mongodb用户聚合框架作为MAP reduce的替代方案。我的收藏有很多像这样的文件

    { "_id" : ObjectId("54a9542e32219b1894f38199"),
  "sesion" : "vw01q45m4c5ir45opjhncun-04012015155437",
  "prio" : 0,
  "ptun" : 78.48,
  "meta" : {
    "id_array" : 0,
    "deption" : "Main Type 1",
    "des" : "MAL",
    "reg" : "sub type 1",
    "princ" : "78,48",
    "Xref" : "ref external ID",
    "XNRF" : false
  },
  "hora" : new Date("4/1/2015 15:54:38")
}

我想获得一个定义的“id_array”字段，所有以这种方式分组的对象。对于相同的“deption”，“reg”将文档用较低的ptun字段，但我得到0结果。

我的代码（我真的是这个框架的新手）。任何帮助将非常感激

valorint = 52
        Dim operacionmatch2 = New BsonDocument() From { _
            {"$match", New BsonDocument() From { _
                {"meta.id_array", valorint}}}}


        Dim groupFamiliesOperation2 = New BsonDocument() From { _
         {"$group", New BsonDocument() From { _
             {"_id", New BsonDocument() From { _
              {"deption", "$meta.deption"}, {"reg", "$meta.reg"} _
             }}, _
             {"Minimo", New BsonDocument() From { _
                 {"$min", "$meta.ptun"} _
             }}}}}


        Dim sortidOperation = New BsonDocument() From { _
            {"$sort", New BsonDocument() From { _
                {"id_array", 1} _
            }} _
        }


        Dim j As AggregateResult

        j = transactions.Aggregate(operacionmatch2, groupFamiliesOperation2, sortidOperation)
        Console.WriteLine(" inicia consulta " & Now())

        For Each jj In j.ResultDocuments
            Dim b = 3
            Console.WriteLine(jj.ToBsonDocument())
        Next

在vb.net中mongodb聚合没有结果

0 个答案: