[英]mongodb c# driver join query
public class Person
{
public ObjectId _id { get; set; }
public int AddressID { get; set; }
public int Age { get; set; }
public Person Father { get; set; }
public string ID { get; set; }
public double Income { get; set; }
public string Name { get; set; }
}
public class Address
{
public ObjectId _id { get; set; }
public int HouseNo { get; set; }
public int ID { get; set; }
public string Street { get; set; }
}
我如何通過街道獲得收入總和? 通過使用 mongodb c# 驅動程序
按年齡獲得收入。
var personcollection = this.cdb.GetCollection<Person>("person");
var aggregate = personcollection.Aggregate()
.Group(new BsonDocument { { "_id", "$Age" }, { "sum", new BsonDocument("$sum", "$Income") } });
var results = await aggregate.ToListAsync();
但我知道如何為單個查詢鏈接兩個文檔。
謝謝你的幫助。
這聞起來像是架構設計缺陷。
您應該將地址文檔嵌入到Person
文檔中:
public class Person
{
public ObjectId _id { get; set; }
public Address Address { get; set; }
public int Age { get; set; }
public Person Father { get; set; }
public string ID { get; set; }
public double Income { get; set; }
public string Name { get; set; }
}
public class Address
{
public ObjectId _id { get; set; }
public int HouseNo { get; set; }
public int ID { get; set; }
public string Street { get; set; }
}
然后您可以輕松地執行請求的查詢(以修改您現有的查詢)
var personcollection = this.cdb.GetCollection<Person>("person");
var aggregate = personcollection.Aggregate()
.Group(new BsonDocument { { "_id", "$Address.Street" }, { "sum", new BsonDocument("$sum", "$Income") } });
var results = await aggregate.ToListAsync();
請注意使用點符號來訪問嵌入的文檔 - Address.Street
我知道這是一個舊線程 - 但我正在編寫一個與“查找”相關的問題,我發現了這個。 如果有人通過搜索到達,值得注意的是,現在 MongoDB 中的“連接”管道已經就緒。
如果您有正確的 MongoDB 和驅動程序版本(分別為 3.2 和 2.2 - 我認為),那么您可以在聚合管道中使用“查找”來連接兩個 ID 表。
我確實是這樣查找的:
MongoDB
db.dbACESSO.aggregate([
{$match: {PartnerId: "2021", CD_CLIENTE: 4003}},
{$lookup: {from: "GRUPO_UNIDADE", localField: "CD_GRUPO_UNIDADE", foreignField: "CD_GRUPO_UNIDADE", as: "GRUPO"}},
{$lookup:{from: "UNIDADE", localField: "CD_UNIDADE", foreignField: "CD_UNIDADE",as: "UNIDADE"}},
{$unwind: "$GRUPO"},
{$unwind: "$UNIDADE"},
{ $project: { _id: 0, CD_CLIENTE : 1, CD_ACESSO : 1, NOME : 1, EMAIL : 1, FG_KIPER_MOBILE : 1, CD_GRUPO_UNIDADE : 1, CD_UNIDADE : 1,
GRUPO: "$GRUPO.NM_DESCRICAO", UNIDADE : "$UNIDADE.NM_DESCRICAO",
NU_TELEFONE: { $cond: [{ $eq : ["$NU_TELEFONE", { }] }, "", "$NU_TELEFONE"] },
TAG: { $cond: [{ $eq: ["$NU_KIPER_TAG", { }] }, 0, 1] },
CONTROLE: { $cond: [{ $eq: ["$NU_KIPER_RF", { }] }, 0, 1] },
APPATIVO: { $cond: [{ $eq: ["$KEY_HASH", { }] }, "", "$KEY_HASH"] } }
}
])
C# 驅動程序
var match = new BsonDocument { { "$match", new BsonDocument { { "PartnerId", cliente }, { "CD_CLIENTE", codCond } } } };
var lookup1 = new BsonDocument { { "$lookup", new BsonDocument { { "from", "GRUPO_UNIDADE" }, { "localField", "CD_GRUPO_UNIDADE" }, { "foreignField", "CD_GRUPO_UNIDADE" }, { "as", "GRUPO" } } } };
var lookup2 = new BsonDocument { { "$lookup", new BsonDocument { { "from", "UNIDADE" }, { "localField", "CD_UNIDADE" }, { "foreignField", "CD_UNIDADE" }, { "as", "UNIDADE" } } } };
var unwind1 = new BsonDocument("$unwind", "$GRUPO");
var unwind2 = new BsonDocument("$unwind", "$UNIDADE");
var project = new BsonDocument
{
{
"$project", new BsonDocument
{
{ "_id", 0},
{ "CD_CLIENTE", 1},
{ "CD_ACESSO", 1 },
{ "NOME", 1},
{ "EMAIL", 1 },
{ "FG_KIPER_MOBILE", 1 },
{ "CD_GRUPO_UNIDADE", 1 },
{ "CD_UNIDADE", 1 },
{ "GRUPO", "$GRUPO.NM_DESCRICAO" },
{ "UNIDADE", "$UNIDADE.NM_DESCRICAO" },
{ "NU_TELEFONE", new BsonDocument{{ "$cond", new BsonArray{new BsonDocument{{"$eq", new BsonArray{ "$NU_TELEFONE", new BsonDocument { } } }}, "","$NU_TELEFONE" } }}},
{ "TAG", new BsonDocument{{ "$cond", new BsonArray{new BsonDocument{{"$eq", new BsonArray{ "$NU_KIPER_TAG", new BsonDocument { } } }}, 0, 1 } }}},
{ "CONTROLE", new BsonDocument{{ "$cond", new BsonArray{new BsonDocument{{"$eq", new BsonArray{ "$NU_KIPER_RF", new BsonDocument { } } }}, 0, 1 } }}},
{ "APP", new BsonDocument{{ "$cond", new BsonArray{new BsonDocument{{"$eq", new BsonArray{ "$FG_KIPER_MOBILE", false } }}, 0, 1 } }}},
{ "APPATIVO", new BsonDocument{{ "$cond", new BsonArray{new BsonDocument{{"$eq", new BsonArray{ "$KEY_HASH", new BsonDocument { } } }}, "", "$KEY_HASH" } }}}
}
}
};
var pipeline = new[] { match, lookup1, lookup2, unwind1, unwind2, project };
var result = collection.Aggregate<BsonDocument>(pipeline).ToList();
var lista = JsonConvert.DeserializeObject<List<UsuariosAcessos>>(result.ToJson()).ToList();
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