查询从Mongodb中获取与所有列匹配的数据

Question

我在mongodb中显示如下所示的文档。请让我知道如何获取最新的文档，它与C＃中的域名，主机名和服务（所有三个字段应该匹配）相匹配。

{ 
    "_id" : ObjectId("53e1373e9c2e1805dd895cbd"), 
    "service" : "RAM__Usage", 
    "timestamp" : ISODate("2014-08-08T19:59:47.913Z"), 
    "hostname" : "HOSTXYZ", 
    "Domain" : "DOMXYZ" 
} 
{ 
    "_id" : ObjectId("53e1373e9c2e1805dd895abd"), 
    "service" : "RAM__Usage", 
    "timestamp" : ISODate("2014-09-09T19:59:47.913Z"), 
    "hostname" : "HOSTXYZ", 
    "Domain" : "DOMXYZ" 
} 
{ 
    "_id" : ObjectId("53e1373e9c2e1805dd895abe"), 
    "service" : "CPU__Usage", 
    "timestamp" : ISODate("2014-09-09T19:59:47.913Z"), 
    "hostname" : "HOSTXYZ", 
    "Domain" : "DOMXYZ" 
} 
{ 
    "_id" : ObjectId("53e1373e9c2e1805dd895aff"), 
    "service" : "RAM__Usage", 
    "timestamp" : ISODate("2014-06-06T19:59:47.913Z"), 
    "hostname" : "HOSTABC", 
    "Domain" : "DOMABC" 
} 
{ 
    "_id" : ObjectId("53e1373e9c2e1805dd895agc"), 
    "service" : "CPU__Usage", 
    "timestamp" : ISODate("2014-07-07T19:59:47.913Z"), 
    "hostname" : "HOSTABC", 
    "Domain" : "DOMABC" 
} 

Answer 1

解决方案：

var query = Query.And(Query.EQ("Domain", "DOMXYZ"), Query.EQ("hostname", "HOSTXYZ"), Query.EQ("service", "RAM_USAGE")); 

    //Gets the latest record from MongoDB matching given fileds 
    var bsonCursor = GetMongoDatabase().GetCollection<YourClassName(YourMongoDBCollectionName).Find(query).SetSortOrder(SortBy.Descending("timestamp")).SetLimit(1); 

    foreach (YourClassName objYourClassName in bsonCursor) 
    { 
     //Do your task 
    }