C# 过滤mongodb数据
我有以下型号: 基类:C# 过滤mongodb数据,c#,.net,mongodb,mongodb-.net-driver,C#,.net,Mongodb,Mongodb .net Driver,我有以下型号: 基类: public abstract class Identifiable{ private ObjectId id; private string name; protected Identifiable(){ id = ObjectId.GenerateNewId(); } [BsonId] public ObjectId Id{ get { return id; } set
public abstract class Identifiable{
private ObjectId id;
private string name;
protected Identifiable(){
id = ObjectId.GenerateNewId();
}
[BsonId]
public ObjectId Id{
get { return id; }
set { id = value; }
}
[BsonRequired]
public string Name{
get { return name; }
set { name = value; }
}
}
名称是唯一的。频道类
public class Channel : Identifiable{
private DateTime creationDate;
private string url;
private DailyPrograming dailyPrograming;
public DailyPrograming DailyPrograming{
get { return dailyPrograming; }
set { dailyPrograming = value; }
}
public DateTime CreationDate{
get { return creationDate; }
set { creationDate = value; }
}
public string Url{
get { return url; }
set { url = value; }
}
}
每日节目。name属性是存储为ddMMyyyy的日期:
public class DailyPrograming : Identifiable{
public DailyPrograming(){
DailyPrograms = new List<Program>(30);
}
public IList<Program> DailyPrograms { get; set; }
}
现在,我想使用以下方法过滤特定频道的节目,以获取特定日期:
public DailyPrograming GetProgramsForDate(string channelId, string prgDate){
ObjectId id = new ObjectId(channelId);
IMongoQuery query = Query.And(Query<Channel>.EQ(c => c.Id, id),
Query<DailyPrograming>.EQ(dp => dp.Name, prgDate));
var result = Database.GetCollection<DailyPrograming>(CollectionName).Find(query).FirstOrDefault();
return result;
}
public daily编程GetProgramsForDate(字符串channelId,字符串prgDate){
ObjectId=新ObjectId(channelId);
IMongoQuery=query.And(query.EQ(c=>c.Id,Id),
EQ(dp=>dp.Name,prgDate));
var result=Database.GetCollection(CollectionName).Find(query).FirstOrDefault();
返回结果;
}
但它从不返回现有数据。如何检索日期频道的节目?
-根据您的样本,我使用了
id=“54c00c65c215161c7ce2a77c”
和prgDate=“2212015”
然后我将查询更改为:
var collection = database.GetCollection<Channel>("test6");
var id = new ObjectId("54c00c65c215161c7ce2a77c");
var query = Query.And(Query<Channel>.EQ(c => c.Id, id), Query<Channel>.EQ(c => c.DailyPrograming.Name, "2212015"));
var result = collection.Find(query).FirstOrDefault();
var collection=database.GetCollection(“test6”);
变量id=新对象id(“54c00c65c215161c7ce2a77c”);
var query=query.And(query.EQ(c=>c.Id,Id),query.EQ(c=>c.DailyPrograming.Name,“2212015”);
var result=collection.Find(query.FirstOrDefault();
这个查询很好用
有一点:
您的收藏类型是Chanel
而不是daily programming
当您的收藏是香奈儿时,您必须使用Query
并通过Query.EQ(c=>c.DailyPrograming.Name,“2212015”)查询嵌套DailyPrograming
var builder=Builders.Filter;
var filt=builder.Eq(“价格”、“9.20”)和builder.Eq(“产品名”、“WH-208”);
var list=await collection.Find(filt.toListSync();
我们可以使用“&”,而不是使用$and 处理日常编程
集合时的查询
没有任何意义。如果其possible@Disposer当然可以,谢谢。这是我在众多方法中的第一个,但不幸的是,当在ddbb中使用已知的现有值进行测试时,它返回null。它工作正常,感谢您的帮助!我仍在努力避免在关系世界中思考。
var collection = database.GetCollection<Channel>("test6");
var id = new ObjectId("54c00c65c215161c7ce2a77c");
var query = Query.And(Query<Channel>.EQ(c => c.Id, id), Query<Channel>.EQ(c => c.DailyPrograming.Name, "2212015"));
var result = collection.Find(query).FirstOrDefault();
var builder = Builders<BsonDocument>.Filter;
var filt = builder.Eq("Price", "9.20") & builder.Eq("ProductName","WH-208");
var list =await collection.Find(filt).ToListAsync();