我如何插入将许多对象添加到 C# 中的列表 MongoDB.Driver
How do i insert Adds many objects to the the List In c# MongoDB.Driver
如何在 c# 中将多个对象插入列表 MongoDB.Driver?
我的 c# 实体
/// <summary>LogTest</summary>
public class VisitLog
{
/// <summary>MongoDB特有的字段</summary>
[MongoDB.Bson.Serialization.Attributes.BsonElement("_id")]
[JsonConverter(typeof(ObjectIdConverter))]
public MongoDB.Bson.ObjectId MongoId { get; set; }
/// <summary>YMD datetime</summary>
public int Yymmdd { get; set; }
/// <summary>Visitor</summary>
public string Visitor { get; set; }
/// <summary>VisitInfos</summary>
public List<VisitInfo> VisitInfos { get; set; }
}
在MongoDBCode中点赞代码
// 1
{
"_id": ObjectId("5f506eb02000a9b52d72a600"),
"Yymmdd": NumberInt("20200903"),
"Visitor": "360spider",
"VisitInfos": [ ]
}
我会将对象添加到“VisitInfos”:[ ]
如何在 c# 中将多个对象插入列表 MongoDB.Driver?
方式一:只插入一个对象。我的测试代码是:
var filter = Builders<VisitLog>.Filter.Eq("_id", item.MongoId);
var update = Builders<VisitLog>.Update.Push("VisitInfos", new VisitInfo { Visitor = Visitor, Browser = "IE", Ip = "192.168.1.1", Createtime = DateTime.Now.ToUnixTimeLocalIslong() });
var result = BB.UpdateOne(filter, update);
方法 2:我想插入 InsertManyAsync
var items = BB.Find(x => x.Yymmdd.Equals(Yymmdd) && x.Visitor.Equals(Visitor)).Project<VisitLog>(fields).ToList();
if (items.Count > 0)
{
var item = items[0];
var VisitInfos = new List<VisitInfo>();
for (int j = 0; j < 10000; j++)
{
VisitInfos.Add(new VisitInfo { Visitor = Visitor, Browser = "IE", Ip = "192.168.1.1", Createtime = DateTime.Now.ToUnixTimeLocalIslong() });
}
var filter = Builders<VisitLog>.Filter.Eq("_id", item.MongoId);
var update = Builders<VisitLog>.Update.Push("VisitInfos", VisitInfos);
var result = BB.UpdateOne(filter, update);
}
方式2失败
请帮助我。
这个非常.....
在 Builders<Order>.Update
上有一个 PushEach
接受 IEnumerable
。这相当于做:
{ $push: { scores: { $each: [ 90, 92, 85 ] } } }
https://docs.mongodb.com/manual/reference/operator/update/push/#append-multiple-values-to-an-array
为简单起见,这里有一个订单和订单商品的示例。
在 MongoDB 中我们将有:
> db.orders.find()
{ "_id" : ObjectId("5f50aef4d7d9f967d0322932"), "Items" : [ ] }
然后我们将执行以下 C# 代码。
var client = new MongoClient();
var db = client.GetDatabase("test");
var items = db.GetCollection<Order>("orders");
var filter = Builders<Order>.Filter.Empty;
var update = Builders<Order>.Update.PushEach(x => x.Items, new[]
{
new OrderItem{Name = "Order 1", Price = 10.1M},
new OrderItem{Name = "Order 2", Price = 20.2M}
});
await items.UpdateOneAsync(filter, update);
public class Order
{
public ObjectId Id { get; set; }
public List<OrderItem> Items { get; set; }
= new List<OrderItem>();
}
public class OrderItem
{
public string Name { get; set; }
public decimal Price { get; set; }
}
现在,如果我们查看 MongoDB 中的文档,我们会将 2 项添加到我们的数组中
db.orders.find().pretty()
{
"_id" : ObjectId("5f50aef4d7d9f967d0322932"),
"Items" : [
{
"Name" : "Order 1",
"Price" : "10.1"
},
{
"Name" : "Order 2",
"Price" : "20.2"
}
]
}
如何在 c# 中将多个对象插入列表 MongoDB.Driver?
我的 c# 实体
/// <summary>LogTest</summary>
public class VisitLog
{
/// <summary>MongoDB特有的字段</summary>
[MongoDB.Bson.Serialization.Attributes.BsonElement("_id")]
[JsonConverter(typeof(ObjectIdConverter))]
public MongoDB.Bson.ObjectId MongoId { get; set; }
/// <summary>YMD datetime</summary>
public int Yymmdd { get; set; }
/// <summary>Visitor</summary>
public string Visitor { get; set; }
/// <summary>VisitInfos</summary>
public List<VisitInfo> VisitInfos { get; set; }
}
在MongoDBCode中点赞代码
// 1
{
"_id": ObjectId("5f506eb02000a9b52d72a600"),
"Yymmdd": NumberInt("20200903"),
"Visitor": "360spider",
"VisitInfos": [ ]
}
我会将对象添加到“VisitInfos”:[ ]
如何在 c# 中将多个对象插入列表 MongoDB.Driver?
方式一:只插入一个对象。我的测试代码是:
var filter = Builders<VisitLog>.Filter.Eq("_id", item.MongoId);
var update = Builders<VisitLog>.Update.Push("VisitInfos", new VisitInfo { Visitor = Visitor, Browser = "IE", Ip = "192.168.1.1", Createtime = DateTime.Now.ToUnixTimeLocalIslong() });
var result = BB.UpdateOne(filter, update);
方法 2:我想插入 InsertManyAsync
var items = BB.Find(x => x.Yymmdd.Equals(Yymmdd) && x.Visitor.Equals(Visitor)).Project<VisitLog>(fields).ToList();
if (items.Count > 0)
{
var item = items[0];
var VisitInfos = new List<VisitInfo>();
for (int j = 0; j < 10000; j++)
{
VisitInfos.Add(new VisitInfo { Visitor = Visitor, Browser = "IE", Ip = "192.168.1.1", Createtime = DateTime.Now.ToUnixTimeLocalIslong() });
}
var filter = Builders<VisitLog>.Filter.Eq("_id", item.MongoId);
var update = Builders<VisitLog>.Update.Push("VisitInfos", VisitInfos);
var result = BB.UpdateOne(filter, update);
}
方式2失败
请帮助我。 这个非常.....
在 Builders<Order>.Update
上有一个 PushEach
接受 IEnumerable
。这相当于做:
{ $push: { scores: { $each: [ 90, 92, 85 ] } } }
https://docs.mongodb.com/manual/reference/operator/update/push/#append-multiple-values-to-an-array
为简单起见,这里有一个订单和订单商品的示例。
在 MongoDB 中我们将有:
> db.orders.find()
{ "_id" : ObjectId("5f50aef4d7d9f967d0322932"), "Items" : [ ] }
然后我们将执行以下 C# 代码。
var client = new MongoClient();
var db = client.GetDatabase("test");
var items = db.GetCollection<Order>("orders");
var filter = Builders<Order>.Filter.Empty;
var update = Builders<Order>.Update.PushEach(x => x.Items, new[]
{
new OrderItem{Name = "Order 1", Price = 10.1M},
new OrderItem{Name = "Order 2", Price = 20.2M}
});
await items.UpdateOneAsync(filter, update);
public class Order
{
public ObjectId Id { get; set; }
public List<OrderItem> Items { get; set; }
= new List<OrderItem>();
}
public class OrderItem
{
public string Name { get; set; }
public decimal Price { get; set; }
}
现在,如果我们查看 MongoDB 中的文档,我们会将 2 项添加到我们的数组中
db.orders.find().pretty()
{
"_id" : ObjectId("5f50aef4d7d9f967d0322932"),
"Items" : [
{
"Name" : "Order 1",
"Price" : "10.1"
},
{
"Name" : "Order 2",
"Price" : "20.2"
}
]
}