MongoDB内嵌文档操作

实体定义：

    [BsonIgnoreExtraElements]
    public class Person : BaseEntity
    {
        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Password { get; set; }

        public List<Attr> Attribute { get; set; }
    }

    public class Attr
    {
        public string Id { get; set; }

        public string Name { get; set; }
    }

数据库存储内容形式：

{
    "_id" : ObjectId("5af189270d8ef62bb49d045e"),
    "FirstName" : "",
    "LastName" : "",
    "Password" : "",
    "Attribute" : [
        {
            "_id" : "",
            "Name" : ""
        },
        {
            "_id" : "",
            "Name" : ""
        },
        {
            "_id" : "",
            "Name" : ""
        }
    ]
}

1. 删除内嵌字段的值：

如删除Attribute子集合：

 var filter = Builders<Person>.Filter.Where(x => x.Id == id);
 var update = Builders<Person>.Update.Unset(x => x.Attribute);
 var result = this.personRepository.Collection.UpdateOne(filter, update);

2. 删除Attribute集合中Id等于6的内嵌文档

var filter = Builders<Person>.Filter.Where(x => x.Id == id);
var update = Builders<Person>.Update.PullFilter<Attr>(x => x.Attribute, y => y.Id.Equals(""));
var result = this.personRepository.Collection.UpdateOne(filter, update);

或者

var filter = Builders<Person>.Filter.Where(x => x.Id == id);
var update = Builders<Person>.Update.PullFilter(x => x.Attribute, y => y.Id.Equals(""));
var result = this.personRepository.Collection.UpdateOne(filter, update);

或者

var filter = Builders<Person>.Filter.Where(x => x.Id == id);
var update = Builders<Person>.Update.PullFilter("Attribute", Builders<Attr>.Filter.Eq("_id",6));
var result = this.personRepository.Collection.UpdateOne(filter, update);

3. 更新FirstName的值

var filter = Builders<Person>.Filter.Where(x => x.Id == id);
var update = Builders<Person>.Update.Set(x => x.FirstName, "22222");
var result = this.personRepository.Collection.UpdateOne(filter, update);

4. 往Attribute里添加一条记录

var filter = Builders<Person>.Filter.Where(x => x.Id == id);
var update = Builders<Person>.Update.Push<Attr>(x => x.Attribute, new Attr() { Id = "7", Name = "7" });
var result = this.personRepository.Collection.UpdateOne(filter, update);