Question

以下代码将允许我更新FirstName =“john”和LastName =“Doe”的电子邮件。如何在不使用Save（）方法的情况下更新电子邮件和电话？

MongoDB.Driver.MongoServer _server = MongoDB.Driver.MongoServer.Create("mongodb://localhost");
MongoDB.Driver.MongoDatabase _dataBase = _server.GetDatabase("test");
MongoDB.Driver.MongoCollection<Person> _person = _dataBase.GetCollection<Person>("person");

//Creat new person and insert it into collection
ObjectId newId  = ObjectId.GenerateNewId();
Person newPerson = new Person();
newPerson.Id = newId.ToString();
newPerson.FirstName = "John";
newPerson.LastName = "Doe";
newPerson.Email = "john.doe@gmail.com";
newPerson.Phone = "8005551222";
_person.Insert(newPerson);

//Update phone and email for all record with firstname john and lastname doe
MongoDB.Driver.Builders.QueryComplete myQuery = MongoDB.Driver.Builders.Query.And(MongoDB.Driver.Builders.Query.EQ("FirstName", "John"),    MongoDB.Driver.Builders.Query.EQ("LastName", "Doe"));
MongoDB.Driver.Builders.UpdateBuilder update = MongoDB.Driver.Builders.Update.Set("Email", "jdoe@gmail.com");

_person.Update(myQuery, update);

Answer 1

这很简单;），只需在您的更新中添加另一组或其他操作：

 var update = Update.Set("Email", "jdoe@gmail.com")
                    .Set("Phone", "4455512");

Answer 2

您还可以使用通用和类型安全的Update<TDocument>：

var update = Update<Person>.
    Set(p => p.Email, "jdoe@gmail.com").
    Set(p => p.Phone, "4455512");

Answer 3

我想更新N个字段，这是我如何实现的

我使用了Builders<T>.Update.Combine

// Get the id for which data should be updated
var filter = Builders<BsonDocument>.Filter.Eq("_id", ObjectId.Parse(_id));

// Add Data which we wants to update to the List
var updateDefination = new List<UpdateDefinition<BsonDocument>>();
foreach (var dataField in metaData.Fields)
{
    updateDefination.Add(Builders<BsonDocument>.Update.Set(dataField.Name, dataField.Value));
}
var combinedUpdate = Builders<BsonDocument>.Update.Combine(updateDefination);
await GetCollectionForClient().UpdateOneAsync(filter, combinedUpdate);

Answer 4

var _personobj = _person
{
    Id = 10, // Object ID
    Email="jdoe@gmail.com",
    Phone=123456,

};
var replacement = Update<_person>.Replace(_personobj);
collection.Update(myquery, replacement);

Answer 5

对于条件更新，您可以使用类似

return ' '.join([s for s in procLine.split(' ') if len(s) > 2])

或者只是弹出记录，然后修改并替换它。

Answer 6

如果您想再一次更新文档字段，请选择多标记。

例如mongodb 2.0或3.0v：

yourCollection.Update(_filter
                      , _update
                      , new MongoUpdateOptions() { Flags = UpdateFlags.Multi })

如何使用官方c＃驱动程序在MongoDB中使用Update.Set更新多个字段？

6 个答案: