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[英]How to update multiple changes to doc with embedded docs in MongoDB using official C# driver
[英]How do you update multiple field using Update.Set in MongoDB using official c# driver?
下面的代码将允许我更新 Email,其中 FirstName =“john”和 LastName =“Doe”。 如何在不使用 Save() 方法的情况下同时更新 Email 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);
这很简单;),只需在更新中添加另一个集合或其他操作:
var update = Update.Set("Email", "jdoe@gmail.com")
.Set("Phone", "4455512");
您还可以使用泛型和类型安全的Update<TDocument>
:
var update = Update<Person>.
Set(p => p.Email, "jdoe@gmail.com").
Set(p => p.Phone, "4455512");
对于有条件更新,您可以使用类似
var updList = new List<UpdateDefinition<MongoLogEntry>>();
var collection = db.GetCollection<MongoLogEntry>(HistoryLogCollectionName);
var upd = Builders<MongoLogEntry>.Update.Set(r => r.Status, status)
.Set(r => r.DateModified, DateTime.Now);
updList.Add(upd);
if (errorDescription != null)
updList.Add(Builders<MongoLogEntry>.Update.Set(r => r.ErrorDescription, errorDescription));
var finalUpd = Builders<MongoLogEntry>.Update.Combine(updList);
collection.UpdateOne(r => r.CadNum == cadNum, finalUpd, new UpdateOptions { IsUpsert = true });
或者只是弹出记录,然后修改和替换它。
我想更新多个 N 字段,这是我实现它的方式
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);
var _personobj = _person
{
Id = 10, // Object ID
Email="jdoe@gmail.com",
Phone=123456,
};
var replacement = Update<_person>.Replace(_personobj);
collection.Update(myquery, replacement);
如果您想再更新一个文档的字段,请选择多标志。
例如 mongodb 2.0 或 3.0v:
yourCollection.Update(_filter
, _update
, new MongoUpdateOptions() { Flags = UpdateFlags.Multi })
我们可以将变量作为元组传递。
public async Task Update(string id, params (Expression<Func<TEntity, dynamic>> field, dynamic value)[] list)
{
var builder = Builders<TEntity>.Filter;
var filter = builder.Eq("_id", id);
var updateBuilder = Builders<TEntity>.Update;
var updates = new List<UpdateDefinition<TEntity>>();
foreach (var item in list)
updates.Add(updateBuilder.Set(item.field, item.value));
var result = await _dbCollection.UpdateOneAsync(filter, updateBuilder.Combine(updates));
}
用法:
await _userRepository.Update(user.id, (x => x.bio, "test"), (x => x.isEmailVerified, false));
您需要单独设置每个属性。 因此,对于具有多个字段的对象,此扩展很方便:
public static UpdateDefinition<T> ApplyMultiFields<T>(this UpdateDefinitionBuilder<T> builder, T obj)
{
var properties = obj.GetType().GetProperties();
UpdateDefinition<T> definition = null;
foreach (var property in properties)
{
if (definition == null)
{
definition = builder.Set(property.Name, property.GetValue(obj));
}
else
{
definition = definition.Set(property.Name, property.GetValue(obj));
}
}
return definition;
}
并像这样被调用:
public async Task<bool> Update(StaffAccount model)
{
var filter = Builders<StaffAccount>.Filter.Eq(d => d.Email, model.Email);
// var update = Builders<StaffAccount>.Update.Set(d => d, model); // this doesnt work
var update = Builders<StaffAccount>.Update.ApplyMultiFields(model);
var result = await this.GetCollection().UpdateOneAsync(filter, update);
return result.ModifiedCount > 0;
}
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