Question

在MongoDB中，c＃driver（2.0+）可以在执行和updateManyAsync时进行upsert吗？ This示例有助于UpdateOne，但我正在寻找适用于updateMany的内容。

Answer 1

使用updateMany时，

Upsert工作正常：

var options = new UpdateOptions { IsUpsert = true };
var result = await collection.UpdateManyAsync(filter, update, options);

Answer 2

UpdateDefinition<Phone> updateDefinition = Builders<Phone>.Update.Set(x => x.Name, "Updated Name");
MongoDb.GetCollection<Phone>("Phone").UpdateOne(x => x._id == "foo", updateDefinition); // replaces first match
MongoDb.GetCollection<Phone>("Phone").UpdateMany(x => x.SomeProp == 5, updateDefinition); // replaces all matches

假设您有一堂课：

class Phone
{
    public string _id {get; set;} // this is the primary key because Mongo uses _id as primary key
    public string Name {get;set;}
    public int SomeProp {get;set;}

    // etc...
 }

Answer 3

这是在C＃.Net核心中使用UpdateMany的更完整的示例：

BostadsUppgifterMongoDbContext context = new BostadsUppgifterMongoDbContext(_configuration.GetConnectionString("DefaultConnection"), _configuration["ConnectionStrings:DefaultConnectionName"]);
var residenceCollection = context.MongoDatabase.GetCollection<Residence>("Residences");
residenceCollection.UpdateMany(x =>
    x.City == "Stockholm",
    Builders<Residence>.Update.Set(p => p.Municipality, "Stoholms län"),
    new UpdateOptions { IsUpsert = false }
);

如果IsUpsert设置为true，则会在找不到匹配项的情况下插入文档。

Answer 4

TModel是您的模型

var updateBuilder = new UpdateDefinitionBuilder<TModel>();
yourContext.UpdateMany(filterExpression, update.Set(updateExpression, updateValue));

使用updateMany的upsert的MongoDB c＃驱动程序

4 个答案: