单个MongoDB实例上的C#MongoDB驱动程序事务
我正在使用MongoDB 4.0.8和C#driver 2.8.1,并试图在我的项目中实现单个MongoDB实例上的C#MongoDB驱动程序事务,c#,mongodb,C#,Mongodb,我正在使用MongoDB 4.0.8和C#driver 2.8.1,并试图在我的项目中实现事务。 我复制粘贴了以下代码示例: static async Task<bool> UpdateProducts() { //Create client connection to our MongoDB database var client = new MongoClient(MongoDBConnectionString); //Create a session
事务。
我复制粘贴了以下代码示例:
static async Task<bool> UpdateProducts()
{
//Create client connection to our MongoDB database
var client = new MongoClient(MongoDBConnectionString);
//Create a session object that is used when leveraging transactions
var session = client.StartSession();
//Create the collection object that represents the "products" collection
var products = session.Client.GetDatabase("MongoDBStore").GetCollection<Product>("products");
//Clean up the collection if there is data in there
products.Database.DropCollection("products");
//Create some sample data
var TV = new Product { Description = "Television", SKU = 4001, Price = 2000 };
var Book = new Product { Description = "A funny book", SKU = 43221, Price = 19.99 };
var DogBowl = new Product { Description = "Bowl for Fido", SKU = 123, Price = 40.00 };
//Begin transaction
session.StartTransaction(new TransactionOptions(
readConcern: ReadConcern.Snapshot,
writeConcern: WriteConcern.WMajority));
try
{
//Insert the sample data
await products.InsertOneAsync(session, TV);
await products.InsertOneAsync(session, Book);
await products.InsertOneAsync(session, DogBowl);
var filter = new FilterDefinitionBuilder<Product>().Empty;
var results = await products.Find(filter).ToListAsync();
//Increase all the prices by 10% for all products
var update = new UpdateDefinitionBuilder<Product>().Mul<Double>(r => r.Price, 1.1);
await products.UpdateManyAsync(session, filter, update); //,options);
//Made it here without error? Let's commit the transaction
session.CommitTransaction();
//Let's print the new results to the console
Console.WriteLine("Original Prices:\n");
results = await products.Find<Product>(filter).ToListAsync();
foreach (Product d in results)
{
Console.WriteLine(String.Format("Product Name: {0}\tPrice: {1:0.00}", d.Description, d.Price));
}
}
catch (Exception e)
{
Console.WriteLine("Error writing to MongoDB: " + e.Message);
session.AbortTransaction();
}
return true;
}
报告说:
从版本4.0开始,MongoDB提供了对副本集执行多文档事务的能力
我的项目中没有副本,我只有一个数据库实例,它是我的主要数据库实例。是否有一个解决方案或变通方法可用于实施事务
?我有一些方法可以更新多个集合,我真的认为这可以节省我使用它的时间。正如文档所述,事务只适用于副本集。因此,您需要将mongodb服务器作为单节点副本集运行。要实现这一点,请执行以下步骤
第1步:
停止mongodb服务器
第二步:
将replication
设置添加到您的mongod.cfg文件中。这是我自己的例子
storage:
dbPath: C:\DATA
directoryPerDB: true
journal:
enabled: true
systemLog:
destination: file
logAppend: true
path: C:\DATA\log\mongod.log
net:
port: 27017
bindIp: 127.0.0.1
replication:
replSetName: MyRepSet
步骤3:打开mongodb shell并发出以下命令以启动副本集
rs.initiate()
步骤4:重新启动mongod
另外,如果您想编写更干净、更方便的事务代码,请查看我的库
使用(var TN=new Transaction())
{
var author=新作者{Name=“one”};
TN.Save(作者);
TN.Delete(book.ID);
TN.Commit();
}
请参见注释2:出于开发目的,您可以使用一个节点启动副本集。启动mongod-replSet,然后在mongoshell中执行rs.initiate()。请注意,这不是生产环境的推荐设置。@LiranFriedman我假设您使用的是mongod.cfg
文件。本质上是一样的。
storage:
dbPath: C:\DATA
directoryPerDB: true
journal:
enabled: true
systemLog:
destination: file
logAppend: true
path: C:\DATA\log\mongod.log
net:
port: 27017
bindIp: 127.0.0.1
replication:
replSetName: MyRepSet