C# Asp.net中简单操作MongoDB数据库（一）

需要引用MongoDB.Driver.dll、MongoDB.Driver.core.dll、MongoDB.Bson.dll三个dll。

1、数据库连接：

public class MongoDb
    {
        //方式一
        //private static readonly string connStr = "mongodb://myAdmin:123456@localhost";
        //private static readonly string dbName = "myTest";

        //方式二（myTestAdmin用户只可访问数据库myTest）
        private static readonly string connStr = "mongodb://myTestAdmin:123456@localhost/myTest";

        private static IMongoDatabase db = null;

        private static readonly object lockHelper = new object();

        private MongoDb() { }

        public static IMongoDatabase GetMongoDb()
        {
            if (db == null)
            {
                lock (lockHelper)
                {
                    if (db == null)
                    {
                        //方式一
                        //var client = new MongoClient(connStr);
                        //db = client.GetDatabase(dbName);

                        //方式二（myTestAdmin用户只可访问数据库myTest）
                        var url = new MongoUrl(connStr);
                        MongoClientSettings mcs = MongoClientSettings.FromUrl(url);
                        mcs.MaxConnectionLifeTime = TimeSpan.FromMilliseconds(1000);
                        var client = new MongoClient(mcs);
                        db = client.GetDatabase(url.DatabaseName);
                    }
                }
            }
            return db;
        }
    }

2、插入操作：

class Program
    {
        static void Main(string[] args)
        {
            IMongoDatabase db = MongoDb.GetMongoDb();

            var collection = db.GetCollection<BsonDocument>("userInfo");            

            //插入
            var document = new BsonDocument
            {
                { "name", "Liming" },
                { "age", "23" },
                { "score", new BsonDocument
                    {
                        { "yuwen", 115 },
                        { "shuxue", 135 },
                        { "yingyu", 120 }
                    }}
            };
            collection.InsertOne(document);            

            Console.ReadKey();
        }
    }

Robomongo中查看结果：

3、查询操作：

class Program
    {
        static void Main(string[] args)
        {
            IMongoDatabase db = MongoDb.GetMongoDb();

            var collection = db.GetCollection<BsonDocument>("userInfo");            
            
            //查询            
            var document = collection.Find(new BsonDocument()).FirstOrDefault();
            Console.WriteLine(document.ToString());
            

            Console.ReadKey();
        }
    }

4、更新操作：

class Program
    {
        static void Main(string[] args)
        {
            IMongoDatabase db = MongoDb.GetMongoDb();

            var collection = db.GetCollection<BsonDocument>("userInfo");            
            
            //更新
            var filter = Builders<BsonDocument>.Filter.Eq("age", "23");
            var update = Builders<BsonDocument>.Update.Set("age", "30");
            collection.UpdateOne(filter, update);
            
            Console.ReadKey();
        }
    }

5、删除操作：

 class Program
    {
        static void Main(string[] args)
        {
            IMongoDatabase db = MongoDb.GetMongoDb();

            var collection = db.GetCollection<BsonDocument>("userInfo");            
            
            //删除
            var filter1 = Builders<BsonDocument>.Filter.Eq("age", "30");
            collection.DeleteOne(filter1);

            Console.ReadKey();
        }
    }

参考：http://mongodb.github.io/mongo-csharp-driver/2.5/getting_started/quick_tour/

上面操作的集合类型都是BsonDocument，

下面可以自定义实体类，mongodb可以直接返回对应自定义类的集合或者对象：

C# Asp.net中简单操作MongoDB数据库（二）