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MongoDB入門教程之C#驅動操作實例

作為系列的最后一篇，得要說說C#驅動對mongodb的操作，目前驅動有兩種：官方驅動和samus驅動，不過我個人還是喜歡后者，

因為提供了豐富的linq操作，相當方便。

官方驅動：https://github.com/mongodb/mongo-csharp-driver/downloads。下載后，還提供了一個酷似msdn的幫助文檔。

samus驅動：https://github.com/samus/mongodb-csharp/downloads。

下面就具體看看samus驅動，https://github.com/samus/mongodb-csharp/blob/master/examples/Simple/Main.cs上面提供了

一個簡單的demo，大體上看看我們就知道怎么玩了。

一：實踐

1：我們建立一個Person實體，MongoAlias特性表示取別名，這里的ID值將會覆蓋掉數據庫自動生成的_id。

復制代碼代碼如下:

#region 數據實體
    /// summary>
/// 數據實體
/// /summary>
    public class Person
    {
        [MongoAlias("_id")]
        public string ID { get; set; }

public string Name { get; set; }

public int Age { get; set; }

        public DateTime CreateTime { get; set; }
    }
    #endregion

2：初始化一些變量

復制代碼代碼如下:

string connectionString = string.Empty;

string databaseName = string.Empty;

string collectionName = string.Empty;

static MongodbHelperT> mongodb;

        #region 初始化操作
/// summary>
/// 初始化操作
/// /summary>
        public MongodbHelper()
        {
            connectionString = "Server=127.0.0.1:2222";
            databaseName = "shopex";
            collectionName = "person";
        }
        #endregion

3：為了方便T的繼承類使用linq功能，我們還需要映射一下。

復制代碼代碼如下:

#region 實現linq查詢的映射配置
        /// summary>
/// 實現linq查詢的映射配置
/// /summary>
        public MongoConfiguration configuration
        {
            get
            {
                var config = new MongoConfigurationBuilder();

                config.Mapping(mapping =>
                {
                    mapping.DefaultProfile(profile =>
                    {
                        profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));
                    });
                    mapping.MapT>();
                    mapping.MapT>();
                });

config.ConnectionString(connectionString);

                return config.BuildConfiguration();
            }
        }
        #endregion

4：下面是一些基本的CURD的代碼，跟寫EF代碼很類似，寫起來好舒服。

復制代碼代碼如下:

#region 插入操作
        /// summary>
/// 插入操作
/// /summary>
/// param name="person">/param>
/// returns>/returns>
        public void Insert(T t)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

collection.Insert(t, true);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

        #region 更新操作
        /// summary>
/// 更新操作
/// /summary>
/// param name="person">/param>
/// returns>/returns>
        public void Update(T t, ExpressionFuncT, bool>> func)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

collection.UpdateT>(t, func, true);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

        #region 獲取集合
        /// summary>
///獲取集合
/// /summary>
/// param name="person">/param>
/// returns>/returns>
        public ListT> List(int pageIndex, int pageSize, ExpressionFuncT, bool>> func, out int pageCount)
        {
            pageCount = 0;

            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

pageCount = Convert.ToInt32(collection.Count());

var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))
.Take(pageSize).Select(i => i).ToList();

mongo.Disconnect();

return personList;

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

        #region 讀取單條記錄
        /// summary>
///讀取單條記錄
/// /summary>
/// param name="person">/param>
/// returns>/returns>
        public T Single(ExpressionFuncT, bool>> func)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

var single = collection.Linq().FirstOrDefault(func);

mongo.Disconnect();

return single;

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

        #region 刪除操作
        /// summary>
/// 刪除操作
/// /summary>
/// param name="person">/param>
/// returns>/returns>
        public void Delete(ExpressionFuncT, bool>> func)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

//這個地方要注意，一定要加上T參數，否則會當作object類型處理
//導致刪除失敗
collection.RemoveT>(func);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

5. 好，我們開一下2222端口，由于前前篇我已經把這個mongodb做成了服務，現在就直接連過去了，并做一下對Name的索引。

6. 一切準備妥當，我們做下基本的操作，比如這里我添加一千條數據，注意我開啟的是安全模式，如果插入不成功，將會拋出異常。

1> Add:

復制代碼代碼如下:

static void Main(string[] args)
{
MongodbHelperPerson> helper = new MongodbHelperPerson>();

            //插入1000條數據
            for (int i = 0; i 1000; i++)
            {
                helper.Insert(new Person()
                {
                    ID = Guid.NewGuid().ToString(),
                    Name = "jack" + i,
                    Age = i,
                    CreateTime = DateTime.Now
                });
            }

Console.WriteLine("插入成功");

Console.Read();
}

乍一看顯示的數據以為有問題，為什么沒有出現jack0或者jack999，不過find的一下后心情舒坦了。

2> update: 這里就把jack941的名字改掉“mary”

復制代碼代碼如下:

static void Main(string[] args)
{
MongodbHelperPerson> helper = new MongodbHelperPerson>();

            //修改jack941改成mary
            var single = helper.Single(i => i.Name == "jack941");
            single.Name = "mary";
            helper.Update(single, i => i.ID == single.ID);

            Console.WriteLine("修改成功");
            Console.Read();
        }

3>Delete：刪除mary這條記錄

復制代碼代碼如下:

static void Main(string[] args)
{
MongodbHelperPerson> helper = new MongodbHelperPerson>();

//刪除mary這個記錄
helper.Delete(i => i.Name == "mary");

            Console.WriteLine("刪除成功");
            Console.Read();
        }

4> list操作：這里我獲取一下名字里面帶9的人數列表

復制代碼代碼如下:

static void Main(string[] args)
{
MongodbHelperPerson> helper = new MongodbHelperPerson>();

int pagecount;

//獲取名字里面帶9的人數
var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);

Console.Read();
}

總的運行代碼

復制代碼代碼如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Linq.Expressions;

using MongoDB.Configuration;
using MongoDB.Linq;
using MongoDB.Attributes;

namespace MongoDB.Test
{
    public class MongodbHelperT> where T : class
    {
        string connectionString = string.Empty;

string databaseName = string.Empty;

string collectionName = string.Empty;

static MongodbHelperT> mongodb;

        #region 初始化操作
        /// summary>
/// 初始化操作
/// /summary>
        public MongodbHelper()
        {
            connectionString = "Server=127.0.0.1:2222";
            databaseName = "shopex";
            collectionName = "person";
        }
        #endregion

config.ConnectionString(connectionString);

                return config.BuildConfiguration();
            }
        }
        #endregion

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

collection.Insert(t, true);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

collection.UpdateT>(t, func, true);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

pageCount = Convert.ToInt32(collection.Count());

var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))
.Take(pageSize).Select(i => i).ToList();

mongo.Disconnect();

return personList;

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

var single = collection.Linq().FirstOrDefault(func);

mongo.Disconnect();

return single;

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollectionT>(collectionName);

//這個地方要注意，一定要加上T參數，否則會當作object類型處理
//導致刪除失敗
collection.RemoveT>(func);

mongo.Disconnect();

                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion
    }

    #region 數據實體
    /// summary>
/// 數據實體
/// /summary>
    public class Person
    {
        [MongoAlias("_id")]
        public string ID { get; set; }

public string Name { get; set; }

public int Age { get; set; }

        public DateTime CreateTime { get; set; }
    }
    #endregion
}

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