MongoDB入门好代码教程之C#驱动操作实例

作为系列的最后一篇，得要说说C#驱动对mongodb的操作，目前驱动有两种：官方驱动和samus驱动，不过我个人还是喜欢后者，

因为提供了丰富的linq操作，相当方便。

官方驱动：https://github.com/mongodb/mongo-csharp-driver/downloads。下载后，还提供了一个酷似msdn的帮助文档。

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

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

一个简单的demo，大体上看看我们就知道怎么玩了。

一： 实践

1：我们建立一个Person实体，MongoAlias特性表示取别名，这里的ID值将会覆盖掉数据库自动生成的_id。

#region 数据实体

 /// <summary>

/// 数据实体

/// </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：初始化一些变量

string connectionString = string.Empty;

 string databaseName = string.Empty;
 string collectionName = string.Empty;
 static MongodbHelper<T> 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：为了方便T的继承类使用linq功能，我们还需要映射一下。

#region 实现linq查询的映射配置

 /// <summary>

/// 实现linq查询的映射配置

/// </summary>

 public MongoConfiguration configuration

 {

 get

 {

 var config = new MongoConfigurationBuilder();

 config.Mapping(mapping =>

 {

 mapping.DefaultProfile(profile =>

 {

 profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));

 });

 mapping.Map<T>();

 mapping.Map<T>();

 });
 config.ConnectionString(connectionString);
 return config.BuildConfiguration();

 }

 }

 #endregion

4：下面是一些基本的CURD的代码，跟写EF代码很类似，写起来好舒服。

#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.GetCollection<T>(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, Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 collection.Update<T>(t, func, true);
 mongo.Disconnect();
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion
 #region 获取集合

 /// <summary>

///获取集合

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)

 {

 pageCount = 0;
 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(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 读取单条记录

 /// <summary>

///读取单条记录

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public T Single(Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 var single = collection.Linq().FirstOrDefault(func);
 mongo.Disconnect();
 return single;
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion
 #region 删除操作

 /// <summary>

/// 删除操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public void Delete(Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 //这个地方要注意，一定要加上T参数，否则会当作object类型处理

//导致删除失败

 collection.Remove<T>(func);
 mongo.Disconnect();
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion

5. 好，我们开一下2222端口，由于前前篇我已经把这个mongodb做成了服务，现在就直接连过去了，并做一下对Name的索引。

6. 一切准备妥当，我们做下基本的操作，比如这里我添加一千条数据，注意我开启的是安全模式，如果插入不成功，将会抛出异常。

<1> Add:

static void Main(string[] args)

 {

 MongodbHelper<Person> helper = new MongodbHelper<Person>();

 //插入1000条数据

 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();

 }

乍一看显示的数据以为有问题，为什么没有出现jack0或者jack999，不过find的一下后心情舒坦了。

<2> update: 这里就把jack941的名字改掉“mary”

static void Main(string[] args)

 {

 MongodbHelper<Person> helper = new MongodbHelper<Person>();

 //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： 删除mary这条记录

static void Main(string[] args)

 {

 MongodbHelper<Person> helper = new MongodbHelper<Person>();

 //删除mary这个记录

 helper.Delete(i => i.Name == "mary");
 Console.WriteLine("删除成功");

 Console.Read();

 }

<4> list操作： 这里我获取一下名字里面带9的人数列表

static void Main(string[] args)

 {

 MongodbHelper<Person> helper = new MongodbHelper<Person>();

 int pagecount;
 //获取名字里面带9的人数

 var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);
 Console.Read();

 }

总的运行代码

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 MongodbHelper<T> where T : class

 {

 string connectionString = string.Empty;
 string databaseName = string.Empty;
 string collectionName = string.Empty;
 static MongodbHelper<T> 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
 #region 实现linq查询的映射配置

 /// <summary>

/// 实现linq查询的映射配置

/// </summary>

 public MongoConfiguration configuration

 {

 get

 {

 var config = new MongoConfigurationBuilder();
 config.Mapping(mapping =>

 {

 mapping.DefaultProfile(profile =>

 {

 profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));

 });

 mapping.Map<T>();

 mapping.Map<T>();

 });
 config.ConnectionString(connectionString);
 return config.BuildConfiguration();

 }

 }

 #endregion
 #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.GetCollection<T>(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, Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 collection.Update<T>(t, func, true);
 mongo.Disconnect();
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion
 #region 获取集合

 /// <summary>

///获取集合

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)

 {

 pageCount = 0;
 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(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 读取单条记录

 /// <summary>

///读取单条记录

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public T Single(Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 var single = collection.Linq().FirstOrDefault(func);
 mongo.Disconnect();
 return single;
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion
 #region 删除操作

 /// <summary>

/// 删除操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

 public void Delete(Expression<Func<T, bool>> func)

 {

 using (Mongo mongo = new Mongo(configuration))

 {

 try

 {

 mongo.Connect();
 var db = mongo.GetDatabase(databaseName);
 var collection = db.GetCollection<T>(collectionName);
 //这个地方要注意，一定要加上T参数，否则会当作object类型处理

//导致删除失败

 collection.Remove<T>(func);
 mongo.Disconnect();
 }

 catch (Exception)

 {

 mongo.Disconnect();

 throw;

 }

 }

 }

 #endregion

 }
 #region 数据实体

 /// <summary>

/// 数据实体

/// </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

}

以上就是MongoDB入门好代码教程之C#驱动操作实例。也许一个人，要走很多的路，经历过生命中无数突如其来的繁华和苍凉，才会变成熟。更多关于MongoDB入门好代码教程之C#驱动操作实例请关注haodaima.com其它相关文章！