MongoDB入门教程之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。
复制代码 代码如下:
#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

复制代码 代码如下:
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。

复制代码 代码如下:
#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。

复制代码 代码如下:
#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.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:

复制代码 代码如下:
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”

复制代码 代码如下:
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

复制代码 代码如下:
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

复制代码 代码如下:
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

复制代码 代码如下:
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 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
}