技术开发 频道

八天学会MongoDB:第八天 驱动实践

        【IT168 技术】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。

  相关文章:

  八天学会MongoDB:第一天 基础入门

  八天学会MongoDB:第二天 细说增删查改

  八天学会MongoDB:第三天 细说高级操作

  八天学会MongoDB:第四天 索引操作

  八天学会MongoDB:第五天 主从复制

  八天学会MongoDB:第六天 分片技术

  八天学会MongoDB:第七天 运维技术

  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
${PageNumber}

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
${PageNumber}

  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 helper
= new MongodbHelper();

  
//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 helper = new MongodbHelper();

  //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 helper
= new MongodbHelper();

  
//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 helper
= new MongodbHelper();

  
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();

  }

${PageNumber}

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
}
0
相关文章