初学MongoDB之C#驱动
初学MongoDB的过程中,很多都是新的知识,只有深入了解后才知道它们怎么运用,下面小编就来给大家说说C#驱动中操作MongoDB数据的方法和代码示例,给有需要的朋友可以参考下。
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。
官方驱动下载后,还提供了一个酷似msdn的帮助文档。
下面就具体看看samus驱动,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
///
/// 数据实体
///
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
#region 初始化操作
///
/// 初始化操作
///
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
///
/// 实现linq查询的映射配置
///
public MongoConfiguration configuration
{
get
{
var config = new MongoConfigurationBuilder();
config.Mapping(mapping =>
{
mapping.DefaultProfile(profile =>
{
profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));
});
mapping.Map
mapping.Map
});
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
///
/// 插入操作
///
///
///
public void Insert(T t)
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
collection.Insert(t, true);
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 更新操作
///
/// 更新操作
///
///
///
public void Update(T t, Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
collection.Update
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 获取集合
///
///获取集合
///
///
///
public List
{
pageCount = 0;
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
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
///
///读取单条记录
///
///
///
public T Single(Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
var single = collection.Linq().FirstOrDefault(func);
mongo.Disconnect();
return single;
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 删除操作
///
/// 删除操作
///
///
///
public void Delete(Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
//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
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。
Add:
static void Main(string[] args)
{
MongodbHelper
//插入1000条数据
for (int i = 0; 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。
update: 这里就把jack941的名字改掉“mary”
static void Main(string[] args)
{
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();
}
Delete: 删除mary这条记录
static void Main(string[] args)
{
MongodbHelper
//删除mary这个记录
helper.Delete(i => i.Name == "mary");
Console.WriteLine("删除成功");
Console.Read();
}
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
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
{
string connectionString = string.Empty;
string databaseName = string.Empty;
string collectionName = string.Empty;
static MongodbHelper
#region 初始化操作
///
/// 初始化操作
///
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
///
/// 实现linq查询的映射配置
///
public MongoConfiguration configuration
{
get
{
var config = new MongoConfigurationBuilder();
config.Mapping(mapping =>
{
mapping.DefaultProfile(profile =>
{
profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));
});
mapping.Map
mapping.Map
});
config.ConnectionString(connectionString);
return config.BuildConfiguration();
}
}
#endregion
#region 插入操作
///
/// 插入操作
///
///
///
public void Insert(T t)
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
collection.Insert(t, true);
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 更新操作
///
/// 更新操作
///
///
///
public void Update(T t, Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
collection.Update
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 获取集合
///
///获取集合
///
///
///
public List
{
pageCount = 0;
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
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
///
///读取单条记录
///
///
///
public T Single(Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
var single = collection.Linq().FirstOrDefault(func);
mongo.Disconnect();
return single;
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 删除操作
///
/// 删除操作
///
///
///
public void Delete(Expression
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection
//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
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
}
#region 数据实体
///
/// 数据实体
///
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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