【转载】8天学通MongoDB——第八天驱动实践

2023-01-02 11:33:10

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 = ;

             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 - ))
                                                    .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 = ; i < ; 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(, , i => i.Name.Contains(""), 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 = ;

             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 - ))
                                                    .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
 }

原文地址：http://www.cnblogs.com/huangxincheng/archive/2012/03/09/2386054.html

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