MongoDB 学习笔记（四）C# 操作MongoDB
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。
封装的 MongoDBHepler
public class MongoDBHepler<T> where T:class
{
//数据库连接字符串区分大小写
public static string connectionString =ConfigurationManager.AppSettings["mongodbconn"].ToString();
public static string databaseName = ConfigurationManager.AppSettings["mongodbName"].ToString();
#region 初始化操作
/// <summary>
///
/// </summary>
/// <param name="strdatabaseName"></param>
/// <param name="strcollectionName"></param>
public MongoDBHepler()
{
}
#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>
/// <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>();
collection.Insert(t, true);
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
public void Insert(List<T> list)
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection<T>();
collection.Insert(list, true);
mongo.Disconnect();
}
catch (Exception)
{
mongo.Disconnect();
throw;
}
}
}
#endregion
#region 更新操作
/// <summary>
/// 更新操作
/// </summary>
/// <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>();
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>
/// <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>();
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;
}
}
}
public List<T> List(Expression<Func<T, bool>> func)
{
using (Mongo mongo = new Mongo(configuration))
{
try
{
mongo.Connect();
var db = mongo.GetDatabase(databaseName);
var collection = db.GetCollection<T>();
var personList = collection.Linq().Where(func).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>
/// <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>();
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>
/// <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>();
//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
}
使用：
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。
1 #region 数据实体
2 /// <summary>
3 /// 数据实体
4 /// </summary>
5 public class Person
6 {
7 [MongoAlias("_id")]
8 public string ID { get; set; }
9
10 public string Name { get; set; }
11
12 public int Age { get; set; }
13
14 public DateTime CreateTime { get; set; }
15 }
16 #endregion
<1> Add:
1 static void Main(string[] args)
2 {
3 MongodbHelper<Person> helper = new MongodbHelper<Person>();
4
5 //插入1000条数据
6 for (int i = 0; i < 1000; i++)
7 {
8 helper.Insert(new Person()
9 {
10 ID = Guid.NewGuid().ToString(),
11 Name = "jack" + i,
12 Age = i,
13 CreateTime = DateTime.Now
14 });
15 }
16
17 Console.WriteLine("插入成功");
18
19 Console.Read();
20 }
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”
1 static void Main(string[] args)
2 {
3 MongodbHelper<Person> helper = new MongodbHelper<Person>();
4
5 //修改jack941改成mary
6 var single = helper.Single(i => i.Name == "jack941");
7 single.Name = "mary";
8 helper.Update(single, i => i.ID == single.ID);
9
10 Console.WriteLine("修改成功");
11 Console.Read();
12 }
<3>Delete： 删除mary这条记录
1 static void Main(string[] args)
2 {
3 MongodbHelper<Person> helper = new MongodbHelper<Person>();
4
5 //删除mary这个记录
6 helper.Delete(i => i.Name == "mary");
7
8 Console.WriteLine("删除成功");
9 Console.Read();
10 }
<4> list操作： 这里我获取一下名字里面带9的人数列表
1 static void Main(string[] args)
2 {
3 MongodbHelper<Person> helper = new MongodbHelper<Person>();
4
5 int pagecount;
6
7 //获取名字里面带9的人数
8 var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);
9
10 Console.Read();
11 }
