MongoDB入门教程之C#驱动操作实例(2)-木庄网络博客

当前第2页返回上一页

            //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

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

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

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
}

标签：MongoDB

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