windows7下MongoDB(V3.4)的使用及倉儲設計
簡單的介紹一下,我使用MongoDB的場景。
我們現在的物聯網環境下,有部分數據,采樣頻率為2000條記錄/分鐘,這樣下來一天24*60*2000=2880000約等於300萬條數據,以後必然還會增加。之前數據庫使用的是mssql,對於數據庫的壓力很大,同時又需要保證歷史查詢的響應速度,這種情況下,在單表中數據量大,同時存在讀寫操作。不得已采用MongoDB來存儲數據。如果使用MongoDB,則至少需要三臺機器,兩臺實現讀寫分離,一臺作為仲裁(當然條件不允許也可以不用),每臺機器的內存暫時配置在16G,公司小,沒辦法,據說,使用這個MongoDB需要機器內存最少92G,我沒有驗證過,但是吃內存是公認的,所以內存絕對要保證,就算保證了,也不一定完全就沒有意外發生。我們上面的這些特殊的數據是允許少量的丟失的,這些只是做分析使用的,幾個月了,暫時還沒出現數據丟失的情況,可能最新版本早就修復了吧,新手使用建議多看下官網上的說明。下面直接奔入主題:
using System;
using System.Text;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;
using ProtoBuf;
namespace UnitoonIot.Mongo
{
/// <summary>
/// 實體基類,方便生成ObjId
/// </summary>
[Serializable]
[ProtoContract(ImplicitFields = ImplicitFields.AllPublic)]
//[ProtoInclude(10, typeof(NormalHistory))]
{
//[BsonRepresentation(BsonType.ObjectId)]
public ObjectId Id { get; set; }
/// <summary>
/// 數據庫名稱
/// </summary>
public string DbName { get; set; }
/// <summary>
/// 給對象初值
/// </summary>
public BaseEntity()
{
// this.ObjId = ObjectId.GenerateNewId().ToString();
//this.Id = ObjectId.NewObjectId().ToString();
}
}
}
這裏需要註意時間格式,MongoDB默認時間格式為國際時間,所以在寫入數據時和讀取數據時,時間格式要一致,此例中沒有對時間進行特殊處理,由傳入的時間格式確定。
2.Repository繼承接口IMongoRepository
namespace UnitoonIot.Mongo
{
public interface IMongoRepository<TEntity> where TEntity : class
{
}
}
3.MongoRepository
namespace UnitoonIot.Mongo
{
public class MongoDb
{
private static string ConnectionStringHost ;
private static string UserName ;
private static string Password;
private static IMongoDatabase _db = null;
private static readonly object LockHelper = new object();
/// <summary>
/// mongodb初始化
/// </summary>
public static void Init()
{
ConnectionStringHost = "10.1.5.24:27016,10.1.5.24:27016,10.1.5.26:27017";
//AppSettings.GetConfigValue("MongoHost");//"10.1.5.24:27016";
UserName = AppSettings.GetConfigValue("MongoUserName");
Password = AppSettings.GetConfigValue("MongoPwd");
}
static MongoDb()
{
}
public static IMongoDatabase GetDb(string dbName,string options=null)
{
if (_db != null) return _db;
lock (LockHelper)
{
if (_db != null) return _db;
var database = dbName;
var userName = UserName;
var password = Password;
var authentication = string.Empty;
var host = string.Empty;
if (!string.IsNullOrWhiteSpace(userName))
{
authentication = string.Concat(userName, ‘:‘, password, ‘@‘);
}
if (!string.IsNullOrEmpty(options) && !options.StartsWith("?"))
{
options = string.Concat(‘?‘, options);
}
host = string.IsNullOrEmpty(ConnectionStringHost) ? "localhost" : ConnectionStringHost;
database = database ?? "testdb";
//mongodb://[username:[email protected]]host1[:port1][,host2[:port2],…[,hostN[:portN]]][/[database][?options]]
var conString = options!=null? $"mongodb://{authentication}{host}/{database}{options}"
: $"mongodb://{authentication}{host}/{database}";
var url = new MongoUrl(conString);
var mcs = MongoClientSettings.FromUrl(url);
mcs.MaxConnectionLifeTime = TimeSpan.FromMilliseconds(1000);
var client = new MongoClient(mcs);
_db = client.GetDatabase(url.DatabaseName);
}
return _db;
}
}
/// <summary>
/// MongoDb 數據庫操作類
/// </summary>
public class MongoRepository<T>: IMongoRepository<T> where T : BaseEntity
{
#region readonly field
/// <summary>
/// 表名
/// </summary>
private readonly IMongoCollection<T> _collection = null;
/// <summary>
/// 數據庫對象
/// </summary>
private readonly IMongoDatabase _database;
#endregion
/// <summary>
/// 構造函數
/// </summary>
public MongoRepository()
{
this._database = MongoDb.GetDb(Activator.CreateInstance<T>().DbName, "readPreference =secondaryPreferred ");//primaryPreferred/secondaryPreferred/nearest
_collection = _database.GetCollection<T>(typeof(T).Name);
}
#region 增加
/// <summary>
/// 插入對象
/// </summary>
/// <param name="t">插入的對象</param>
public virtual T Insert(T t)
{
// var flag = ObjectId.GenerateNewId();
// t.GetType().GetProperty("Id").SetValue(t, flag);
//t.Time = DateTime.Now;
_collection.InsertOne(t);
return t;
}
/// <summary>
/// 批量插入
/// </summary>
/// <param name="ts">要插入的對象集合</param>
public virtual IEnumerable<T> InsertBatch(IEnumerable<T> ts)
{
_collection.InsertMany(ts);
return ts;
}
/// <summary>
/// 插入對象
/// </summary>
/// <param name="t">插入的對象</param>
public virtual void InsertAsync(T t)
{
//var flag = ObjectId.GenerateNewId();
// t.GetType().GetProperty("Id").SetValue(t, flag);
// t.Time = DateTime.Now;
_collection.InsertOneAsync(t);
}
/// <summary>
/// 批量插入
/// </summary>
/// <param name="ts">要插入的對象集合</param>
public virtual void InsertBatchAsync(IEnumerable<T> ts)
{
_collection.InsertManyAsync(ts);
}
#endregion
#region 刪除
/// <summary>
/// 刪除
/// </summary>
/// <returns></returns>
public virtual long Delete(T t)
{
var filter = Builders<T>.Filter.Eq("Id", t.Id);
var result = _collection.DeleteOne(filter);
return result.DeletedCount;
}
/// <summary>
/// 刪除
/// </summary>
/// <returns></returns>
public virtual void DeleteAsync(T t)
{
var filter = Builders<T>.Filter.Eq("Id", t.Id);
_collection.DeleteOneAsync(filter);
}
/// <summary>
/// 按條件表達式刪除
/// </summary>
/// <param name="predicate">條件表達式</param>
/// <returns></returns>
public virtual long Delete(Expression<Func<T, bool>> predicate)
{
var result = _collection.DeleteOne(predicate);
return result.DeletedCount;
}
/// <summary>
/// 按條件表達式刪除
/// </summary>
/// <param name="predicate">條件表達式</param>
/// <returns></returns>
public virtual void DeleteAsync(Expression<Func<T, bool>> predicate)
{
_collection.DeleteOneAsync(predicate);
}
/// <summary>
/// 按條件表達式批量刪除
/// </summary>
/// <param name="predicate">條件表達式</param>
/// <returns></returns>
public virtual long DeleteBatch(Expression<Func<T, bool>> predicate)
{
var result = _collection.DeleteMany(predicate);
return result.DeletedCount;
}
/// <summary>
/// 按條件表達式批量刪除
/// </summary>
/// <param name="predicate">條件表達式</param>
/// <returns></returns>
public virtual void DeleteBatchAsync(Expression<Func<T, bool>> predicate)
{
_collection.DeleteManyAsync(predicate);
}
/// <summary>
/// 按檢索條件刪除
/// 建議用Builders<T>構建復雜的查詢條件
/// </summary>
/// <param name="filter">條件</param>
/// <returns></returns>
public virtual long Delete(FilterDefinition<T> filter)
{
var result = _collection.DeleteOne(filter);
return result.DeletedCount;
}
/// <summary>
/// 按檢索條件刪除
/// 建議用Builders<T>構建復雜的查詢條件
/// </summary>
/// <param name="filter">條件</param>
/// <returns></returns>
public virtual void DeleteAsync(FilterDefinition<T> filter)
{
_collection.DeleteOneAsync(filter);
}
#endregion
#region 修改
/// <summary>
/// 修改(Id不變)
/// </summary>
/// <returns></returns>
public virtual long Update(T t)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id",t.Id);
var update = _collection.ReplaceOne(filter, t, new UpdateOptions() { IsUpsert = true });
return update.ModifiedCount;
}
/// <summary>
/// 修改(Id不變)
/// </summary>
/// <returns></returns>
public virtual void UpdateAsync(T t)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id", t.Id);
_collection.ReplaceOneAsync(filter, t, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 用新對象替換新文檔
/// </summary>
/// <param name="filter">查詢條件</param>
/// <param name="t">對象</param>
/// <returns>修改影響文檔數</returns>
public virtual long Update(Expression<Func<T, bool>> filter, T t)
{
var update = _collection.ReplaceOne(filter, t, new UpdateOptions() { IsUpsert = true });
return update.ModifiedCount;
}
/// <summary>
/// 用新對象替換新文檔
/// </summary>
/// <param name="filter">查詢條件</param>
/// <param name="t">對象</param>
/// <returns>修改影響文檔數</returns>
public virtual long Update(FilterDefinition<T> filter, T t)
{
var update = _collection.ReplaceOne(filter, t, new UpdateOptions() { IsUpsert = true });
return update.ModifiedCount;
}
/// <summary>
/// 用新對象替換新文檔
/// </summary>
/// <param name="filter">查詢條件</param>
/// <param name="t">對象</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateAsync(Expression<Func<T, bool>> filter, T t)
{
_collection.ReplaceOneAsync(filter, t, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 用新對象替換新文檔
/// </summary>
/// <param name="filter">查詢條件</param>
/// <param name="t">對象</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateAsync(FilterDefinition<T> filter, T t)
{
_collection.ReplaceOneAsync(filter, t, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據Id和條件文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="id">對象Id</param>
/// <returns>修改影響文檔數</returns>
public virtual long Update(string id, UpdateDefinition<T> update)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id", new ObjectId(id));
var result = _collection.UpdateOne(filter, update, new UpdateOptions() { IsUpsert = true });
return result.ModifiedCount;
}
/// <summary>
/// 根據Id和條件文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="id">對象Id</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateAsync(string id, UpdateDefinition<T> update)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id", new ObjectId(id));
_collection.UpdateOneAsync(filter, update, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據條件修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual void Update(UpdateDefinition<T> update,Expression<Func<T, bool>> filter)
{
_collection.UpdateOne(filter, update, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據條件修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual long Update(UpdateDefinition<T> update, FilterDefinition<T> filter)
{
var result = _collection.UpdateOne(filter, update, new UpdateOptions() { IsUpsert = true });
return result.ModifiedCount;
}
/// <summary>
/// 根據條件修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateAsync(UpdateDefinition<T> update, Expression<Func<T, bool>> filter)
{
_collection.UpdateOneAsync(filter, update, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據條件修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateAsync(UpdateDefinition<T> update, FilterDefinition<T> filter)
{
_collection.UpdateOneAsync(filter, update, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據條件批量修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual long UpdateBatch(UpdateDefinition<T> update, Expression<Func<T, bool>> filter)
{
var result = _collection.UpdateMany(filter, update, new UpdateOptions() { IsUpsert = true });
return result.ModifiedCount;
}
/// <summary>
/// 根據條件批量修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual long UpdateBatch(UpdateDefinition<T> update, FilterDefinition<T> filter)
{
var result = _collection.UpdateMany(filter, update, new UpdateOptions() { IsUpsert = true });
return result.ModifiedCount;
}
/// <summary>
/// 根據條件批量修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateBatchAsync(UpdateDefinition<T> update, Expression<Func<T, bool>> filter)
{
_collection.UpdateManyAsync(filter, update, new UpdateOptions() { IsUpsert = true });
}
/// <summary>
/// 根據條件批量修改文檔
/// </summary>
/// <param name="update">修改條件-形如:Builders/<T/>.Update.Set(filed, value)</param>
/// <param name="filter">查詢條件Builders/<T/>.Filter.Eq(filed, value)</param>
/// <returns>修改影響文檔數</returns>
public virtual void UpdateBatchAsync(UpdateDefinition<T> update, FilterDefinition<T> filter)
{
_collection.UpdateManyAsync(filter, update, new UpdateOptions() { IsUpsert = true });
}
#endregion
#region 查詢
#region GetCollection
/// <summary>
/// 獲取操作對象的IMongoCollection集合,強類型對象集合
/// </summary>
/// <returns></returns>
public virtual IMongoCollection<T> GetCollection()
{
return _database.GetCollection<T>(typeof(T).Name);
}
#endregion
#region GetSingle
/// <summary>
/// 查詢數據庫,檢查是否存在指定ID的對象
/// </summary>
/// <param name="id">對象的ID值</param>
/// <returns>存在則返回指定的對象,否則返回Null</returns>
public virtual T GetById(string id)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id", new ObjectId(id));
var data = _collection.Find(filter).FirstOrDefault();
return data;
}
/// <summary>
/// 查詢數據庫,檢查是否存在指定ID的對象
/// </summary>
/// <param name="id">對象的ID值</param>
/// <returns>存在則返回指定的對象,否則返回Null</returns>
public virtual async Task<T> GetAsyncById(string id)
{
var filterBuilder = Builders<T>.Filter;
var filter = filterBuilder.Eq("Id", new ObjectId(id));
var data = await _collection.FindAsync(filter);
return await data.SingleOrDefaultAsync();
}
/// <summary>
/// 查詢數據
/// </summary>
/// <param name="filter">過濾條件</param>
/// <returns></returns>
public virtual T Get(FilterDefinition<T> filter)
{
return _collection.Find(filter).FirstOrDefault();
}
/// <summary>
/// 查詢數據
/// </summary>
/// <param name="filter">條件表達式</param>
/// <returns></returns>
public virtual T Get(Expression<Func<T,bool>> filter)
{
return _collection.Find(filter).FirstOrDefault();
}
/// <summary>
/// 查詢數據
/// </summary>
/// <param name="filter">過濾條件</param>
/// <returns></returns>
public virtual async Task<T> GetAsync(FilterDefinition<T> filter)
{
var data = await _collection.FindAsync(filter);
return await data.SingleOrDefaultAsync();
}
/// <summary>
/// 查詢數據
/// </summary>
/// <param name="filter">條件表達式</param>
/// <returns></returns>
public virtual async Task<T> GetAsync(Expression<Func<T, bool>> filter)
{
var data = await _collection.FindAsync(filter);
return await data.SingleOrDefaultAsync();
}
#endregion
#region GetMany
/// <summary>
/// 查詢部分數據
/// </summary>
/// <param name="filter">過濾條件</param>
/// <returns></returns>
public virtual IEnumerable<T> GetMany(FilterDefinition<T> filter)
{
return _collection.Find(filter).ToEnumerable();
}
/// <summary>
/// 查詢部分數據
/// </summary>
/// <param name="filter">條件表達式</param>
/// <returns></returns>
public virtual IEnumerable<T> GetMany(Expression<Func<T,bool>> filter)
{
//return _collection.AsQueryable().Where(filter).ToList();
//return _collection.AsQueryable().Where(filter);
return _collection.Find(filter).ToEnumerable(); //.ToEnumerable();
}
/// <summary>
/// 查詢部分數據
/// </summary>
/// <param name="filter">過濾條件</param>
/// <returns></returns>
public virtual async Task<IEnumerable<T>> GetManyAsync(FilterDefinition<T> filter)
{
var data = await _collection.FindAsync(filter);
return await data.ToListAsync();
}
/// <summary>
/// 查詢部分數據
/// </summary>
/// <param name="filter">過濾條件</param>
/// <returns></returns>
public virtual async Task<IEnumerable<T>> GetManyAsync(Expression<Func<T, bool>> filter)
{
var data = await _collection.FindAsync(filter);
return await data.ToListAsync();
}
#endregion
#region GetAll
/// <summary>
/// 查詢所有記錄,復雜查詢直接用Linq處理(避免全表掃描)
/// </summary>
/// <returns>要查詢的對象</returns>
public virtual IEnumerable<T> GetAll()
{
var data = _collection.AsQueryable();
return data.ToEnumerable();
}
/// <summary>
/// 查詢所有記錄,復雜查詢直接用Linq處理(避免全表掃描)
/// </summary>
/// <returns>要查詢的對象</returns>
public virtual async Task<IEnumerable<T>> GetAllAsync()
{
var data = _collection.AsQueryable();
return await data.ToListAsync();
}
/// <summary>
/// 查詢所有記錄,復雜查詢直接用Linq處理(避免全表掃描)
/// </summary>
/// <returns>要查詢的對象</returns>
public virtual IQueryable<T> GetAllQueryable()
{
return _collection.AsQueryable();
}
#endregion
#region MapReduce
/// <summary>
/// MapReduce
/// </summary>
/// <returns>返回一個List列表數據</returns>
public IEnumerable<T> GetMap(BsonJavaScript map,BsonJavaScript reduce)
{
return _collection.MapReduce<T>(map,reduce).ToList();
}
#endregion
#endregion
}
好了,就介紹到這裏。
windows7下MongoDB(V3.4)的使用及倉儲設計