MongoHelper
来源：互联网 发布：淘宝怎么样修改评价 编辑：程序博客网 时间：2024/05/28 09:33
来自：http://www.cnblogs.com/it9527/archive/2011/08/01/2123997.html
using System;using System.Collections.Generic;using System.Text;using MongoDB.Driver;using MongoDB.Bson;using System.Configuration;namespace DBUtility{ /// <summary> /// MongoDB 的数据库访问帮助类 /// </summary> public abstract class MongoHelper { //数据库url 集合名称 private static readonly string MongoDatabaseUrl = ConfigurationManager.ConnectionStrings["MongoDbUrl"].ConnectionString; private static readonly string MongoCollectionName = ConfigurationManager.AppSettings["CollectionName"]; /// <summary> /// 查询 /// </summary> /// <param name="url">MongoUrl的String表示，该Url必须包含数据库名称</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件，null表示查询所有</param> /// <param name="fields">字段名称，null表示所有字段</param> /// <param name="sortBy">排序字段，null表示不进行排序</param> /// <returns>返回表示该查询结果的MongoCursor</returns> public static MongoCursor<BsonDocument> Find( string url, string collection, IMongoQuery query, IMongoFields fields, IMongoSortBy sortBy ) { return Find(url, collection, query, fields, sortBy, 0, 0); } /// <summary> /// 查询，先排序，然后skip，接着limit /// </summary> /// <param name="url">MongoUrl的String表示，该Url必须包含数据库名称</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件，null表示查询所有</param> /// <param name="fields">字段名称，null表示所有字段</param> /// <param name="sortBy">排序字段，null表示不进行排序</param> /// <param name="skip">跳过的Document数</param> /// <param name="limit">返回的记录数，设置为 0 表示返回所有</param> /// <returns>返回表示该查询结果的MongoCursor</returns> public static MongoCursor<BsonDocument> Find( string url, string collection, IMongoQuery query, IMongoFields fields, IMongoSortBy sortBy, int skip, int limit ) { MongoCursor<BsonDocument> retCursor = null; MongoCollection coll = GetCollection(url, collection); retCursor = coll.FindAs<BsonDocument>(query); if (fields != null) retCursor.SetFields(fields); if (sortBy != null) retCursor.SetSortOrder(sortBy); retCursor.Skip = skip; retCursor.Limit = limit; return retCursor; } /// <summary> /// 查询匹配查询结果的第一条记录 /// </summary> /// <param name="url">MongoUrl的String表示，该Url必须包含数据库名称</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件，null表示查询所有</param> /// <returns>返回表示该查询结果的BsonDocument</returns> public static BsonDocument FindOne( string url, string collection, IMongoQuery query) { MongoCollection c = GetCollection(url, collection); return c.FindOneAs<BsonDocument>(query); } /// <summary> /// 插入一个文档 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <param name="data">一个表示文档的BsonDocument对象</param> /// <returns>返回执行那个的SafeModeResult</returns> public static SafeModeResult Insert( string url, string collection, BsonDocument document ) { SafeModeResult smr = new SafeModeResult(); if (document != null) return GetCollection(url, collection).Insert<BsonDocument>(document, SafeMode.True); else throw new ArgumentNullException("参数 document 不能为空"); } /// <summary> /// 更新多个匹配条件query的记录 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件，不能为null</param> /// <param name="update">更新字段及数据，相当于 set fieldName=newValue，不能为null</param> /// <returns>返回SafeModeResult</returns> public static SafeModeResult Update( string url, string collection, IMongoQuery query, IMongoUpdate update ) { return MongoHelper.Update(url, collection, query, UpdateFlags.Multi, update); } /// <summary> /// 更新匹配条件query的文档，需要设定更新方式 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件，不能为null</param> /// <param name="update">更新字段及数据，相当于 set fieldName=newValue，不能为null</param> /// <param name="flags">更新方式</param> /// <returns>返回SafeModeResult</returns> public static SafeModeResult Update( string url, string collection, IMongoQuery query, UpdateFlags flags, IMongoUpdate update ) { if (query == null) throw new ArgumentNullException("参数 query 不能为null"); if(update == null) throw new ArgumentNullException("参数 update 不能为null"); MongoCollection c = GetCollection(url, collection); return c.Update(query, update, flags, SafeMode.True); } /// <summary> /// 删除所有匹配query的记录，如果query为null则删除所有记录 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件</param> /// <returns>返回SafeModeResult</returns> public static SafeModeResult Remove( string url, string collection, IMongoQuery query) { return MongoHelper.Remove(url, collection, query, RemoveFlags.None); } /// <summary> /// 删除第一条匹配query的记录，如果query为null则删除集合的第一条记录 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <param name="query">查询条件</param> /// <param name="flags">删除方式</param> /// <returns>返回SafeModeResult</returns> public static SafeModeResult Remove( string url, string collection, IMongoQuery query, RemoveFlags flags ) { MongoCollection c = GetCollection(url, collection); return c.Remove(query, flags, SafeMode.True); } /// <summary> /// 返回由url和collection指定的MongoCollection对象 /// </summary> /// <param name="url">MongoUrl的String表示</param> /// <param name="collection">集合名称</param> /// <returns></returns> private static MongoCollection GetCollection( string url, string collection) { MongoUrl u = new MongoUrl(url); MongoServer s = MongoServer.Create(u); MongoDatabase db = s.GetDatabase(u.DatabaseName); MongoCollection c = db.GetCollection(collection); return c; } }}
