以前项目基本上全部使用MySQL数据库, 最近项目排期空出了一点时间leader决定把日志模块迁移到插入/查询性能更好的MongoDB上. 多条件查询的写法着实费了些功夫, 撰文记录一下.
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一、准备工作
1. 安装过程, 不赘述了
2. 添加ReferencePackage
dotnet add package mongodb.bson dotnet add package mongodb.driver
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3. appsetting.json添加连接配置
"MongodbHost": { "Connection": "mongodb://[username]:[password]@[ip]:[port]", "DataBase": "[database]", "Table": "" },
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4. 获取MongoDBConfig 的方法
public static MongodbHostOptions MongodbConfig() { var builder = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json"); IConfiguration Configuration = builder.Build(); var option = Configuration.GetSection("MongodbHost"); return new MongodbHostOptions { Connection = option["Connection"], DataBase = option["DataBase"], Table = option["Table"] }; }
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二、查询方法
这里的查询方法是网上找的, 直接拿来用了. 如果是单一数据源的话, 这里的host可以提取出来成为helper类的属性.
#region FindListByPage 分页查询集合 /// /// 分页查询集合 /// /// 查询条件 /// 当前页 /// 页容量 /// 总条数 /// 要查询的字段,不写时查询全部 /// 要排序的字段 /// public static List FindListByPage(FilterDefinition filter, int pageIndex, int pageSize, out int count, string[] field = null, SortDefinition sort = null) { try { MongodbHostOptions host = Tools.AppSettingsTools.MongodbConfig(); host.Table = "WSMessageLog"; var client = MongodbClient.MongodbInfoClient(host); count = Convert.ToInt32(client.CountDocuments(filter)); //不指定查询字段 if (field == null || field.Length == 0) { if (sort == null) return client.Find(filter).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList(); //进行排序 return client.Find(filter).Sort(sort).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList(); } //指定查询字段 var fieldList = new List>(); for (int i = 0; i < field.Length; i++) { fieldList.Add(Builders.Projection.Include(field[i].ToString())); } var projection = Builders.Projection.Combine(fieldList); fieldList?.Clear(); //不排序 if (sort == null) return client.Find(filter).Project(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList(); //排序查询 return client.Find(filter).Sort(sort).Project(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList(); } catch (Exception ex) { throw ex; } } #endregion
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三、调用查询方法
这里还踩了一个坑. MongoDB里存储的时间是格林尼治时间, 插入8:00, 查询时会发现变成了0:00,所以定义时间属性的时候需要加个标签
[BsonDateTimeOptions(Kind = DateTimeKind.Local)] public DateTime logtime { get; set; }
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这里的OprLogModel是定义了查询条件的类.
public static LogPager Get_operate_log_mongo(OprLogModel qModel) { LogPager pager = new LogPager(); FilterDefinition filters; var sortbuilder = Builders.Sort; var sort = sortbuilder.Descending("operate_time"); #region 用户权限过滤 IEnumerable IdList = dev_deviceRepository.GetBinding(qModel.user_id); filters = Builders.Filter.In("device_id", IdList); #endregion if (!string.IsNullOrEmpty(qModel.device_id)) { var filters_did = Builders.Filter.Eq("device_id", qModel.device_id); filters = Builders.Filter.And(filters, filters_did); } if (qModel.sDate != null) { var filters_sdate = Builders.Filter.Gte("operate_time", Convert.ToDateTime(qModel.sDate)); filters = Builders.Filter.And(filters, filters_sdate); } if (qModel.eDate != null) { var filters_edate = Builders.Filter.Lte("operate_time", Convert.ToDateTime(qModel.eDate)); filters = Builders.Filter.And(filters, filters_edate); } int total; pager.data = MongoTools.FindListByPage(filters, qModel.pageindex, (qModel.pageindex - 1) * qModel.pagesize, out total, null, sort); pager.total = total; return pager; } #endregion
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也可以先定义一个空的filterdefinition, 然后与各查询条件通过And聚合:
FilterDefinition filters = FilterDefinition.Empty; var filters_idlist = Builders.Filter.In("device_id", IdList); filters = Builders.Filter.And(filters, filters_idlist);
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以上是.Net Core对MongoDB执行多条件查询的详细内容。更多信息请关注PHP中文网其他相关文章！
