.Net Core如何对MongoDB执行多条件查询_ASP.NET教程

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.

一、准备工作

1. 安装过程, 不赘述了

2. 添加ReferencePackage

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									dotnet add package mongodb.bson

									dotnet add package mongodb.driver

3. appsetting.json添加连接配置

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									"MongodbHost": {

									  "Connection": "mongodb://[username]:[password]@[ip]:[port]",

									  "DataBase": "[database]",

									  "Table": ""

									 },

4. 获取MongoDBConfig 的方法

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									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"] };

									}

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.

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									#region FindListByPage 分页查询集合

									  /// <summary>

									  /// 分页查询集合

									  /// </summary>

									  /// <param name="filter">查询条件</param>

									  /// <param name="pageIndex">当前页</param>

									  /// <param name="pageSize">页容量</param>

									  /// <param name="count">总条数</param>

									  /// <param name="field">要查询的字段,不写时查询全部</param>

									  /// <param name="sort">要排序的字段</param>

									  /// <returns></returns>

									  public static List<T> FindListByPage(FilterDefinition<T> filter, int pageIndex, int pageSize, out int count, string[] field = null, SortDefinition<T> sort = null)

									  {

									    try

									    {

									      MongodbHostOptions host = Tools.AppSettingsTools.MongodbConfig();

									      host.Table = "WSMessageLog";

									      var client = MongodbClient<T>.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<ProjectionDefinition<T>>();

									      for (int i = 0; i < field.Length; i++)

									      {

									        fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));

									      }

									      var projection = Builders<T>.Projection.Combine(fieldList);

									      fieldList?.Clear();

									      //不排序

									      if (sort == null) return client.Find(filter).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();

									      //排序查询

									      return client.Find(filter).Sort(sort).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();

									    }

									    catch (Exception ex)

									　　{

									　　　　throw ex;

									　　}

									}

									#endregion

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

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									[BsonDateTimeOptions(Kind = DateTimeKind.Local)]

									public DateTime logtime { get; set; }

这里的OprLogModel是定义了查询条件的类.

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									public static LogPager<log_operate> Get_operate_log_mongo(OprLogModel qModel)

									{

									　　LogPager<log_operate> pager = new LogPager<log_operate>();

									　　FilterDefinition<log_operate> filters;

									　　 var sortbuilder = Builders<log_operate>.Sort;

									　　var sort = sortbuilder.Descending("operate_time");

									　　#region 用户权限过滤

									　　IEnumerable<string> IdList = dev_deviceRepository.GetBinding(qModel.user_id);

									　　 filters = Builders<log_operate>.Filter.In("device_id", IdList);

									　　#endregion

									　　if (!string.IsNullOrEmpty(qModel.device_id))

									  {

									  　　var filters_did = Builders<log_operate>.Filter.Eq("device_id", qModel.device_id);

									  　　filters = Builders<log_operate>.Filter.And(filters, filters_did);

									　　}

									　　if (qModel.sDate != null)

									　　{

									　　　　var filters_sdate = Builders<log_operate>.Filter.Gte<DateTime>("operate_time", Convert.ToDateTime(qModel.sDate));

									　　　　filters = Builders<log_operate>.Filter.And(filters, filters_sdate);

									　　}

									　　if (qModel.eDate != null)

									　　{

									　　　　var filters_edate = Builders<log_operate>.Filter.Lte<DateTime>("operate_time", Convert.ToDateTime(qModel.eDate));

									　　　　filters = Builders<log_operate>.Filter.And(filters, filters_edate);

									　　}

									　　int total;

									　　pager.data = MongoTools<log_operate>.FindListByPage(filters, qModel.pageindex, (qModel.pageindex - 1) * qModel.pagesize, out total, null, sort);

									　　pager.total = total;

									　　return pager;

									}

									#endregion

也可以先定义一个空的filterdefinition, 然后与各查询条件通过And聚合:

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									FilterDefinition<log_operate> filters = FilterDefinition<log_operate>.Empty;

									var filters_idlist = Builders<log_operate>.Filter.In("device_id", IdList);

									filters = Builders<log_operate>.Filter.And(filters, filters_idlist);