.Net Core對MongoDB執行多條件查詢

以前項目基本上全部使用MySQL數據庫, 最近項目排期空出了一點時間leader決定把日志模塊遷移到插入/查詢性能更好的MongoDB上. 多條件查詢的寫法着實費了些功夫, 撰文記錄一下.

一、准備工作

1. 安裝過程, 不贅述了

2. 添加ReferencePackage

dotnet add package mongodb.bson
dotnet add package mongodb.driver

3. appsetting.json添加連接配置

"MongodbHost": {
    "Connection": "mongodb://[username]:[password]@[ip]:[port]",
    "DataBase": "[database]",
    "Table": ""
  },

4. 獲取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"] };
}

 

二、查詢方法

這里的查詢方法是網上找的, 直接拿來用了. 如果是單一數據源的話, 這里的host可以提取出來成為helper類的屬性.

#region FindListByPage 分頁查詢集合
    /// <summary>
    /// 分頁查詢集合
    /// </summary>
    /// <param name="filter">查詢條件</param>
    /// <param name="pageIndex">當前頁</param>
    /// <param name="pageSize">頁容量</param>
    /// <param name="count">總條數</param>
    /// <param name="field">要查詢的字段,不寫時查詢全部</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));
            //不指定查詢字段
            if (field == null || field.Length == 0)
            {
                if (sort == null) return client.Find(filter).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
                //進行排序
                return client.Find(filter).Sort(sort).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
            }

            //指定查詢字段
            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();

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

        }
        catch (Exception ex)
　　{
　　　　throw ex;
　　}
}
#endregion

 

三、調用查詢方法

這里還踩了一個坑. MongoDB里存儲的時間是格林尼治時間, 插入8:00, 查詢時會發現變成了0:00,所以定義時間屬性的時候需要加個標簽

[BsonDateTimeOptions(Kind = DateTimeKind.Local)]
public DateTime logtime { get; set; }

   這里的OprLogModel是定義了查詢條件的類.

public static LogPager<log_operate> Get_operate_log_mongo(OprLogModel qModel)
{
　　LogPager<log_operate> pager = new LogPager<log_operate>();
　　FilterDefinition<log_operate> filters;

 6　　 var sortbuilder = Builders<log_operate>.Sort;
　　var sort = sortbuilder.Descending("operate_time");

　　#region 用戶權限過濾
　　IEnumerable<string> IdList = dev_deviceRepository.GetBinding(qModel.user_id);
11　　 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

也可以先定義一個空的filterdefinition, 然后與各查詢條件通過And聚合:

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);