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HomeDatabaseMysql Tutorial大数据量数据存储分表实例(企业级应用系统)附原码

大数据量数据存储分表实例(企业级应用系统)附原码

Jun 07, 2016 pm 02:50 PM
Enterprisesub-tableOriginal codestorageExampleoperating systemdataalong with

随着数据不断增长,数据库中单表无法满足大数据量的存储,所以我们就提出按照自然时间、单站点信息分表来存储大量秒级数据。 例如:大气、水利、交通(GPS)信息监测系统中的实时数据进行存储,一般时按照开始时间、结束时间、单站点、多站点、监测项目等方

随着数据不断增长,数据库中单表无法满足大数据量的存储,所以我们就提出按照自然时间、单站点信息分表来存储大量秒级数据。

例如:大气、水利、交通(GPS)信息监测系统中的实时数据进行存储,一般时按照开始时间、结束时间、单站点、多站点、监测项目等方式进行数据查询、分析、图表。

如 按5分钟单站点的数据12*24(小时)*365(天)*(监测项)10=100W ,也就是一个站点一年数据量 100w条,100站*100W =1亿条这样的数据是无法满足快速查询。

所以我们就按照 ”tb_5M_年_站号“建表名称,tb_时间刻度_年份_站号建表 。 "TB_5M_2016_A0001", "TB_5M_2016_A0002", "TB_5M_2016_A0003",, "TB_5M_2016_A0004"

条张表 存储100W,如存储1分钟的数据单表就 500W条, 如1秒钟数据:60*500W=3亿条数据,这样不行啊,我们要以在分表,分表规则中加一个月份,tb_5M_年_月_站号,这里就不说了。

问题来,我们如何方便快捷编写代码那?,我们还想用ORM(EF)进行数据查询,就拿我们真实项目来说吧。

思路,我们用.NET开发,在数据库建基本表(tb_5m_Base)来实现EF,用 DbContext实现数据访问。

别的不多说了,直接来代码吧,

功能5分钟数据查询,用户指定开始时间、结束时间、单(多)选择站点、单(多)选择监测 项目,进行数据查询功能。

代码发如下:


public class Tb_5m_Base
    {
       
        public int   ID{ get; set; }
        public Datatime Time{ get; set; }
        public string Pcodes  { get; set; }
         
        public double Values{ get; set; }
    }



 public partial class EntityFrameworkDataContext : DbContext
    {
        static EntityFrameworkDataContext()
        {
            Database.SetInitializer(null);
        }


        public EntityFrameworkDataContext()
            : base("Name=EntityFrameworkDataContext")
        {
        }

     protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
         
            modelBuilder.Configurations.Add(new tb_5m_Base());
          }

    public DbSet  TB_5m_Base{ get; set; }
     

}

  public class BLLDataQuery
    {
      

       ///


        /// 获取数据
        ///

     
        /// 开始日期
        /// 结果日期

       /// 站点ID :1,2,3

       /// 监测项 :EC,PC,MC
        ///
 public static List GetMinuteData( DateTime startTime, DateTime endTime,string stationids, string pcodus)
 {
    List list = new List();
    string[] strArray = stationids.Split(new char[] { ',' });
    int year = startTime.Year;
    int num = endTime.Year;
    string str = string.Empty;
    string commandText = string.Empty;
    pcodus=pcodus;
    while (year     {
        foreach (string strstationid in strArray) //站点
        {
            tbname= string.Format("tb_5m_{0}_{1}_Src", year, strstationid );
            commandText = string.Format("Select * from {0} where TIME between '{1}' and '{2}' and  pcodes in ({3}) ", new object[] { tbname, startTime, endTime, pcodus});
            try
            {
                using (EntityFrameworkDataContext _dbcontext = EntityFrameworkDataContext.CreateDbContext)
                {
                    list.AddRange(_dbcontext.Database.SqlQuery(sql,new paramentList[0]).ToList());
                }
            }
            catch (Exception exception)
            {
              
            }
        }
        year++;
    }
    return list;
}


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