C# 多线程并发处理数据库数据，发送信号等待处理完统一插入

资料来源：网络整理时间：2023/2/14 0:35:44 共计：3607 浏览

public class JPService
    {
        public JPService()
        {
            //设定最大的Net并发连接数
            System.Net.ServicePointManager.DefaultConnectionLimit = 500;
            ThreadPool.SetMinThreads(15 , 2);//设置最小的工作线程数和IO线程数
            Config.Load();
        }
        private int MaxThread = 10;//最大的纠偏线程数

        private static Random m_rand = new Random(Guid.NewGuid().GetHashCode());//创建随机数
        private static object m_objLock = new object();//添加列表锁定

        private AutoResetEvent[] InitAutoResetEvent()
        {
            //对每个线程提供一个完成信号，初始化为未终止状态
           AutoResetEvent[] autoEvents = new AutoResetEvent[MaxThread];
            for (int i = 0; i < MaxThread; i++)
                autoEvents[i] = new AutoResetEvent(false);
            return autoEvents;
        }
        /// <summary>
        /// 将处理完的信息添加至List列表
        /// </summary>
        /// <param name="lst"></param>
        /// <param name="info"></param>
        public void AddItemToList(List<EntityJPGpsInfo> lst , EntityJPGpsInfo info)
        {
            lock (m_objLock)
            {
                lst.Add(info);
            }
        }

        public void OnStart()
        {

try
{

//在线程池中引入可执行的方法，一个循环不断判断

ThreadPool.QueueUserWorkItem(_ =>
{

//不断循环，直到当前有数据可以纠偏，则将该方法加入线程池

while (true)
{

                 AutoResetEvent[] autoEvents = InitAutoResetEvent();
               List<EntityJPGpsInfo> lst = new List<EntityJPGpsInfo>();
                            //得到处理数据   集
                            DataSet ds = GetBeforeJP();
                            //验证数据是否存在（null）
                            if (!DataHelper.VerifyDataSet(ds))
                            {
                                Thread.Sleep(100);
                                continue; //如果检测DataSet可行，则继续
                            }

                            int iCount = ds.Tables[0].Rows.Count; //获取要处理的数据行数
                            int iBlock = (int)Math.Ceiling((double)iCount / MaxThread);//根据行数，线程数设定每个线程要处理的数据量
                            for (int i = 0; i < MaxThread; i++) //像线程池加入执行队列
                            {
                                ThreadPool.QueueUserWorkItem(data =>
                                    {
                                        int iIndex = (int)data;//线程序号0->MaxThread
                                        DataRowCollection rows = ds.Tables[0].Rows;
                                        for (int j = 0; j < iBlock; j++)
                                        {
                                            try
                                            {
                                                if (iIndex * iBlock + j >= iCount)//避免最后一个线程索引越界
                                                    break;
                                                int iSequence = DataHelper.ReadInt(rows[iIndex * iBlock + j] , "SEQUENCE");
                                                int iMCUID = DataHelper.ReadInt(rows[iIndex * iBlock + j] , "MCUID");
                                                int iLng = DataHelper.ReadInt(rows[iIndex * iBlock + j] , "LONGITUDE") / 36;
                                                int iLat = DataHelper.ReadInt(rows[iIndex * iBlock + j] , "LATITUDE") / 36;
                                                DateTime dtmPostionTime = DataHelper.ReadDateTime(rows[iIndex * iBlock + j] , "POSITIONTIME");
                                                DateTime dtmReceiveTime = DataHelper.ReadDateTime(rows[iIndex * iBlock + j] , "RECEIVETIME");
                                                try
                                                {
                                                    //请求指定网页地址进行处理返回结果
                                                    WebRequest jpRequest = WebRequest.Create(Config.BMSSettings.JPUrl + iLng.ToString() + "," + iLat.ToString() + "&t=" + m_rand.Next());
                                                    jpRequest.Method = "get";
                                                    jpRequest.ContentType = "application/x-www-form-urlencoded";
                                                    jpRequest.Timeout = 8000;//设置超时
                                                    WebResponse jpResponse = jpRequest.GetResponse();

                                                    string strJP;
                                                    using (StreamReader sr = new StreamReader(jpResponse.GetResponseStream()))
                                                    {
                                                        strJP = sr.ReadToEnd();
                                                        if (!string.IsNullOrEmpty(strJP))
                                                        {
                                                            strJP = strJP.Remove(strJP.Length - 1 , 1);
                                                            string[] strs = strJP.Split(new char[] { ',' });
                                                            //处理完加入列表
                                                            AddItemToList(lst , new EntityJPGpsInfo(iSequence , iMCUID , Convert.ToInt32(strs[0]) * 36 , Convert.ToInt32(strs[1]) * 36 , dtmPostionTime , dtmReceiveTime));
                                                        }
                                                    }
                                                    jpResponse.Close();
                                                }
                                                catch (Exception ex)
                                                {
                                                    LogHelper.Writeln("Error1:" + ex.Message);
                                                }
                                            }
                                            catch (Exception e)
                                            {
                                                LogHelper.Writeln("Error2:" + e.StackTrace);
                                            }
                                        }
                                        autoEvents[iIndex].Set();
                                    } , i);
                            }
                            //等待收到所有的信号
                            ManualResetEvent.WaitAll(autoEvents);
                            InsertToDB(lst); //处理完集体插入到数据库
                        }
                    });
            }
            catch (Exception exc)
            {
                LogHelper.Writeln("Error3：" + exc.StackTrace);
            }
        }
        /// <summary>
        /// 数据库提取预处理数据
        /// </summary>
        /// <returns>预处理数据集</returns>
        public DataSet GetBeforeJP()
        {
            OracleParameter[] paras = new OracleParameter[]
            {
                OracleHelper.MakeOutParam("curCursor",OracleType.Cursor)
            };
            return OracleHelper.ExecuteDataSet(Config.BMSSettings.ConnectionString , "SP_GIS_GET_BEFOREJP" , paras);
        }
        /// <summary>
        /// 全部循环插入到数据库
        /// </summary>
        /// <param name="lst">插入数据列表</param>
        public void InsertToDB(List<EntityJPGpsInfo> lst)
        {
            using (OracleConnection conn = OracleHelper.GetConnection(Config.BMSSettings.ConnectionString))
            {
                conn.Open();
                OracleCommand command = conn.CreateCommand();
                OracleTransaction trans = conn.BeginTransaction();
                try
                {
                    command.Transaction = trans;
                    command.Parameters.AddRange(new OracleParameter[]
                    {
                        new OracleParameter("iSequence",OracleType.Number),
                        new OracleParameter("iMCUID",OracleType.Number),
                        new OracleParameter("iLongitude",OracleType.Number),
                        new OracleParameter("iLatitude",OracleType.Number),
                        new OracleParameter("dtmPositionTime",OracleType.DateTime),
                        new OracleParameter("dtmReceiveTime",OracleType.DateTime)
                    });

                    foreach (EntityJPGpsInfo info in lst)
                    {
                        command.Parameters[0].Value = info.Sequence;
                        command.Parameters[1].Value = info.MCUID;
                        command.Parameters[2].Value = info.Longitude;
                        command.Parameters[3].Value = info.Latitude;
                        command.Parameters[4].Value = info.PositionTime;
                        command.Parameters[5].Value = info.ReceiveTime;
                        command.CommandType = CommandType.StoredProcedure;
                        command.CommandText = "SP_GIS_ADD_JP";
                        command.ExecuteNonQuery();
                    }
                    trans.Commit();
                }
                catch (Exception ex)
                {
                    trans.Rollback();
                    throw ex;
                }
            }
        }
}

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