C# & SQL 服务器数据库：记录 Parallel.ForEach 错误

Question

我正在尝试用 3 个不同的.txt文件填充我的 SQL 服务器数据库，我使用常规文件完成了此操作，但这需要很长时间。 然后由于顺序无关紧要（在我的数据库中）我尝试使用Parallel.ForEach但我收到此错误错误

这是我的代码

using System;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data;

namespace LogwithDataBase
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=LogsUploaded;Integrated Security=SSPI");

        void filldata()
        {
            SqlDataAdapter da = new SqlDataAdapter("Select *From LogsTable", con);
            DataSet ds = new DataSet();
            con.Open();

            da.Fill(ds, "LogsTable");

            dataGridView1.DataSource = ds.Tables["LogsTable"];
            dataGridView1.Columns[1].DefaultCellStyle.Format = "yyyy-MM-dd HH:mm:ss.fff";
            con.Close();
        }

        private void datab_connect_Click(object sender, EventArgs e)
        {
            con.Open();
            IEnumerable<string> lines1 = File.ReadLines(openFileDialog1.FileName); //HWLog

            Parallel.ForEach(lines1, line1 =>
            {
                string timeStmp = line1.Split('\t')[0];
                string atmIdd = line1.Split('\t')[1];
                string fileTyp = "HWLog";
                string evenTex = line1.Split('\t')[2];
                string query = "INSERT INTO LogsTable (timestampof_log,atmID,fileType,eventText) values (@timeStmp, @atmIdd, @fileTyp, @evenTex)";
                SqlCommand cmd = new SqlCommand(query, con);
                cmd.Parameters.AddWithValue("@timeStmp", DateTime.Parse(timeStmp));
                cmd.Parameters.AddWithValue("@atmIdd", atmIdd);
                cmd.Parameters.AddWithValue("@fileTyp", fileTyp);
                cmd.Parameters.AddWithValue("@evenTex", evenTex);
                cmd.ExecuteNonQuery();
            });

            IEnumerable<string> lines2 = File.ReadLines(openFileDialog2.FileName); //SWLog
            Parallel.ForEach(lines2, line2 =>
            {
                string timeStmp = line2.Split('\t')[0];
                string atmIdd = line2.Split('\t')[1];
                string fileTyp = "SWLog";
                string evenTex = line2.Split('\t')[2];
                string query = "INSERT INTO LogsTable (timestampof_log,atmID,fileType,eventText) values (@timeStmp, @atmIdd, @fileTyp, @evenTex)";
                SqlCommand cmd = new SqlCommand(query, con);
                cmd.Parameters.AddWithValue("@timeStmp", DateTime.Parse(timeStmp));
                cmd.Parameters.AddWithValue("@atmIdd", atmIdd);
                cmd.Parameters.AddWithValue("@fileTyp", fileTyp);
                cmd.Parameters.AddWithValue("@evenTex", evenTex);
                cmd.ExecuteNonQuery();
            });

            IEnumerable<string> lines3 = File.ReadLines(openFileDialog3.FileName); //JournalLog
            Parallel.ForEach(lines3, line3 =>
            {
                string timeStmp = line3.Split('\t')[0];
                string atmIdd = line3.Split('\t')[1];
                string fileTyp = "JournalLog";
                string evenTex = line3.Split('\t')[2];
                string query = "INSERT INTO LogsTable (timestampof_log, atmID, fileType, eventText) VALUES (@timeStmp, @atmIdd, @fileTyp, @evenTex)";

                SqlCommand cmd = new SqlCommand(query, con);

                cmd.Parameters.AddWithValue("@timeStmp", DateTime.Parse(timeStmp));
                cmd.Parameters.AddWithValue("@atmIdd", atmIdd);
                cmd.Parameters.AddWithValue("@fileTyp", fileTyp);
                cmd.Parameters.AddWithValue("@evenTex", evenTex);

                cmd.ExecuteNonQuery();
            });

            string querycb = "SELECT DISTINCT fileType FROM LogsTable"; //COMBOBOXA DATA ÇEKMEK
            SqlCommand cmdcb = new SqlCommand(querycb, con); //COMBOBOXA DATA ÇEKMEK
            SqlDataReader drcb = cmdcb.ExecuteReader(); //COMBOBOXA DATA ÇEKMEK
            List<string> list = new List<string>(); //COMBOBOXA DATA ÇEKMEK
            list.Add(""); //COMBOBOXA DATA ÇEKMEK

            while (drcb.Read())
            {
                list.Add(drcb["fileType"].ToString());
            }

            drcb.Close();

            comboBox1.DataSource = list; //COMBOBOXA DATA ÇEKMEK
            con.Close();

            filldata();
        }
    }
}    

我无法解决这个问题，我不想 go 回到常规

Answer 1

在性能方面，我建议使用sqlbulkcopy只需用所有行填充 DataTable 并一次插入，它比对文件中的每一行进行单个查询要快得多，这可能真的很长。

    public static void BulkInsert(IEnumerable<string> lines)
    {
        DataTable dt = new DataTable();
        dt.TableName = "LogsTable";
        
        dt.Columns.Add("timestampof_log");
        dt.Columns.Add("atmID");
        dt.Columns.Add("fileType");
        dt.Columns.Add("eventText");

        foreach (var line in lines)
        {
            string timeStmp = line.Split('\t')[0];
            string atmIdd = line.Split('\t')[1];
            string fileTyp = "JournalLog";
            string evenTex = line.Split('\t')[2];

            dt.Rows.Add(timeStmp, atmIdd, fileTyp, evenTex);

        }

        BulkInsert(dt);
    }

    public static void BulkInsert(DataTable table)
    {
        using (var bulkInsert = new SqlBulkCopy(ConnectionString))
        {
            bulkInsert.DestinationTableName = table.TableName;
            bulkInsert.WriteToServer(table);
        }
    }

Answer 2

最简单的方法 - 在每个并行线程中打开 sql 连接。

Parallel.Foreach SQL 查询有时会导致 Connection more detail here