MySQL - Bulk data import using .Net connector MySqlBulkLoader Class

Lets see how do we import bulk data in MySQL database? To deal with MySQL database we first need MySQL to .Net connector, which can be downloaded from here. When you install this connector, it will give you DLLs required to deal with MySQL database from .Net code.

Reference MySql.Data.dll in your .Net project, we'll be using MySqlBulkLoader class to import bulk data. However this class doesn't provide any direct way to load DataTable into database, but it provides way to bulk load .csv file.

1. Function to create .csv file from DataTable (you can skip this, if you already have csv file)

public static void CreateCSVfile(DataTable dtable, string strFilePath)

{

    StreamWriter sw = new StreamWriter(strFilePath, false);

    int icolcount = dtable.Columns.Count;

    foreach (DataRow drow in dtable.Rows)

    {

    for (int i = 0; i < icolcount; i++)

    {

        if (!Convert.IsDBNull(drow[i]))

        {

        sw.Write(drow[i].ToString());

        }

        if (i < icolcount - 1)

        {

        sw.Write(",");

        }

    }

    sw.Write(sw.NewLine);

    }

    sw.Close();

    sw.Dispose();

}

2. Import data into MySQL database

private void ImportMySQL()

{

    DataTable orderDetail = new DataTable("ItemDetail");

    DataColumn c = new DataColumn();        // always

    orderDetail.Columns.Add(new DataColumn("ID", Type.GetType("System.Int32")));

    orderDetail.Columns.Add(new DataColumn("value", Type.GetType("System.Int32")));

    orderDetail.Columns.Add(new DataColumn("length", Type.GetType("System.Int32")));

    orderDetail.Columns.Add(new DataColumn("breadth", Type.GetType("System.Int32")));

    orderDetail.Columns.Add(new DataColumn("total", Type.GetType("System.Decimal")));

    orderDetail.Columns["total"].Expression = "value/(length*breadth)";

 

    //Adding dummy entries

    DataRow dr = orderDetail.NewRow();

    dr["ID"] = 1;

    dr["value"] = 50;

    dr["length"] = 5;

    dr["breadth"] = 8;

    orderDetail.Rows.Add(dr);

 

    dr = orderDetail.NewRow();

    dr["ID"] = 2;

    dr["value"] = 60;

    dr["length"] = 15;

    dr["breadth"] = 18;

    orderDetail.Rows.Add(dr);

    //Adding dummy entries

 

    string connectMySQL = "Server=localhost;Database=test;Uid=username;Pwd=password;";

    string strFile = "/TempFolder/MySQL" + DateTime.Now.Ticks.ToString() + ".csv";

 

    //Create directory if not exist... Make sure directory has required rights..

    if (!Directory.Exists(Server.MapPath("~/TempFolder/")))

    Directory.CreateDirectory(Server.MapPath("~/TempFolder/"));

 

    //If file does not exist then create it and right data into it..

    if (!File.Exists(Server.MapPath(strFile)))

    {

    FileStream fs = new FileStream(Server.MapPath(strFile), FileMode.Create, FileAccess.Write);

    fs.Close();

    fs.Dispose();

    }

 

    //Generate csv file from where data read

    CreateCSVfile(orderDetail, Server.MapPath(strFile));

    using (MySqlConnection cn1 = new MySqlConnection(connectMySQL))

    {

    cn1.Open();

    MySqlBulkLoader bcp1 = new MySqlBulkLoader(cn1);

    bcp1.TableName = "productorder"; //Create ProductOrder table into MYSQL database...

    bcp1.FieldTerminator = ",";

 

    bcp1.LineTerminator = "\r\n";

    bcp1.FileName = Server.MapPath(strFile);

    bcp1.NumberOfLinesToSkip = 0;

    bcp1.Load();

 

    //Once data write into db then delete file..

    try

    {

        File.Delete(Server.MapPath(strFile));

    }

    catch (Exception ex)

    {

        string str = ex.Message;

    }

    }

}