将csv文件导入数据库 [英] import csv file into database

问题描述

我正在将exel文件导入数据库但出错了参数化查询'（@ OrderID int，@ CustomerName varchar（20），@ Address varchar（50），@ Em'需要参数'@OrderID'，这不是提供。

i am importing exel file into database but giving error The parameterized query '(@OrderID int,@CustomerName varchar(20),@Address varchar(50),@Em' expects the parameter '@OrderID', which was not supplied.

DataTable dt = new DataTable();
        dt.Columns.Add("OrderID");
        dt.Columns.Add("CustomerName");
        dt.Columns.Add("Address");
        dt.Columns.Add("Email");
        dt.Columns.Add("Total");
        string path = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
        FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Imported file/" + path));
        path = Server.MapPath("~/Imported file/" + path);
        TextFieldParser txtp = new TextFieldParser(path);
        txtp.Delimiters = new string[] { "," };
        txtp.TrimWhiteSpace = true;
        
        while (!txtp.EndOfData)
        {
            string[] fields = txtp.ReadFields();
            dt.Rows.Add(fields.Equals("OrderID"));
            dt.Rows.Add(fields.Equals("CustomerName"));
            dt.Rows.Add(fields.Equals("Address"));
            dt.Rows.Add(fields.Equals("Email"));
            dt.Rows.Add(fields.Equals("Total"));

        }

        con = Connectivity.GetConnection();
        string import = "Insert into Customer (OrderID,CustomerName,Address,Email,Total) values(@OrderID,@CustomerName,@Address,@Email,@Total)";
        SqlCommand cmd = new SqlCommand(import, con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);

        //cmd.Parameters.AddWithValue("@OrderID", "OrderID");
        //cmd.Parameters.AddWithValue("@CustomerName","CustomerName");
        //cmd.Parameters.AddWithValue("@Address",  "Address");
        //cmd.Parameters.AddWithValue("@Email",  "Email");
        //cmd.Parameters.AddWithValue("@Total", "Total");

        //SqlCommand cmd = new SqlCommand();
        //cmd.CommandType = CommandType.Text;
        //cmd.CommandText = import;
        //cmd.Connection = con;

        cmd.Parameters.Clear();
        cmd.Parameters.Add("@OrderID", SqlDbType.Int);
        cmd.Parameters.Add("@CustomerName", SqlDbType.VarChar, 20, "CustomerName");
        cmd.Parameters.Add("@Address", SqlDbType.VarChar, 50, "Address");
        cmd.Parameters.Add("@Email", SqlDbType.VarChar, 50, "Email");
        cmd.Parameters.Add("@Total", SqlDbType.Float);
        // SqlDataAdapter da = new SqlDataAdapter();
        cmd.ExecuteNonQuery();
        // da.InsertCommand = cmd;
        int result = da.Update(dt);

推荐答案

我不需要阅读你的代码，我只需要读取错误。它意味着它所说的。事实上，你所有的参数都没有给出值，所以都会失败。



批量插入是一次导入整个csv的方法。或者你可以阅读我关于将一组数据传递给SQL Server的文章。

I don't need to read your code, I just need to read the error. It means what it says. In fact, all your parameters have not been given values, and so will all fail.

Bulk insert is the way to import an entire csv in one go. Or you could read my articles on passing abitrary sets of data to SQL Server.

你只提供了DataType。您还需要提供这些值。



因此，请参阅SqlParameterCollection.Add Method（String，SqlDbType） [ ^ ]， SqlParameterCollection.Add方法（字符串，SqlDbType，Int32） [ ^ ]和 SqlParameterCollection.Add方法（String，SqlDbType，Int32，String） [ ^ ]。

You have only provided the DataType. You need to provide the values as well.

So, refer examples at SqlParameterCollection.Add Method (String, SqlDbType)[^], SqlParameterCollection.Add Method (String, SqlDbType, Int32)[^] and SqlParameterCollection.Add Method (String, SqlDbType, Int32, String)[^].

试试这个

Try this

while (!txtp.EndOfData)
        {
            string[] fields = txtp.ReadFields();
            var newRow = dt.NewRow();
            newRow.ItemArray = fields;
            dt.Rows.Add(newRow);

        }

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