syntax error at or near pgsl?

Question

I am developing an asp.net web application and I would like to import a fichier excel to postgresql. I'm using this code but it gives me this error. Can you help me? Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1056: Unexpected character '$'

Line 74: quer = "INSERT INTO poi (num_route, pk, geom) select num_route,pk_debut from [Sheet1$]"; Line 75: NpgsqlCommand cm = new NpgsqlCommand(quer, cnx); L ine 76: reader = cm.ExecuteReader();

using System;
using System.Configuration;
using System.IO;
using System.Data;
using System.Drawing;
using System.Data.OleDb;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections;
using System.Text;
using System.Xml;
using Npgsql;
using System.Collections.Specialized;
using System.Collections.Generic;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        lblMessage.Text = "Please select an excel file first";
        lblMessage.Visible = false;
    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        if ((txtFilePath.HasFile))
        {
            
            OleDbConnection conn = new OleDbConnection();
            OleDbCommand cmd = new OleDbCommand();
            OleDbDataAdapter da = new OleDbDataAdapter();
            DataSet ds = new DataSet();
            string query = null;
            string quer = null;
            string connString = "";
            string strFileName = DateTime.Now.ToString("ddMMyyyy_HHmmss");
            string strFileType = System.IO.Path.GetExtension(txtFilePath.FileName).ToString().ToLower();

            //Check file type
            if (strFileType == ".xls" || strFileType == ".xlsx")
            {
                txtFilePath.SaveAs(Server.MapPath("~/UploadedExcel/" + strFileName + strFileType));
            }
            else
            {
                lblMessage.Text = "Seuls les fichiers Excel autorisés";
                lblMessage.ForeColor = System.Drawing.Color.Red;
                lblMessage.Visible = true;
                return;
            }

            string strNewPath = Server.MapPath("~/UploadedExcel/" + strFileName + strFileType);

            //Connection String to Excel Workbook
            if (strFileType.Trim() == ".xls")
            {
                connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
            }
            else if (strFileType.Trim() == ".xlsx")
            {
                connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
            }


            query = "SELECT num_route,pk_debut,pk_fin FROM [Sheet1$]";
            NpgsqlConnection cnx = new NpgsqlConnection("Server=localhost;Port=5432;User Id=postgres;Password=*****;Database=****;");
            NpgsqlDataReader reader;
            cnx.Open();
            quer = "INSERT INTO poi (num_route, pk) select num_route,pk_debut from "Sheet1$"";
            NpgsqlCommand cm = new NpgsqlCommand(quer, cnx);
            reader = cm.ExecuteReader();
        
            //Create the connection object
            conn = new OleDbConnection(connString);
            //Open connection
            if (conn.State == ConnectionState.Closed) conn.Open();
            //Create the command object
            cmd = new OleDbCommand(query, conn);
            da = new OleDbDataAdapter(cmd);
            ds = new DataSet();
            da.Fill(ds);

            grvExcelData.DataSource = ds.Tables[0];
            grvExcelData.DataBind();

            lblMessage.Text = "Les données récupérées avec succès! Total de lignes:" + ds.Tables[0].Rows.Count;
            lblMessage.ForeColor = System.Drawing.Color.Green;
            lblMessage.Visible = true;

            da.Dispose();
            conn.Close();
            conn.Dispose();
        }
        else
        {
            lblMessage.Text = "S'il vous plaît sélectionner un fichier excel";
            lblMessage.ForeColor = System.Drawing.Color.Red;
            lblMessage.Visible = true;
        }
    }
}

Answer 1

I would suggest trying something like this

        //Connection String to Excel Workbook
        if (strFileType.Trim() == ".xls")
        {
            connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
        }
        else if (strFileType.Trim() == ".xlsx")
        {
            connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
        }

        var Builder = new StringBuilder("INSERT INTO poi (num_route, pk) select num_route,pk_debut VALUES ");

        bool first = true;
        using (var conn = new OleDbConnection(connString))
        {
            if (conn.State == ConnectionState.Closed) conn.Open();
            using (var cmd = new OleDbCommand("SELECT num_route,pk_debut,pk_fin FROM [Sheet1$]", conn))
            using (var da = cmd.ExecuteReader())
            {
                while (da.Read())
                {
                    if (!first) Builder.Append(",");
                    Builder.Append("(");
                    Console.WriteLine(da[0]);
                    Builder.Append(",");
                    Console.WriteLine(da[1]);
                    Builder.Append(",");
                    Console.WriteLine(da[2]);
                    Builder.Append(")");
                    first = false;
                }
            }
        }

        using (NpgsqlConnection cnx = new NpgsqlConnection("Server=localhost;Port=5432;User Id=postgres;Password=*****;Database=****;"))
        {
            cnx.Open();
            var quer = Builder.ToString();
            using (NpgsqlCommand cm = new NpgsqlCommand(quer, cnx))
                cm.ExecuteNonQuery();
        }