C# Import Excel Data into Existing MDB Database - excel

Question

I have an Access MDB File with just one table simply called "Sheet1". Inside Sheet1 I already have the Fields Identified, but I left the table empty of any records.
I'm trying to copy data from a CSV file into the Access Sheet1 table.
The code below works if the table does not already exist, but I get an error at the AccessCommand.ExecuteNonQuery(); line that says
System.Data.OleDb.OleDbException: Table 'Sheet1' already exists.
How do I revise this code so that I can import the CSV data into an empty Table with Fields already identified?
using System.Data.OleDb;
string filename = "MyCSV.csv";
int result = 0;
string dirPath = AppDomain.CurrentDomain.BaseDirectory + "DataBase\\";
string uploaderMDB = dirPath + "MyMDB.mdb";
OleDbConnection AccessConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + uploaderMDB);
AccessConnection.Open();
OleDbCommand AccessCommand = new OleDbCommand("SELECT * INTO [Sheet1] FROM [Text;FMT=Delimited;DATABASE=" + dirPath + ";HDR=No].[" + filename + "]", AccessConnection);
AccessCommand.ExecuteNonQuery();
AccessConnection.Close();

Answer 1

Try it this way.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
OleDbConnection conn;
conn = new OleDbConnection(#"Provider=Microsoft.Jet.OleDb.4.0;Data Source=C:\your_path_here\Northwind.mdb");
conn.Open();
OleDbCommand cmd = conn.CreateCommand();
cmd.CommandText = #"INSERT INTO MyExcelTable([Fname], [Lname], [Address])VALUES('" + textBox1.Text + "', '" + textBox2.Text + "','" + textBox3.Text + "')";
cmd.ExecuteNonQuery();
conn.Close();
}
public OleDbConnection myCon { get; set; }
private void button2_Click(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Ryan\Desktop\Coding\Microsoft Access\Northwind.mdb";
string fstName = textBox1.Text.Trim();
string lstName = textBox2.Text.Trim();
string adres = textBox3.Text.Trim();
OleDbCommand cmd = new OleDbCommand(#"INSERT INTO MyExcelTable (FName, LName, Address) VALUES (#FName, #LName, #Address)")
{
Connection = conn
};
conn.Open();
if (conn.State == ConnectionState.Open)
{
// you should always use parameterized queries to avoid SQL Injection
cmd.Parameters.Add("#FName", OleDbType.VarChar).Value = fstName;
cmd.Parameters.Add("#LName", OleDbType.VarChar).Value = lstName;
cmd.Parameters.Add("#Address", OleDbType.VarChar).Value = adres;
try
{
cmd.ExecuteNonQuery();
MessageBox.Show(#"Data Added");
conn.Close();
}
catch (OleDbException ex)
{
MessageBox.Show(ex.Source + "\n" + ex.Message);
conn.Close();
}
}
else
{
MessageBox.Show(#"Connection Failed");
}
}
}
}

Answer 2

I found a solution (it requires XLSX instead though...) for anyone interested. It uses the
Microsoft.Office.Interop.Access reference instead of OleDb.
string filename = "MyXLSX.xlsx";
string dirPath = AppDomain.CurrentDomain.BaseDirectory + "DataBase\\";
string uploaderMDB = dirPath + "MyMDB.mdb";
string fullPath = dirPath + filename;
Application _accessData = new ApplicationClass();
_accessData.Visible = false;
_accessData.OpenCurrentDatabase(uploaderMDB);
_accessData.DoCmd.OpenTable("SHEET1");
_accessData.DoCmd.TransferSpreadsheet(AcDataTransferType.acImport, AcSpreadSheetType.acSpreadsheetTypeExcel12, "Sheet1", fullPath, true, "MY_NAMED_RANGE");
_accessData.CloseCurrentDatabase();
_accessData.Visible = true;
_accessData.Quit(AcQuitOption.acQuitSaveAll);
System.Runtime.InteropServices.Marshal.ReleaseComObject(_accessData);
_accessData = null;