As you have discovered, you cannot use a SQL statement to insert files into an Attachment
field in an Access database. You have to use the LoadFromFile()
method of an ACE DAO Field2
object. The following C# code works for me. It is adapted from the Office Blog entry here.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Access.Dao;
namespace daoConsoleApp
{
class Program
{
static void Main(string[] args)
{
// This code requires the following COM reference in your project:
//
// Microsoft Office 14.0 Access Database Engine Object Library
//
var dbe = new DBEngine();
Database db = dbe.OpenDatabase(@"C:\__tmp\testData.accdb");
try
{
Recordset rstMain = db.OpenRecordset(
"SELECT refId, img FROM Logo WHERE refId = 1",
RecordsetTypeEnum.dbOpenDynaset);
if (rstMain.EOF)
{
// record does not already exist in [Logo] table, so add it
rstMain.AddNew();
rstMain.Fields["refId"].Value = 1;
}
else
{
rstMain.Edit();
}
// retrieve Recordset2 object for (potentially multi-valued) [img] field
// of the current record in rstMain
Recordset2 rstAttach = rstMain.Fields["img"].Value;
rstAttach.AddNew();
Field2 fldAttach =
(Field2)rstAttach.Fields["FileData"];
fldAttach.LoadFromFile(@"C:\__tmp\testImage.jpg");
rstAttach.Update();
rstAttach.Close();
rstMain.Update();
rstMain.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
}
}