MS Access 2007/2010 Attachment Field Retrieval And Storage
Dec 16, 2011
I'm opening this discussion up primarily because I felt that it was inappropriate that Samir Ibrahim and I had hijacked another thread by turning it into a collaborative development thread. This thread will also hopefully serve as a searchable reference for those few who actually make an attempt to search the forum for information before posting a question. For reference the original thread I mentioned is [URL]
This thread is meant to be a repository for our continued collaboration on trying to find a way to update the attachment field using the OLEDB class. Samir believes that he is close to cracking the secret code.:)
Attachment retrieval and updating is a fairly trivial task using the Microsoft Access Database Engine. It is also fairly trival to retrieve the attached files using OLEDb as well. The difficulty comes when trying to add or delete an attachment with OLEDB.
The attachment field is actually a record set where each record consists of six fields. One of these fields is the data field that contains the binary file data. According to the documentation, Access will compress certain file. It appears that compression/decompression is handled behind the scenes so to say and what you are present with is sequence of bytes. The data field consists of sequence of header bytes followed by the actual data. The first four bytes define an offset to the start of the data. One thing that we are trying to determine is the meaning of other bytes in the header.
I have uploaded a sample project at: [URL]
This project is by no means a finished product. It is hard code to retrieve the first record from the included Access database.
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Oct 6, 2011
I am working on an asp.net project in VS2010 using vb.NET (not VBA) designing an interface to allow a user to upload a file to an access 2007 table attachment field. My understanding is that in order to interface with a table with an attachment field you
must use DAO to connect to the database so that you can expose the attachment field properties. When I try to open the DAO recordset I am getting "COM exception was unhandled by user code" with a message stating "Too few parameters. Expected 3". The error code is -2146825227 and the stacktrace message is "at dao.Database.OpenRecordset(String Name, Object Type, Object Options, Object LockEdit)"
[Code]...
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Sep 23, 2010
i have create a software for my college which is document management. well am doing good so far up to now where i need to upgrade my database what i mean ?
in case i need to make any changes to my database i don't want to enter the database and create new table or add new fields to existing table to my current database,i would like to do that throught visual studio 2010 programaticaly. something like an additional application where i will choose my database path and the application will upgrade the database with new tables or new fields .
i would like also to ask, in order to create database,or if you already have the database and you like to just open the connection to it programaticaly and add new field ,or relate some table ,you have to work with different librarys? Like ADOX,DAO etc ? and other.?
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Jan 29, 2012
I'm trying to create a database of all the Magic The Gathering cards I have in inventory and I'd like to have a picture preview of the card in my program. In access I've created a table and for each row I've attached an image of the card. Now I can't get the image to display in Visual Studio. The picture type is the correct format and databindings are all correct. I just can't seem to get the picture to preview as I go down the list in my datagrid.So far I haven't written any code. I've built the application in design view just dragging items from my data sources window.
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Jan 31, 2012
I'm having a problem that I've spent all day researching to try and figure out. It seems that the 'Attachment' type in an Access 2007 DB file is stored as three seperate pieces of data in the one field. If you open up the Relationships view, you can see it in the table itself.
I'm trying to do a simple DVD movie database to keep track of everything I have, and who I've loaned things out to. I'm doing this in part to further my education in VB.NET and to figure out some of the things involved with interacting with databases. I haven't actually written any code yet, read on and you'll understand what's going on.
I've got an Attachment field setup in the database to hold a picture of the movie poster or DVD cover art or something like that to help identify the film, and I named it 'Art' of type 'Attachment' since that will hold an image. Looking at the table in Access I see that 'Art' is broken down into three entries: Art.FileData, Art.FileName, Art.FileType. I'd like to be able to pull the filename and file type and display those on the form, but we'll get to that later.
When I use a drag-n-drop gridview of the database into my blank VB form, the Art field just shows the filename, in my case it's 'screenshot.png' since I just dumped a screen shot in as a test. So, the gridview on the form will see the field and display the filename, which is fine. If I do another Windows form and drag-n-drop a Details View (instead of the grid view), and have the Art field in the table set to a PictureBox (in the Data Sources view, you can highlight a field and then designate it as text or picture
or date or whatever), I end up with a blank box instead of my image.
I haven't typed any code into any of the forms at this point. I'm still in the Designer trying to get the layout and stuff the way I want it, afterwhich I'll start adding buttons and methods and such to search for things, print out a nice list of the films in the database (with and without pictures) and be able to sort out a list of who I've loaned things to (like an overdue book list). But so far, by just dragging and dropping from the Data Sources into the form, Studio automatically creates the dataset and bindings and such to read from the database file, and I can see all of my test data *except* for the image in the PictureBox (it's just blank/empty).
So, if you want to see what's happening and sort this out, then you need to do the following:
1. Create an access database with a table, that table having at least one field of type 'Attachment'
2. put a picture/image into that field as a first entry
3. in Studio (or in my case Express), create a new project, which'll have a blank form in it by default
4. create your database connection by using the 'Add new data source...' wizard for your Access DB file
5. from the Data Sources, expand the table views and change the attachemnt field from the default of TextBox to a PictureBox (you may have to Customize the types to get PictureBox to show up)
6. drag and drop that whole table onto your form, which will automatically create form elements to display the data and stuff
7. Run it, you'll see the problem.
I have no idea what I need to look at or edit or change to get this PictureBox to display the image from the database. Like I said before, if I leave the type set to the default of TextBox in the Data Sources view, then the field will display the filename of the file stored in that field of the database. Having not typed any code yet, I have nothing that I've done that I can edit other than the automatically created stuff that Studio did when I dragged the table into the form.
Being completely unfamiliar with how VB.NET wants to talk to a database (SQL server, Access or otherwise) I decided to create this little program to learn how to do it. But I ran into this problem and need a little help. What I'm looking for is what I need to change in the bindingSource or TableAdapter or TableAdapterManager or BindingsNavigator or whatever resource is binding the fields on the form to the entries in the database so that the PictureBox will get the part of my 'Art' field that actually
holds the image, not the filename or the type. I don't know how to do that, and that's what I'm trying to learn. What I would like to know is how to both get the image to display in the PicutreBox and pull the filename for that image as well to display beneath it or something in the form.
And before someone starts complaining about writing the whole program for me, I must say this is one element of a large personal project and if you read my entire post here you'll see that there are many other elements that will eventually go with it. I just need some help getting this one thing to work. Multiple web searches and such point to a variety of different approaches, many of
which I've tried to implement but nothing has worked. I'd like to do this entirely in .NET with no other dependencies if at all possible, but some of what I've seen so far today suggests using Interop and other things to make this work, but those haven't panned out for me either as of yet. My ultimate goal with this whole program is to have one (albeit probably large) executable file that will encompass the entire program, and to have it all work. After that, then I'll look into things like creating my own modules
and DLL's and such to thin it out, but I'm not even close to that point yet.
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Dec 3, 2010
i use Ms Access 2010 DB as Backend and Programing using VB.NET COdeNarmada
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Mar 25, 2011
How to add values from field ( Access 2007 ) to a combobox in visual basic 2008?
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Oct 8, 2010
How does one connect to an MS-Access 2007 mdf? Need coding example for VB2010.
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Nov 28, 2011
I've got a question about attachment field (as OLE object/attachment) in Access Database and Visual Basic 2010. I would like to know, is there a possibility to use attachment field in the same way, in VB like in Access Database? What I want to do, is to make an application (connected to Access Database) for users from my company, that will allow them to open "Registration Form" and fill all required fields, and also add PowerPoint Presentation as attachment.
What is most important, I would like to have an access to this presentation.
Project Path:
Employee opens Application/Window Form --> Fill all required fields + attachment field --> I have access to the presentation from Access Database/or another Window Form (I can Open/Edit/Change the presentation)
So, what I would like to have - Window Form with attachment as icon, but after upload (by employee/other person) it has to be in the database.
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Nov 23, 2011
I have a file accdb with password, now, i want to connect it and a project in VB 2010
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Jan 13, 2012
I want to know how connect ms access 2007 with vb.net? and what is code for it?
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Jan 16, 2010
Been trying to solve this for the past few days It's doing my head in I have just moved from a legacy version of VB to VS 2010. I'm happy with SQL statements.I have placed a DataGridView on a form and it impressively sets up a grid view of the data. Now I want to provide a txtSearch texbox and a btnFind button to filter the records by the search string entered into txtSearch.In the good old days you would create an SQL satement and refresh the DataSource property of the data control and all would be well - easy, quick and effective.
In this new environment I am totally lost = simply don't know how to refresh the DataGridView with records resulting from a dynamically generated SQL statement - and I don't want to use stored procedures at the moment (using Access).So, from the Click even of btnFind I can create the SQL statement but how do I implement it
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Mar 2, 2011
I'm trying to create an application using VB 2010 and an MS Access 2007 database. I've been googling around but was unable to find something focused on this matter.
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Oct 14, 2011
I am trying to do an insert into an Access 2007 DB but keep getting a syntax error even thougt I can get the generated query and run it in Access and successfully add to the table.
Code....
Private
Sub
ButCommit_Click(ByVal
[code]....
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Oct 15, 2011
Been reluctant to drop this on anyone as I wanted to resolve it myself but alas it has got the better of me. I am trying to do an insert into an Access 2007 DB but keep getting a syntax error even thougt I can get the generated query and run it in Access and successfully add to the table.
PrivateSub ButCommit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButCommit.Click
con.Open()
[Code]......
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Mar 28, 2011
I am working in Windows 7 Home Premium using MS-Visual Basic 2010 Express. I am having difficulty connecting to an Access 2007 database using ADO. When I try to connect to the database I get the following error:
Error Code: -2147467259
Exception: [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application
Source: Microsoft OLE DB Provider for ODBC Drivers
I looked at...
[URL]
There were several reference to compiling the program using x86.
Go to Project menu -> Properties -> Compile tab -> Select "Advanced Compile Options" -> Select "x86" instead of "AnyCPU"
I followed the path and there was not any option to select x86 in VB 2010 Express.
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Dec 30, 2011
In the past I've used this code to create a database at runtime :-
Dim Cat As New Catalog
Dim Cn As New ADODB.Connection
Dim objTable As New ADOX.Table
[code].....
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Jan 11, 2011
I have built an Access 2007 database with some data stored in it. I have managed to export data using VB2008 from that database to Excel 2007 and have it automatically draw charts based on this data and a query in the Visual Basic Code. One of the results looks like this:
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Aug 23, 2011
upgrade my DAO code to ADO? The following code worked fine in VB.Net for Interop Access 2007.
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Aug 30, 2011
I would like to know if there a way to Compact and Repair an Access 2007 Database Programmatically Using VB 2010?
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Feb 15, 2012
How to refresh data gridview of an Access 2007 database using Visual Basic 2010?
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Apr 4, 2011
I keep getting an "Syntax error in Insert Into Statement." error message when trying to save an image to my Access database.
Imports System.IO
Imports System.Data.OleDb
Imports System.Drawing
[code]....
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Jul 29, 2011
I want to show pictures on a PictureBox. Pictures are stored on an accdb database's field (that field's type is "attachment"). Below you can find more details.
i have an access 2007 database (accdb), it has only one table named "TbResimler".
In that table, i have these fields;
Field Name Data Type Description[code]...
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Jun 21, 2011
I am not able to add records in an Access 2007 database using VB 2010 Express Edition. I have read other posts and followed them but still I am not sucessful. I have the connection to the access database as MS Access Database, therefore it has the OLEDB connection (not the Jet 4.0). I am using the project instance in binding the text boxes to the fieldnames in the Access database. Did I miss something? I am also using Windows Vista Ultimate.
Below is the code.
Private
Sub
cmd_Save_Click(ByVal
sender As
[code]....
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Jan 2, 2012
The project must have different user and each has username and password will be saved in my database but only the admin can add users.
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Dec 14, 2011
I am trying to learn how I can enter data into a Microsoft Visual Basic 2010 TextBox on a form and when I Tab to the next TextBox, the data from the first TextBox is automatically appended to a Microsoft Access 2007 table. For this question, no other controls or objects are necessary.
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Jun 13, 2011
If I create a windows app which I link to an MS Access databse file that already exists..will I need to have MS Office installed on every computer at which I want to use the app? If not then how do I go about making a standalone windows app that will store information in a database of some form or another ?
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Oct 9, 2009
Connecting VB with Excel 2007 & Access 2007?
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Nov 22, 2010
I'm new to visual basic 2010 ultimate. I want to make a search button to "search" ms access 2007 database for specific data and display the results in datagridview. I also want to display the data to textboxes.
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Feb 8, 2011
Iv just started using a winsock control in VS 2010.
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
sckListen.Listen()
sckConnect.Connect(sckListen.LocalIP, sckListen.LocalPort)
[code]....
On data retrieval, it comes out as number instead of text. Im guessing ASCII?Why is it doing this? Do I need to convert each ASCII number into a character?
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