I have multiple documents stored in Attachment data type in Access database. UsingDataReader, I need to read multiple attachments along with their file name and store them on the file system
View 1 RepliesI am experiencing an error. I have a microsoft sql server database and need to colelct the data from the results and get the nullreference error shown below. I check the SQL string and executed it directly in the database and it yielded the correct results.
Quote: Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. I use this code for connecting and reading the DB:
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I have an error ERROR [22018] [Microsoft][ODBC Microsoft Access Driver] Data type mismatch in criteria expression. and I've been trying to solve this but unfortunately I couldn't get the hack of this error. I'm a newbie in dotNet.
Public Sub LogInContinue(ByVal senter As Object, ByVal e As EventArgs)
Dim LibDS As DataSet = New DataSet
Dim LibDA As OdbcDataAdapter = New OdbcDataAdapter("SELECT * FROM tblUserAccount WHERE Uname='" & txtUserName.Text & "'", LibConn)
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We are working on an ASP.Net/VB.Net application using Enterprise Library for our data access (DAAB).
We are trying to store DateTime values in an Oracle Date field. However, the precision is being lost. Currently only the year, month, and date are being stored. We need better precision than this.
Oracle Dates are supposed to "includes not just the month, day, and year, but also
the hour, minute, and second. "
I have an error "ERROR [22018] [Microsoft][ODBC Microsoft Access Driver] Data type mismatch in criteria expression". I am using VBdotNet2005 and MS Access as its database, and I can't really get the hang of this error.
View 8 RepliesI am currently working a piece of code which needs to send an attachment in the
email it generates. The attachment is a PDF document. Due to requirements I am
unable to save the PDF and send it, so I have had to create a memory stream attachment.
The issue I have with this is that the file size is _500KB. However save the file on my machine and it is around 370KB.
This increase in file size is unacceptable. has anyone come across this issue before? If so how have they got round the problem.
Below is the section of code.
Dim memStream As System.IO.MemoryStream = Nothing
'assign number to the PDF name
Dim filename As String = req.GetAccountNumber()
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I have an email account. I need to write some code that looks for any new email message on it and in case there is, it saves the attachment in a particular destination.
View 5 RepliesI'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.
i use Ms Access 2010 DB as Backend and Programing using VB.NET COdeNarmada
View 1 Replieswhere I want to use the Select All and Deselect All CheckBox. There is no Visual Studio installed there. They want everything in Access. Visual Basic is not installed, it is within the Access interface. Is there a way I can use VB code to have a Select All and Deselect All option. I dont want any code. Just want to know if it is possib
View 1 RepliesCan I read the mail and download the attachments using that imaplibrary in VB.Net
View 1 RepliesI'v designed a ms access database table with one field having Datetime datatype. I can Insert data into it from vb.net front end by trns_dt DateTime.Now.DateBut when I fetch records from the tableand assign the dataset datasource as da, it shows datatype mismatch error.
daleDbDataAdapter("SelectDaily_Transactiondtp_from_dt.value dtp_To.value con)
dsDataSet
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Error msg - Namespace or type 'Data' for the Imports 'Microsoft.ApplicationBlocks.Data' can't be found. How do I fix this error. I tried adding a reference but it is not listed in the references.
View 2 Replieshow to connect to a database and retrive data in a table using oledb data provider in Microsoft access?
View 2 RepliesI am trying to select Multiple files and then read the file 1 by 1, i want to know how to specify the file number in Visual Basic .net 2008
Here is a sample code which i have used in reading the text file.
With dlgOpen
.Filter = "txt Files (*.txt)|*.txt"
.Title = "Open Text Files"
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Actually my text file is a dump file and i need to make a program to process this dump file. I may ask some stupid questions but this is just a beginning, i want to parse INDIVIDUAL text file line by line. In the above code i have used the ReadToEnd function in order to display it in TextBox but i may use ReadLine Function or Read function to read line by line or characters respectively.
I have attached an Access Database with the predefined tables in it, I want to update the contents in Access Database. Supposingly if my textfile contains Names (Sam,Julie,Joseph,Marina), how will i update my attached Access table in vertical order !
I am using the following code to send an email with attachments. I can send one attachment but how can I send multiple attachments?
Dim vrAttachFilePath As String = "c:usersittahaddocumentsabc.doc"
If vrAttachFilePath.Length > 0 Then
oMail.Attachments.Add(New Net.Mail.Attachment(vrAttachFilePath))
End If
I try to create a funtion to return a datareader from CSV file as below but got a error said that
ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified(at cn.open())
Public Shared Function GetCSVAsDataReader(ByVal csvPath As String) As Odbc.OdbcDataReader
Dim fi As New FileInfo(csvPath)
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Remove a record from a Access database using a VB?I have created a small database in Access,then using VB 2008 Express Edition, created a link between Vb form and Access When I try and Add then Save a record, the information is not in the database.But I can't remember how to:-*Add a record*Save the record*Edit an existing record*Find a record in the databas of interest, is it possible for the add button to be clicked when the VB form loads, and if so how do I achieve this
View 2 RepliesThe backend uses Microsoft SQL Server 2000 runtime engine with an MSDE database engine. The frontend however is built with Microsoft VB.Net and the dotnet framework. I'm not sure how this changes things when trying to extract the tables. I've found the folders where SQL-notepad looking files are contained but am not sure what my next step should be. TBH i dont know what version of Microsoft VB.Net framework is used but the system is quite old and was made in 2001. If you haven't noticed from my poor phrasing i'm a bit of a newb when it comes to programming. If there is a particular programming code i have to put in i wouldn't really know where to put it.
View 3 Repliesi've started work at this small charity and they need me to extract the tables and data from an old buggy system and create a new Access system but i'm having trouble extractig the data.The backend uses Microsoft SQL Server 2000 runtime engine with an MSDE database engine. The frontend however is built with Microsoft VB.Net and the dotnet framework. I'm not sure how this changes things when trying to extract the tables. I've found the folders where SQL-notepad looking files are contained but am not sure what my next step should be. TBH i dont know what version of Microsoft VB.Net framework is used but the system is quite old and was made in 2001.
View 2 RepliesI'm trying to read data in Visual Studio from multiple tables. How do you read data from different tables? Do I have to create
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Is there a need to explicitly close the connection in this Microsoft Data Access Application Block for .NET? i am encountering timeout expired pooling errors in the sql server 2000. I am wondering if the unclosed connection is the problem
View 2 RepliesWe are using Exchange 2003 as part of sbs 2003 premium.
We have a distribution group abc which receives emails abc@mydomian.com. How can I access emails coming to this distribution group and extract any PDF attachments that may be present using vb.net code?
I'm writing a program to work with access and one of the columns is an attachment data type. I was trying to use a INSERT INTO statement however it errors and tells me that INSERT can't be used for a multivalue field. Makes sense since an attachment type will allow for multiple files however I'm stumped how to make this work. Anyone run into this and if so what's the resolve? Is there a way to make .net make this happen programmatically? The only other thing I can think to do is save the file path or copy the file to another specified location and then save that file's path. To me that's not a good workaround and I'd like to use Access for what it can do.
View 4 Replies[Code]...
I have Memberships and Bookings tables in database containing an attribute cust_id which is primary key in Memberships and reference key in Bookings. When i am executing data reader I want it to read cust_id values from membership table but it is reading it from the bookings table.....
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I am using the publish wizard in VB 2010 Professional for deployment as I tried the InstallShield and the Standard Build and cannot get support. My last resort is this wizard. Please help me I am getting the following 2 warnings. I downloaded MDAC 2.8 SP1 for warning 2 and after I run the program it doesn't upgrade and appear in VB2010. How can I install it in VB2010 Pro. Also How can I get the .Net.Framework.2.0 installed.
Warning 2 The 'SAP Crystal Reports Runtime Engine for .NET Framework 4.0' item selected requires 'Microsoft.Data.Access.Components.2.8'. Select the missing prerequisite in the Prerequisites Dialog Box or create a bootstrapper
package for the missing prerequisite. SendGlobalMobileAdvertisingBlasts
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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.
View 5 RepliesIm using Outlook Automation to parse through a PST file, and Im having trouble checking attachment types. Im attempting to check the attachment to see if it is a MailItem, but its not working, heres the syntax that I'm using.
Dim msgAttch As Outlook.Attachment
If msgAttch.Class = Outlook.OlObjectClass.olMail Then
'Check MailItem
End If
I'm currently doing a project that includes access 2010 My question will be what driver can I use for an access 2010 *.accdb type file? For a *.mdb it works perfectly well with
ConnString ="Driver={Microsoft Access Driver (*.mdb)};Dbq=" & Application.StartupPath & "\CITSDB.mdb;Uid=Admin;Pwd=123;"
But, when I changed the mbd to accdb:
ConnString ="Driver={Microsoft Access Driver (*.accdb)};Dbq=" & Application.StartupPath & "\CITSDB.accdb;Uid=Admin;Pwd=123;"
It resulted in errors:
ERROR[HY000][Microsoft][ODBC Microsoft Access Driver]Could not find file '(unknown)'.
ERROR[IM006][Microsoft][ODBC Driver Manager]SQLSetConnetAttr failed
ERROR[HY000][Microsoft][ODBC Microsoft Access Driver]Could not find file '(unknown)'
And then it shows me that my code for
If dsLogin.Tables(0).Rows.Count = 1 Then
IndexOutOfRangeException was unhandled
Cannot find table 0
I knew it must be the driver but I don't know what accdb driver I can use for the connstring.
I am using MySql 5.0. I using Mupliple datareader in same connection i get error message. Is possible to use multiple Datareader in same connection?
I using Mysql Connection is
MySqlConn.ConnectionString = "SERVER=" & gServerName & ";DATABASE=" & DBname & ";user=" & gUserName & ";password=" & gPassword & ";MultipleActiveResultSets=True"
MySqlConn.Open()