VS 2008 : OleDbDataReader Not Reading Only?
Sep 21, 2010
I am building an app to read a customers .xls file in to a array list the array is the being reordered and im writing a file out the back end.its doing several lookups in the .xls file to see if relivant data is there and it writes a different file (9 different specs) depending what is in each line/column.Sound simple and I have the app working great however when I use a customers live data I get an ex.message = "Could not decrypt file" the file opens in excel witthout any password prompts however it does look like the sheet is write protected but all im doing in my app is reading the data.
Using fileConn As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & OpenFileDialog1.FileName & "; Extended Properties='Excel 12.0 Xml; HDR=yes; IMEX=1'")
fileConn.Open()
[code]....
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Jun 22, 2009
When i run the program, i get error on the statement inside Do While Loop. The piece of code from my application is:
Dim selectString As String
selectString = "Select ContactName, Address from Customers"
Dim cmd As OleDbCommand = New OleDbCommand(selectString, con)[code].....
Object reference not set to an instance of an object
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Jul 14, 2009
what is the difference between OledbDataReader and OledbDataAdapter?
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Dec 4, 2009
With ms access as the database storage software. And if you know of other ways on how to read data base on a certain criteria and displaying the results that meets the criteria.
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Mar 31, 2011
I'm getting an "index out of bounds" exception and I can't figure out why. Unfortunately, my VS 2010 is in Spanish, so I can't say what the exact message says, but it's a System.IndexOutOfRangeException.
This is a table with a column holding Double values and a column with Date values. I have a form with two DateTimePicker controls, so the user can set a date range and they should see a number showing the total amount calculated between those two dates.
I did something like this:
Private Sub getData(ByRef total As Double)
Dim connection As OleDbConnection
connection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data
[Code]......
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May 18, 2010
What is the difference between OleDbDataReader & OleDbDataAdapter? What are there main functions? And what is OleDbCommand and what is the function of it?
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Jun 18, 2010
I am using the OleDbDataReader routine to examine and manipulate Access databases.I am trying to find a procedure for indicating when the end of file is reached.I am getting an error message once the end of file is reached and another record is attempted to be read.The.HasRows modifier does not work; that merely determines if the source database contains rows, not if there are any rows remaining.
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Jun 18, 2010
After connecting to a database using DataReader, how can I count the number of rows ?
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Apr 8, 2010
I am creating an application which uses OleDb to connect to an Excel spreadsheet and read the data into DataTable. The problem that I am having is that some of the columns I am getting are coming up blank, I've managed to narrow down that this is because that the first few lines for that column are blank. As unfortunately this is valid in the context of the Excel spreadsheet as not all dates etc. are required to be filled in. I was wondering whether anyone knows of any way that I could go about ensuring that the columns are populated by the OleDbDataReader even if the first x number of rows have that column as blank.
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Sep 21, 2011
I have two tables say "Table1" and "Table2". I made a UNION query and saved it as "AllTimesFailure". It is worth mentioning, I am using Access DB. When I am trying to fetch the records from AllTimesFailure through oledbDataReader, it says "The Microsoft Jet database engine cannot find the input table or query 'AllTimesFailure'. Make sure it exists and that its name is spelled correctly.". I double checked query name and found correct but the problem still exists. when I run the same query as I pass through my command object, it works fine in Access query analyzer and fetches records normally.
[Code]...
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May 6, 2010
I'm new to VB.NET. I'm trying very hard to not go screaming back to VB6...... I have a Query stored in an Access2000 database called 'build_VNMON'. (Does that make it a Stored Procedure ?) It uses multiple tables and multiple Union Statements to arrive at the desired results. It may not need to be as convoluted as it is, but I inherited it, and it works. What I really need is to output one column of the build_VNMON result to a text file, so I'm trying to use an OleDbDataReader.
[Code]...
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Sep 1, 2009
There are already multiple threads about this, but i don't have the knowledge about the different SQL databases/methods to make heads or tales from it.I am using an OleDbDataCommand, an OleDbDataReader and the following code
Dim Query2 As OleDb.OleDbCommand
Dim RetVal2 As OleDb.OleDbDataReader
Query2 = New OleDb.OleDbCommand("Select [section], [title], [id] From " & DtSections & " Where [volume] = " & volu & " And [chapter] = " & chapter & "", AccessConn)
[code]....
value)In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. Type) Object?
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Aug 7, 2009
I have this code, to read image (saved as varbinary(max) in database):
Private Sub ReadImage()
Dim connection As New SqlConnection(strConnectionString)
Dim command As New SqlCommand("SELECT [Image] FROM z1 WHERE x=1 AND y=1", connection)
[code]....
But it isn't very convenient code. It reads bytes from table, save them to file, and finally open file as image.How can I read it directly to image, without saving as file?
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Mar 3, 2010
Have some written code that enables me to log RPM from a drum, that I then convert to speed (KmH).Everything works fine so far.My current delima is trying to figure out how to read the RPM "changes" per timer interval.For example if I have at any given time a reading of ,let's say for simplicity,2000 RPM,and after the next timer interval it's 3000 RPM.I then have a change of 1000 RPM in that given interval.I need to have a way to determin this change store it into a textbox or combo box or something so I can work with it.As of now there are 2 Timers running.T1 is for the counting interval and T2 is for holding the count till the new count comes around.I had tried to add a 3rd timer to count the change but got rid of it because it did'nt seem to work.
Here's the part of my code I use for reading RPM and Speed cal..(VB2008 not VS 2010)
Public Class Form1
Dim product1 As Double
Dim product2 As Double
Dim product3 As Double
[code]....
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Aug 23, 2009
I'm trying to read values from a DB ,I tried to run the query manually and it works , there is a data. But the result I get on my app is always "" (empty). The empty value are "keywordd" and "dateee"
[Code]...
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Aug 30, 2010
I have a .csv file (created by external program). In my vb.net application I want to read the last cell value. External program updates the last cell value every 3 sec.For this I use the below code. But cpu usage increases (because timer event opens&closes new excel sheet every second)I was successfully doing this with vb6 without any problem, but with vb.net I'm stuck.
[Code]...
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Oct 19, 2011
I need to read in each line of a file that is comma delimited and I know how to do this.ut for this file, some of the values have quotes around them that contain commas and others do not. For example, the name field has "Doe, John and Lisa" and the other fields do not. How will this be handled? Will it read that whole field in as one or will it still seperate it as seperate fields?
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Jul 1, 2009
I'm sending an http request through a proxy using tcp, and then using a streamreader to read the netstream...The streamreader is supposed read each line up to </html> , however it doesn't seem to be waiting for the packet/response to be fully received, as it always returns only the first 5-10 lines of HTML.If I add a breakpoint at the line "Using sr", and pause it there for a few seconds and then continue the execution, it will return the full HTML up to the </html> as it should.This is the part of my code which reads the response.
Dim sendbytes As Byte()
sendbytes = System.Text.Encoding.ASCII.GetBytes(ReqHeaders)
netstream = tcp.GetStream()
netstream.Write(sendbytes, 0, sendbytes.Length)
[code].....
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Aug 26, 2009
i have my .xml files written like:
vb.net
<?xml version="1.0" encoding="utf-8"?>
<hiddenFields>
[code]....
I'm trying to read the values but i'm not having much luck, i have this:
vb.net
Function functionLoadHiddenFields(ByVal fileLocation As String)
Try
[code]....
i'm not to sure how to get the individual values?
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Nov 12, 2010
I have a program where I'm writing an xml file and later the same program is to read it. I'm writing the file just fine and get this output:
[Code]...
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Jun 16, 2009
i have read a lot about reading data from pdf but still very confused. i have to gather data from a invoice which is in a pdf format and store it in the database now the invoice contains text, tables, signature and barcode. this i have to again print after adding some of my data in another format and hence i need to get the data from the pdf file.
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Aug 13, 2010
I'm trying to read lines from a file using:Dim FileLine As String = ""Dim File As Integer = FreeFile()
Open "C:ext.txt" for Line Input # File But I get this error: 'Open' is not declared. File I/O functionality is available in the 'Microsoft.VisualBasic' namespace.
I tried to add Microsoft.VisualBasic as a reference, but it didn't work.
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Mar 17, 2009
I am working on a project in which the user can play another user on over the internet. Basically, how would i go about this?
What type of server would i need? Would i just use a designated computer as a server?
Also, what is the general process in contacting a server, reading/ writing from/to a server and storing data onto a server?
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Apr 14, 2009
how do i read from registry, i want my program to do this once u open it it reads the registry for a number 1 means non-active 1.2 means active i its active it bring you to form 2 if not it just stays t form 1
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Jun 12, 2009
I'm trying to make it so that it reads the xml, gets all the tables and puts all the tables names into the combobox..
i have tried..
ds1.ReadXml(meDirectory & "saves.xml")
With ComboBox1
.DisplayMember = "name"
[Code]....
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Jan 14, 2011
I'm trying to read the tag from the checkbox. For example: Private Sub CheckedListBox1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckedListBox1.Click
[Code]...
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Apr 8, 2009
I have an XML file (see attached) that has numerous different sections/categories.What I'm looking for is advice on how to pick out the different levels/categories and display them one after the other, with the click of a button obviously. Much like you would/can with a recordset using ADO.
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May 23, 2009
I am making a program that stores information for my applications. There are 4 main things I need in the XML file, the login information (User name and password), Application names and keys, and the owner of the application (who bought it). The program allows the user to enter as many applications and owners as they want and once login information is correct it loads the data. Then on exit all the data saves to a XML file.My XML file looks like this[code]....
Once I read all that the only thing I get is one application and no owners. How do I make it read all of the Apps then stop at the end of the Application Element?
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Mar 22, 2010
Ive searched for the pass hour on how to do this. Everything ive found is for vb6 and it wont work with 08 for some reason. Here is what i am doing, and the way i want to do it.I have a login form that has a checkbox remember me. Inside the if statement (If chkRemember.Checked = true) I want the code to write the username and password in a config.ini file in this format;
[LoginInfo]
Callsign=dsfsdf
Password=dsfdsf
[GeneralInfo]
Can someone provide me with a code i can use for this? I also want to be able to read that data to.
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Jan 24, 2009
here is my current code.
[code]...
Now that aint workin. What i want it to do is read and compare usernames and passwords of text box 1 and 2 with 2 text files on my website. I am not caring about encryption at this piont so plz dont reply about the security of this method i know the risks. What i need is some source code i can look at witch has a simular method to mine
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