Data Reader Not Reading Column
Oct 15, 2010I have a column ("Notes") in a sqlexpress database as nvarchar(1000). It will basically hold notes. It is pulled froma richtextbox control.[code]...
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Reading ASCII Data From Magnetic Swipe Card Reader?
Sep 27, 2011We have the customers credit card number on file which we use simply to identify them when they swipe at our computer. The problem i'm running into is that when they swipe their card in the card reader (Magtek mini usb) it outputs the data as ASCII which looks something like %B followed by the credit card number in whatever textbox i have the program focused on. I'm sure i could just search the textbox for any 16 character number string and assume that is their card number, but i was just curious if there is some best practice to decript the ASCII output from the magnetic card reader.
View 1 RepliesSQL CE Data Reader "No Data Exists For The Row/column"?
Feb 26, 2010I'm using VB 2008 and accessing my SQL Compact Db using the following code:
mSQLceCMD = New SqlCeCommand
mSQLceCMD.Connection = New SqlCeConnection(mStrConn)
mSQLceCMD.Connection.Open()
mSQLceCMD.CommandText = strSQL
[Code]...
Reading Excel Data By Column?
Oct 5, 2011I have never read from an excel file in VB.NET before so sorry if anything is off.I am downloading an .csv file from a vendors ftp service that has 8 columns ( style # - mfr.item # - description - metal type - availability - center weight - total weight - retail value )I am trying to retrieve all data in the rows bellow style # and retail valuethere are roughly 4,649 rowsI am not sure how to do this.
I load the excel file using the microsoft.office.interop.excel:
Dim eApp As excel.Application
Dim eBook As excel.Workbook
[code]....
Reading A Blank String From Excel When Trying To Read The Header Of A Data Column?
Aug 25, 2011I use an OLEDB connection to read from an excel database, and this loop to read in all of the data from each of the columns
While reader.Read()
For i As Integer = 0 To reader.FieldCount - 1
temp = reader(i).ToString + ControlChars.Tab
output_file.Write(temp)
[code]....
Some of the columns contain date information, which are read in fine (usually as a string "2/20/2011" or so), but the headers of those columns are read in as a blank "". The headers for all the other columns read in fine, but not for the date containing columns.
SQL Odbc Reader Not Reading Next Value
Jul 8, 2011I am trying to get a whole column from a table in sql DB. I used the code below, but in my OdbcReader, i only have 1 fieldcount.[code]....
View 4 RepliesOffice Automation :: Reading Excel Using OLEDB - Wrong Data Type For Column Returned?
Jul 1, 2009I am trying to read some data from an Excel 8.0 worksheet using OLEDB thusly:(Warning - contains curly braces)
Code:
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
using (DbConnection connection = factory.CreateConnection())
{
[code]....
The problem is that for some columns it sets the data type to be Double even though the spreadsheet column format is "Text" and teh column contains non-numeric data. Then when it gets to that cell it returns DBNull instead of the text value.
VS 2008 Handle Error - Reading A Xml Document Via A Text Reader
Feb 18, 2011I'm reading a xml document via a text reader, this is my code
[Code]...
Pull/fetch Data From SQL DB Using Data Reader And Loding To XML File
Sep 9, 2009how to pull/fetch data from SQL DB using Data Reader and loding to XML file.
After that I will have write code to read XML file and download to CSV file and Test files.
VS 2008 : Can Data Reader Be Used As A Data Source For A Grid Control
Mar 21, 2010can data reader be used as a data source for a grid control?
View 5 RepliesCreate A Data Row Using Data Reader Object?
Jun 15, 2009I have a data reader "dr " that returns a row fo data, Assume dr returns values of 6 columns I need to create an instance of DatarRow using "dr", so that later I can create a collection of datarow objects that I will be adding to a table. However, how do I create a DataRow using dr object?
View 1 RepliesGetting A Value With Data Reader
Oct 7, 2011Currently i am using this code
[Code]...
How To Use Data Reader
Jul 24, 2010How do I really use data reader in vb.net. I'm using odbc to connect mysql and vb.net. Function I declared on a module:
Public Function form2search(ByVal drugname As String) As OdbcDataReader
cmd.CommandText = "SELECT * FROM drug WHERE Drug_name LIKE'%" & drugname & "' "
Return cmd.ExecuteReader
End Function
[Code] .....
I see a result, but it only loads the first item on the database. I've put this code in the text_changed event. What's the proper way of doing this? And what's wrong with the 2nd code, why is it only loading the first data. As you can see the con is the module where I declared the function. Then I created an object of it in the form.
Launch An Application Called Foxit Reader Pdf Reader?
May 18, 2011I want to launch a application called Foxit Reader pdf Reader .I know System.Diagnostics.Process.Start(path) can do it but . Requirements are Foxit Reader should be installed on machine.Now if it is installed how to serarch for the path of its Executable to provide the parameter as I can not hardcode the path for different machines.
View 3 RepliesAsp.net - Optimizing SQL Data Reader?
Aug 10, 2009I am using SQl data reader to get value from SQL database.Language VB.NET.After getting data into reader, i run a while loop
While reader.Read
If reader.HasRows() Then
/* Proessing of data *[code]....
How To Implement A Data Reader
Jul 1, 2009Are there any examples on how to implement a datareader? I have try copying the code from MSDN but;--"Dim reader as SQLDataReader = command. ExecuteReader()"Where it is placed? As a declariton at the beggining of a form? or as as VB resource?and then how those it bind a to a dataGridView? How can I loop through each rows once is bind to use the contents of the column/row?I can perform the above function easly inside of MS Access using VBA. I have gone through various books from WROX but none of them show a clear example or the code is obsolete.
View 5 RepliesLoop On For A SQL Data Reader?
Oct 15, 2010I'm switching over from PHP to vb.net. And some of the concepts are a bit different. Mainly I struggle with concepts and keywords, so it hard to look stuff up. Currently I'm creating a dashboard and needs to run a lot of different sql queries. But I see where I should be able to minimize my code. But things that I have tired don't work. Example below of two chunks of code that I should be able to put in some type of loop and increment a value for my sqlstring and textbox output.
[Code]...
Return Data Reader Value?
May 27, 2010i have create a procedure to return data reader value, but it not return and returning null reference?
'Public Shared Sub GetData(ByVal Tablename As String, ByVal queryfield As String, ByVal Id As String, ByVal lblmsg As Label)
' Try
' Dim Cons As OleDb.OleDbConnection = DBHelper.GetConnection
' Dim Com As OleDb.OleDbCommand = New OleDb.OleDbCommand("Select * FROM [" & Tablename & "] WHERE [" & queryfield & "]=" & Val(Id), Cons)
[code]....
Cannot Receive Data From RFID Reader
Feb 13, 2010I'm using VB 2008 to received data from serial port (RFID Reader). below is the coding that i used. the problem's, the RFID Tag number does not display on the textboxt. [code]....
View 11 RepliesCheck If Some Value Exists In The Data Reader?
Jun 21, 2010How can i check if some value exists in the data reader
View 7 RepliesChoose Specify Data To Be Read By Sql Reader?
Aug 16, 2010I have the first form and create 5 checkboxes which are connected to my db. Whichever checkbox is checked and the value will be inserted into the db (value: 1; data type: tinyint).And now, the second form will pull out the data base on the which checkbox is checked when the button is clicked. But for somehow i got stucked at the following code.
The first form:
Dim nValue As Boolean
If chkbox5.Checked = True Then
nValue = 1
[code].....
Error : The Data Reader Has Been Used Before It Is Assigned A Value
Oct 18, 2010I'm having a bit of trouble developing my login page! Currently i have 2 text boxes which a user can input a username and password. My form should then check whether this data relates to the data in the database and either grant or deny access.The error i'm receiving occurs at the line "If theDataReader.HasRows Then"It says 'The data reader has been used before it is assigned a value"
Here is my code:
Imports
System.Data.SqlClient
Partial
[code]....
Populate Combo Box Through SQL Data Reader Using DAL,BAL & UI
Jun 17, 2010How to populate a combo box using SQL Data Reader in DAL, BAL and UI atmosphere. Please find below my code snippets and correct me if I'm wrong anywhere in this code.
'DAL Code
Public Function PopulateComboBox() As SqlDataReader
_cnCon = New SqlConnection(_conString)
_cnCon.Open()
[Code]....
What should be the UI code? Is the code specified in DAL and BAL is correct? I knoiw how to fill the combo box with values from SQL Data Reader. But I dont know how this can be done in 3 Tier application.
Return The Rows In A Data Reader?
Oct 18, 2009I have a table in my database and I want to return the rows in a data reader and retrieve them in variables. I can do that well but I can only return the last record. The reader doesn't process all the rows.
Try
Dim myconecction As String
myconecction = My.Settings.DataSource
[Code]......
Sql - Data Reader Formatting Output?
Jun 15, 2010I'm using the following function to generate a list of users connected to a selected database. How would I change this to a single line for multiple identical results?For example: "sa (3) - MYCOMPUTER" rather than listing "sa - MYCOMPUTER" three times?
Function ConnectedUsers(ByVal SelectedDatabase As String, ByVal SelectedInstance As String)
Dim myCommand As SqlCommand
Dim dr As SqlDataReader
[code]....
Stream Reader Missing Out Data
Dec 30, 2008I've set up a stream reader to get data from a serial file, functionality for that is already set up.
My problem is that the program seems to be missing out every other line of code in the file, which kinda defeats the point of a serial file. [code]...
Printing A PDF Using FoxIt Reader Or Adobe Reader?
Feb 28, 2012I am having an issue with both Adobe Reader and FoxIt Reader when trying to print a PDF document. Both issues are different but a solution to either one will allow me to fix my issue.The issue I am having with Adobe Reader when trying to print using the following code is that it will not print it to the network printer I specify but just the default printer.
Dim AdobeReader As New Process
AdobeReader.StartInfo.CreateNoWindow = False
AdobeReader.StartInfo.Verb = "print"
[code].....
Data Reader Using Text Change Event?
Jan 9, 2011I want to create a textbox which contents are validated every time the text in it changes. And an image is displayed beside the textbox if it is correct and another image shows up if its not correct. Pretty much like ajax.
Heres the method which I called from the class.
Public Sub read1()
cmd.CommandText = "SELECT * FROM testdb WHERE Name='" & name & "'"
Try
[Code]....
Problem is, the method seems to be only called once. And the first image that was displayed stays the same even after inputting a data which does not exist in the database. I'm connecting this program to a mysql database using odbc.
Data Type Precision In Oledbdata Reader
Oct 13, 2009I exported xlxs files to sql server using oledb data reader. I'm using visual studio 2005. [code]
View 3 RepliesEID SDK - See If Card Inserted Into Reader Then Read Out Data
Mar 14, 2010I am trying to use the eID SDK (for using the belgian ID-card) in VB. It's supported but I can't get it to work. I have never worked with sdk's before. I did manage to get it to work in c++ in console but I really need it in visual basic. Also the VB examples that come with the sdk are made in an older version of visual studio and when my version tries to convert them they don't work. I want to use the sdk to see when a card is inserted into the reader and to read out the data. (both i got to work in c++ console).
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