Sql Server - Datareader Retrieving Data
Sep 9, 2011
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. Also when i compare two cust_id values, 1 taken from a textbox and the other taken from database column, even though both are same but the comparison result is false. I have compared using string.equals(str1, str2) and have also compared the two directly using if statement but in both cases even if the string is same but result is otherwise. [Code]
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Aug 30, 2010
I 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:
[Code]...
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May 13, 2011
I am kinda new to VB, but have used C# to pull data from a SQL Server db using DataTables and Reader, etc, however I am at a loss as to how to accomplish this in VB.I have a variable, which the user specifies, that I wish to use as a parameter in a SQL string, much like the following: "SELECT x FROM y WHERE x = '@param'" The result will then be stored in a string variable and I wiill do what I have to do with it.
[code]...
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Oct 17, 2010
i am working on my academic project in which i need to retrieve data from sql server table to textbox and image in vb.net . i am able to retrive data either in text box or only image can anyone help me out to get data in textbox as wel as image in picturebox.
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Feb 13, 2012
I have the following code;
Dim rdr As SqlCeDataReader = cm_sel.ExecuteReader
If rdr.HasRows Then
While rdr.Read
[code]...
The error I get is:
SQL Server Compact does not support calls to HasRows property if the underlying cursor is not scrollable.
So how am I supposed to check if data exists before actually reading the DataReader?
EDIT:the whole code:
Dim con As New SqlCeConnection(ConfigurationManager.ConnectionStrings("MyConnectionString").ToString)
Dim cm_sel As New SqlCeCommand("SELECT fID FROM Files WHERE fCatID=" & catID, con)
Try
[code]...
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Jun 2, 2010
I'm not even sure where to start. I would like to create something like the ADO DataReader but that works in a TCP Client/Server scenario.Basically, in the TCP Client, I want to be able to call a certain command in the TCP Server which will return a DataReader like object, which I can then iterate through such as:
while dr.Read from the client. In each loop, I would parse out the various fields as in a normal DataReader.The reason I want to do this is to gain the inherent efficiency of the DataReader object since it doesn't first load ALL of the data. To my understanding, the typical TCP Client/Server setup using streams, would first load all of the data on the server, then transport ALL of that data to the client for processing. I want to avoid that, and just stream the data as the client requests through the Read() command which means the connection will remain open to the server while the Read() command is being issued by the client, or until explicitly closed by the client.
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Feb 20, 2012
I have an SQL statement like:
SELECT FNAME, LNAME, CITY from EMPLOYEE
How do I create a multi-dimensional array from a datareader which should store values like:
John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach
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Jan 29, 2009
retriving the DNS server ip of my computer. But with my codes i only manage to the IP address of my computer.
Dim IPAddress As IPAddress = Dns.GetHostEntry(Dns.GetHostName).AddressList(1)
Dim strIPAddress As String = IPAddress.ToString
TextBox3.Text = strIPAddress
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Feb 19, 2010
I am facing a problem when i am retrieving image from sql-server's database. I am using this code
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Jun 29, 2011
my code doesn't show anything when ever I start on my button "start recording" it starts to record every keystroke on the and show it in a textbox and after that i am trying to get that data into text of a sql 2005 database with vb vs2008 but when ever I click on the button to show me the saved data , retrieve from database, it doesn't show anything, why?
and I also want to create new row everytime the new object is created...thnx
Databse Class
[code]
Imports System.Data.SqlClient
Public Class DataSaver
Private sqlConnection1 As SqlConnection
[Code].....
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Nov 28, 2009
Again I have problem with checking whether DataReader object has data or not?
Dim cmd as SqlCommand
Dim drd as SqlDataReader
cmd = New SqlCommand ("SELECT * FROM Stock", conx)
drd = cmd.ExecuteReader()
[Code]...
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Jun 25, 2009
I have a form in where I work with some data readers. One of my readers only gets the information from the first row. When ever I try to get something from the second row onwards I get an error saying that "no data found in row". I am using "ExecuteReader" not "ExecuteScalar". I cannot understand why I get this behaviour. Here is the The reader that gets me this error is reader2.
Dim reader As OleDbDataReader
Dim reader1 As OleDbDataReader
Dim sql5 As String
Dim SQL As String
sql5 = "SELECT * FROM Services WHERE ServiceID = " & Me.ServiceIDTextBox1.Text & ""
[Code].....
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Apr 27, 2012
I have a website that was written in VBSCRIPT that I am moving over to VB.NET. Until I have time to get to rewriting some pages/applications,I would like to update some of the code so they work a bit better.I am trying to grab a server variable on the VBSCRIPT page that contains our username from the enterprise login.I have 2 test pages here, one with language="VB" at the top and the other language="VBSCRIPT".
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Server Variables</title>[code].....
The VBSCRIPT page will list variables with no data when they have data on the VB page and in ALL_HTTP. Is there any way I can get VBSCRIPT to gather the correct info for all the server variables?
EDIT: These are the variables that vary between VB and VBS AUTH_USER, REMOTE_USER - logged in user on VBS, iis_anon on VB REMOTE_PORT - not listed in VBS
The following are listed in VBS, but have no data
HTTP_SERVER_PROTOCOL
HTTP_SM_TRANSACTIONID[code].....
Also there is a custom on I wish to get that is used for our enterprise authentication.
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Aug 7, 2010
I have stored an excel file within an SQL Server Table having the corresponding column data type as varbinary (MAX) through a VB .NET windows application form. how can I retrieve and open the stored excel file for manipulation?
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Apr 23, 2012
i have been in state of hectic for the last 2 days making lot of research and finally made this code worked it for me. My problem is that, how can i make this code retrieve the image from sql server database...use picturebox to load it in the vb.net program.
Dim myfilelocation
As
String =
"C:myPicturesmyimage.png"
[code]....
Is it also possible to change the location of image where its getting the image. i mean, i would like to tell other computers to get their images from anywhere as long as it brings images to my server.i mean, say that comp1 which is connected to my database server for storing and retreiving information, gets his image from his location then the application sends the image to my server...the application retreives the image from the server..as simple as that.
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Feb 4, 2010
i have return the follwoing to retrieving server date
Private Structure TIME_OF_DAY_INFO
Dim tod_elapsedt As Long
Dim tod_msecs As Long
Dim tod_hours As Long
[code]....
im getting error "arithematic operation resulted in an overflow
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Jun 6, 2011
I am returning a date from my database table:
objSQLDataReader("date")
Which gives me:
31/05/2011 16:00:50
How do I change this to:
31 May 2011
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Sep 20, 2010
i have created a table named students with photo as varbinary(max)
i have designed a form with two buttons(insert and retrieve) and a picture box on it
Under insert button:
Try
Dim st As
New FileStream(OpenFileDialog1.FileName, FileMode.Open, FileAccess.Read)
[Code]....
inserting image is no problem but when i retrive image in picturebox it gives i message as "invalid object name students"
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Apr 26, 2010
I'm using this code to retrieve the list of files from a FTP server
Dim request As FtpWebRequest = WebRequest.Create("[URL]")
request.Credentials = New NetworkCredential(username, password)
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails
Dim response As FtpWebResponse = request.GetResponse()
Dim responseStream As Stream = response.GetResponseStream()
Dim reader As StreamReader = New StreamReader(responseStream)
messagebox.show (reader.ReadLine)
It gives me alot of information that I dont need, I know that I can use:
request.Method = WebRequestMethods.Ftp.ListDirectory
Which only retrieves the file name but when I try to change it, it gives me an error. Error number 550. ListDirectory so I can only get the file name?
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Apr 26, 2011
i have a form with one combobox and textbox now on other hand i have a sql database
named balance with two column one as customername and and another as obbalance now i had binded all the customer name to the combobox now what i have to do is wen user selects a customer name from the combobox the textbox should show the obbalance of the selected customername here the customer name will not be repeated only one name with a customer
[Code]...
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Aug 14, 2011
I'm currently battling to retrieve an image from SQL Server 2008 R2 in an asp webapplication using vb.net. The image is stored in the SQL Server 2008 R2 database as an image type. I've been researching for the past few days and can't seem to find anything solid on this topic. Apparently, the image has to be retrieved using
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Feb 20, 2009
Is there a way to set session variables during login that are then available to reports? We have a reporting services server where we move and denormalize data from our transaction system for reporting purposes. In order to allow our users to login with the same user name and password from the transactional system we have set up custom forms authentication and after much trial and error it is finally working. In addition we have the authorization accessing our transactional system so that any changes in user authority is immediately reflected in Reporting Services.
Our problem now is that we would like to add some additional features such as locking down parameters depending on user authority/groups in our transactional system. We have found a way to do it but it's inefficient, basically we have stored procedures that will query our transactional system to check for access. The problem is that these queries will often be run for every report request even though the answer is unlikely to change. It would be nice to have access to session level data that can be set once during log in and then accessed from the reports.
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Jun 30, 2010
I am not sure how to phrase my question properly but I want to achieve something like this.
I have a class named Products public class Products
private ID as Integer
private Name as String
Public Property ProductID()
Get
Return ID
[Code]...
When I do the same, I am getting an error "Object Reference Not Set to an Instance of an Object.
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Apr 27, 2011
i have a form with one combobox and textbox now on other hand i have a sql database named balance with two column one as customername and and another as obbalance now i had binded all the customer name to the combobox now what i have to do is wen user selects a customername from the combobox the textbox should show the obbalance of the selected?
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Aug 3, 2009
Yes, you read it right! Exchange Server 2000. I want to create a script that retrieve information(ie. Last Access Time) of all the files that are place within the public folder of the Exchange Server 2000.
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Oct 16, 2011
I'm using a mysql as my backend database and i'm using the mysqldata adapter for binding the data, i have my data in the database, but the problem is i don't know how to retrieve it, for example when i want to add a record, before i add that record, i want to retrieve the data in my database to trap that the record i'm adding is an existing record
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Aug 17, 2009
I have a problem with my project. here is the problem:
My code for login is as follows:
dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure
[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
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Aug 1, 2011
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
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Dec 31, 2009
I got a weird problem here like I got a site that users can post comments on a friend profile page.Everytime a user post a comment my application sends e-mail to that page owner, you know to inform for a new posted comment on his/her profile page.The problem is I want to stop the application from sending email if that user has just recently posted a comment say like 5 hours ago/earlier.Here is the function I use that would try to check it:
[Code]...
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Oct 8, 2011
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
[Code].....
how do we connect database in access after con.Close() since we do all operation after the con.Close() and works properly.
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