Sql - Multiple Database Connections Within 1 Application - .NET?
Mar 16, 2012
This may have been answered but my search hasn't found what I was looking for. Basically, I am developing an application which allows the user to build a query at design time, i.e. for users with no prerequisite knowledge of SQL The application thus far allows the user to select which table(s) from the database they wish to start querying (I won't go into the details of the rest for now)
My confusion is this; I already have the connection to the database in a subroutine which obtains the schema information and filters it to display only the available tables within the database, which then compiles the data into a listbox, here is that sub:
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Apr 8, 2011
I'm running a program where I call a function which creates a database connection and then runs a stored procedure. I call this function four times from four separate threads. I get an error (Login failed for user 'sa'. The user is not associated with a trusted SQL Server connection.
Exception Source:
.Net SqlClient Data Provider)
when I use multiple threads, but if I have the threads run one after another I have no
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Jun 11, 2009
I have an application which connects to a database, retrieves a username from a user's table and matches it against the username retrieved with System.Security.Principal.WindowsIdentity.GetCurrent.Name.On my localhost, everything works fine. The database exists on the development server but the application lies on my localhost. All of my authorization and authentication techniques are running smoothly.However, when I publish my application to the development server, I'm faced with the following error.Cannot open database requested in login 'databaseName'. Login fails.Login failed for user 'DevelopmentServerNameASPNET'.
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Nov 14, 2010
OK here is some code I nicked from web and I have changed some things, it works but only accepting one client, how do I make this accept multiple clients?
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Oct 8, 2010
I am new(ish) to Visual Basic and i have learned from looking at old VB6 code for programs that have been made for us in the past, this includes using the old ADODB connections and FlexGrids which both have been changed in VB.Net to OLEDB and DataGridView.I have started to understand the way the connections and datasets etc are created but i am struggling to get to where i was with the old code (I am trying to completely upgrade the code from FlexGrid).This is the VB6 Code i am trying to upgrade from:
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Sep 8, 2011
We are using VB.NET 2010. Our application receives client connection through socket, and currently each client has its own thread and socket. We would like to have multiple socket connections per thread, but we are having a problem doing it.
Below is our current program where each client has itsown tread and socket.
Public class frmMyForm:
Private Sub AcceptSocket(ByVal Sock As SocketTools.SocketWrench)
Try
Dim oSession As SessionClass
Dim oThread As Threading.Thread
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Feb 17, 2011
We are looking to design a security application that does the following on laptops:If the ethernet adapter is used (cable plugged in) disable/block all other network connections (wireless WIFI, mobile broadband (PPP), virtual VPN adapters etc)When ethernet adapter is not being used again, all connections allowed.We have looked in the WMI a lot but there are no good ways of doing this. Only disabling the network connection is not secure enough because most mobile broadband applications try to re-establish the connection. This should be an application that works on all laptop vendors without any user interaction (such as choosing interfaces etc..).
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Mar 2, 2012
I am writing a socket client into my application. I have multiple socket connections to make to different servers.
ClientSocket(1).BeginConnect(endpoint1, AddressOf Connected, Nothing)
ClientSocket(2).BeginConnect(endpoint2, AddressOf Connected, Nothing)
Both clients call the connected sub... how do I know which one is which?
Private Sub Connected(ByVal ar As IAsyncResult)
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Nov 11, 2011
I have written a program that uses directshowlib to capture a stream from a webcam and save as an AVI whenever a bird lands on the experiment platform for behavioral research. What I would like is to be able to allow another program or connection to the same webcam at the same time simply for preview purposes, is this possible?
Basically I want my app to still be able to record on demand when a bird interacts but I would also like a IP cam program like webcamXP/Webcam7 to be able to stream a live feed to the internet so we can have a live view of the platform. I had found some articles about connecting multiple streams from one webcam but am not sure how to go about it. If I have to I will simply mount a 2nd cam in the Bird colony and dedicate it to the web stream but if I can use the same cam as the recording cam that would be great.
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May 17, 2010
I am developing project on cyber cafe using vb .net 2005 and winsock i don't know how to accept connections from multiple clients to a server having winsock control
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Jul 19, 2011
Using VB.Net and SQL Server 2008 R2: I have recently had a database that using sp_who2 reflects a connection ".Net SqlClient Data Provider" is still active even though the .Net application has closed and disposed of all connections.
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Aug 17, 2010
I have a .net window application created and I wanted to see if it's at all possible to place various file dependencies off the web server. e.g. is it possible to have the connection to the database be off a web server?
I also would like to see if it's possible to place one of the .dlls off the web and have code that points to it to load.
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Jul 28, 2009
i've been previously using Visual Studios built in wizards for manipulating data access to and from an MSAccess Database, however just recently i coded my own classes and connections to the database, ive been able to select, update and delete records effectively however my problem comes with inserting records.
I have a 3 tiered table database:Tbl_PO, Tbl_Parts, Tbl_Shipments each po has multiple parts, each part has multiple shipments.when i insert a record into the tbl_PO, i need to retrieve the ID used on that insertion.
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Jan 24, 2012
MVC3 vb.net Application using built in session management. I have an mvc3 application that I would like to add being able to see the current number of users online to whether they are logged in or not. I have tried using: Membership.GetNumberOfUsersOnline.ToString But that only keeps track of current users logged in which is not acceptable in what I am trying to do. Is there any other method that keeps track of connections?
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Aug 19, 2009
I'm doing an application which uses the Database Wizard to link the textboxes, labels, and combo boxes to the data base. (Visual Basic in Visual Studio 2008). (Visual Basic 2008 by Shelly Cashman-Chapter 10)There are two problems: One of the combo boxes has the unique key identifier. You are supposed to be able to use the combo box arrow to select one of the unique keys. Every time I click on one of the unique keys to see the records connected to it, VB acts like I'm trying to input a duplicate key. My teacher hasn't been able to figure this one either. If I was connecting the code, I could fix this but I have no clue since I have to use the Database Wizard on how to fix it.
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Mar 8, 2011
I am on a general scenario of deploying my vb.net database application on my client's computer.
Thinking of future problem of changing the database connection setting, i am planning to store it in a normal xml file in the app directory so that where ever it is installed, in order to make database configuration i only need to make change to that file and my program runs smoothly.
So is this idea of storing database connection setting to xml config file in app directory or is there any other better idea?
I am planning it for vb.net winforms applications
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Sep 2, 2009
a small question: what is the difference between sync and async connections in a tcp/ip client/server application?
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Mar 25, 2010
I have an multi-database ODBC connection through a DSN. There is a primary database and two auxiliary catalogs. The Add Tables dialog in Microsoft Query only shows the tables in the primary database. If I pick one and continue on, the lists of columns in other parts of MS Query show all the columns in both the primary and auxiliary databases. If I pick a column, MS Query will look for that column in the primary database (great if it happens to be there, not so great if it doesn't). If I don't use any of the drop-down lists and just write a query in the freeform SQL editor, fully qualifying everything with the catalog names, the query runs fine.It looks as though MS Query is assuming only one database and one (default) catalog, and doesn't realize that it actually connected to several databases with separate catalogs.I get the same results with Office 2003 and Office 2007.Are multiple databases / multiple catalogs through a single DSN supported in Excel / Microsoft Query?
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Mar 14, 2011
I just want to know, What parameters or attributes should be taken in connection string so as to handle high traffic enterprise applications? Like in general we use server, initial catalog, userid, passwd. Some times we add timeout , and in some scenario pool etc. But i don't know what attributes should i take in as my common practice apart from above.
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Nov 11, 2010
I have an application running with a access db. I have written some code to copy & zip the db file to another location (selected by the user) for the purpose of backup. (I am using sharpzipwrapper)Whenever I try to run the code for the copying & zipping it gives me an exception saying that the file cannot be zipped as it is use.Do I have to close all open connections in order to backup the .accdb file? If yes then how? else what do i have to do inorder to get 'access' to the file.Do I have to exit the application to close all connections? These connections are written in code for e.g. :
dim
cnStudent as
oledbconnection
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Jul 31, 2011
I am extremly new to this concept of aps.net and vb. all the tutorials I see are c# based or very basic for vb. What I have is a contact forum with some basic information. I got the whole "check if the user has input information correctly down pat how ever Its this whole, connecting to a database (sdf) if in another vb file ands calling that method into aspx file and proessing forum input to say "take this, insert into bla..." I come from java, JSP and J2ee bak ground where its not that diffrent and I dont have all week to read books and take baby steps. I have until tuseday morning to finsih this. Right now I am as far as forum validation....
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Dec 17, 2009
I am making an application that uses multiple WebBrowser controls, and multiple proxies.The code for changing the proxy settings are as such:
#Region "Proxy"
Public Structure Struct_INTERNET_PROXY_INFO
Public dwAccessType As Integer
Public proxy As IntPtr
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Note: getRandomProxy gets a random proxy from a list.Problem is that whenever RefreshIESettings(getRandomProxy()) is applied, the proxy will be applied to all of the WebBrowsers, while i would need to have a unique proxy for each WebBrowser. Not having this would just error out the page in the other browsers and so on.
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Sep 12, 2011
I have a vb.net web application and when a particular function runs , i get data timeouts in the rest of the application..(ie..row not found errors or column does not belong to table but it does) The function is adding multiple rows in multiple tables in the database and is running in a for loop. It seems to be all SQL related but I am not seeing anything in the error logs in SQL or in the application Right now I am assuming it is memory related where to start note..the for loop will be replaced with a bulk insert but right now I jest need to resolve the issue of the timeouts
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Jul 12, 2011
Which is the best way to store application and user settings of an application running with multiple instances?My problem is that using the vb's "Application Settings" one instance would overwrite the other one.I want to identify each instance with a number passed via command line argument. I could use this number to identify the appropriate settings of the running instance, but I see in a local INI o XML file a better way to handle that.
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Dec 15, 2011
I am making a window based application in vb.net. Now i have work in two sql databases, so i when the window opens it will show two databases..when i select first db then i can work in that particular db only..if select 2nd db then i can work in second db only..how to do that?
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Sep 22, 2009
I am having two databases for the same application , one in windows and the other is web based.Since web based one have few functionalities I can't opt for a single database.At the same time I want to share Both databases to be updated with other's data so as to work error free with my module of appointment fixing.
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Jan 20, 2011
In vb.net I am using password protected database with following connection stringconnetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:vaivaiDB.mdb;JetOLEDB:Database Password=secret;"Database access works fine on the development machine.
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Jul 20, 2011
When I install my application, some forms are unable to connect to the database.
I say some because, when my login form works totally fine. Authentication happens.
But once I go into the main application, and open other windows, I start to get these error mesages:
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Apr 8, 2010
i need to make a database application that can write/retrieve cells/datasets from/to a database i buyed a book in there was an example of how to create a database application while debugging i had the "Object reference not set to an instance of an object." error and it highlighted this code
objDataRow = objDataSet.Tables("KlantenTable").NewRow
now the problem is here i declare something later in the code i write to it
objDataSet.Tables("KlantenDataTable").Rows.Add(objDataRow)
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Jun 22, 2010
I have created a Office management software in vb.net & access, but i m not able to run it multiple machines.
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