How To Determine Connection State Of 'Automatically Connected Database' In 2010
Sep 22, 2011
I've searched the forums but never seems to find an answer for this one.. I recently connected to MySQL database server "Automatically" in Visual Studio 2010. I want to know if there's a way to determine the connection state for "Automatically created" connections in Visual Studio 2010. I know how to do it for"programmatically created" connections but just want to know how on the auto-generated ones.
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Nov 10, 2009
I am trying to find out if the connection of my sockets (TCPClient) is connected or not connected. I am using the following code:
[Code]...
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Apr 15, 2010
I have a piece of code connecting to my database retrieving data. I was just testing the form on another computer and everytime it loads this specific form it closes the form.You can see the lines I had to comment out in order for the form to NOT close on load. Is there something possibly that needs to be installed on this other computer? running XP pro 32 bit.
Dim conn As OleDbConnection
Dim comm As OleDbCommand
Dim dr As OleDbDataReader
Dim connectionString As String
[code]....
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Aug 3, 2011
i have an application. which is executed after every 5 mins. i have an open connection but it gives me the following error:
ExecuteScalar requires an open and available Connection. The connection's current state is closed.
my code is something like this. I have shown where all i am using ExceuteScalar()
Sub Main()
Try
connection.open()
cmd.ExecuteScalar()
[code]....
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Dec 19, 2011
Try If functionmode = "ADD" Then
[Code]...
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Jul 5, 2011
I got this error..The connection was not closed. The connection's current state is open.
This is coding to add data in Ms access in vb...
Imports System.Data.OleDb Public Class Form1
[Code]...
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Mar 11, 2010
I'm trying to insert a new records into database, one of those records is a "datetime"...when I type a wrong date, and try to insert those values into database, i get an error (about wrong typed date etc.)...ok, that's fine, things need to work that way. But here comes the problem, I correct the date, and then try to insert values again...here I get an error from the post title. And this doesn't work until I close that form and run it again...here's part of my code:
Dim cvLicence As New SQL
Try
cvLicence.upis("INSERT INTO blabla (itsnotimportant) VALUES ('something')")
MsgBox("everything's fine", MsgBoxStyle.Information)
[code]....
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Jun 12, 2011
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
exitwithout()
[code].....
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Jun 14, 2012
When a vb project is connected to ms access(DB) whenever u make any changes in d db using addNew or insert or delete follwed by update command the changes are reflected in copy of original db in the debug folder of our project.in which updated values chnges with each run .. no changes are reflected in d original db.is dere any command to make dese changes permanent.
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May 23, 2012
Error: The database has been placed in a state by user 'UserName' on machine 'ComputerName' that prevents it from being opened or locked.
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Sep 8, 2009
I need to make sure that the connection to a POS printer is successful before writing data to the database and then printing a receipt. The POSprinter is normally of type BTP 2002NP but may differ. The common thing is that they are all connected via COM-port and NOT usb, so no drivers installed at all on the client. Can I send some kind of "ping" on a COM-port and check if a device is connected and turned on? Additional information, the application is developed in VB.net and Visual Studio 2008
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Nov 17, 2011
I Receive Many UDP Connection From None IP Valid Devices With This Code:
receivingUdpClient = New System.Net.Sockets.UdpClient(Port)
Dim byteBuffer As [Byte]() = receivingUdpClient.Receive(RemoteIpEndPoint)
Now I Want Response Data To Device After Receive Data. I use This Code
receivingUdpClient.Send(receiveBytes, 10)
But Received This Error :
"The operation is not allowed on non-connected sockets."
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Dec 27, 2011
I am Using Visual Basic 2010. I want to check My Connection Status. Connected or not in Remote Server Connection (SQL Server 2008 R2). How To Check Connection Status..?
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Sep 15, 2011
My project is about recipes. I want to automatically create table inside in mysql database when I hit the add button on my project through codes. First is when I input recipe name in the textbox1 then my input will be saved in the recipes table under recipe name column and also create a new table through codes on what i input in the textbox1
Example of my database in sql
texbox1 input will be save here
recipes - id, recipename
And then it will also automatically create a new table in mysql database, create newtable, with id, quantity ,unit, ingredients
Private Sub iadd()
Dim command As New MySqlCommand("insert into recipes (recipename) values ('" & TextBox1.Text & "')", connection)
Try
connection.Close()
connection.Open()
command.ExecuteNonQuery()
[Code] .....
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Jun 27, 2009
How to get dialup connection state in VB.NET 3.5?
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Feb 5, 2012
Is there a way to time out the connection? And loop to retry until it can connect?
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Jan 12, 2010
I'm trying to connect a remote mysql database. I'm doing it from a vb.net 2005 application with a connector mysql.data.dll What's happening is, suppose if I try to connect thrice it connects twice and once throwing an exception that says A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. there's nothing wrong with the code, otherwise it would never have connected
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Apr 23, 2012
For almost a week I am reading and trying to find a solution for checking connection state using a TCP Client (using socket class) In my scenario I have a TCP Client that is connected to a server (it is not controlled by me) and i want that from time to time to check the connection state, and reconnect if necessary.I have read a lot of information on the internet but i did not find a suitable solution.Briefly, these are the methods that i have found on the internet and try to implement.But unfortunatelly, i have found some scenarios where the TCP Server is closed and the TCP Client is still saying Connected 1.Example from MSDN
[code]...
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Apr 21, 2010
Using VS 2005 and SQL Express 2005. This WinForm application runs fine on 5 out of 6 stand alone computers that is it installed on. The 6th computer is slightly older running XP sp2.As I understand it, using DbDataAdapter will perform the open, close and dispose functions for you. Therefore, Pooling should not be an issue. I am thinking that the default 15 second time out setting may be the cause?? There is some MultiThreading that will also use DbDataAdapters in the same manner but only 3-4 would be firing at the same time.The connection string is Data Source=(local)DataBase;Initial Catalog=Code;Integrated Security=True The command which throws the exception is If CodeDataAdapter.Fill(CodeDataSet.CodeTable) > 0 Then...So I am thinking that adding Connect Timeout = 60 to the connection string even though the 15 second default seems like a lifetime. Could this 15 seconds be eaten up if some other process or application takes over?
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May 9, 2012
I have a problem connecting to an access database. I'm currently trying to build a login/register program that reads the username and password from a database and allows login if the specified username and password are found. I have code that will work properly for that so that's not an issue. However, when I make an attempt to register a new username along with a bunch of other things such as email, password, etc. I am unable to because the database connection is closed. The code I'm currently using to open the database connection is :
[code]...
However, when I try to use this code to open the connection to the database, it leaves the connectionstate closed. I decided to then build in as a test, a block of code that would check on load to see if the connectionstate is open or closed. Each time I've run it so far by making a few changes it always tells me that the connectionstate is closed no matter what I do.
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Dec 15, 2011
is there a function that will allow coders to connect to multiple database? by just changing the connection string and not the variable declaration ...example:connecting to access is something like this
Dim Con As New System.Data.OleDb.OleDbConnection(ConString)
for sql is something like this
Dim Con As New System.Data.SqlClient.SqlConnection(ConString)
is it possible? acctually in vb 6.0 it is possible ...
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Jul 10, 2011
How to use Connection string with VS 2010 during form design? Actually i added database through Data -> Add new Data Sources.And When i publish the project How to publish database too? [code]
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Jun 21, 2010
I am a ASP Classic Programmer, professionally for a little over a year, I have developed some rather nice sites, including the one in my signature (Still a work in progress).
I have been forced to use ASP.NET (VB) for a FileUpload control, as it offers a self controlled way of creating Thumbnails, without the use of 3rd party controls, which is great, as my hosting server does not allow for 3rd party installs on their servers.
So.
The code below is what I have so far for connecting to the database and displaying a record is the "cookie" exist on the users computer.
Unfortunantly, this is not working, and to be honest with you, their is not a whole lot of resources available to show how to do this correctly.
So I am stuck with a lot of post and hoping that someone can actually assist me with this and tell me what I am doing wrong and maybe correct my code.
I am getting an error about the "Connection is closed"
If you want to re-write my code, I prefer something simple and basic, as the only thing that I am doing to checking rather the user is logged in, and if so, display a record from the database. I am NOT in the need for the DataGrid, so please do not suggest it, as I am only needing to check this one thing.
I would like to also add, that I have successfully contect to my database with the FileUpload control and save file names of the images uploaded, so I know that my connection string is done properly> But, for some reason the "SELECT" statement is causing a HUGE issue. (It was easier to insert, than to select, I am not use to that)
CODE:
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Dec 22, 2011
I'm wondering if I create a program that connects to a mysql database, will they be able to decompile it and do anything with the mysql connection information?
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Aug 29, 2011
I'm using VB.NET 2010, and Microsoft SQL Server 08 Express. I've never done a data bound project before so forgive me if I have no clue what I'm doing.
[Code]...
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Oct 11, 2011
I have developed a windows forms application in vb.net 4 which connects to a MSSQL database. I have used the built-in tools to add the data source, data connection and data set. (Data->add new data source-> etc.) The application is installed on staff laptops which may or may not have network connectivity and may or may not be able to access the server on which the database is held. Obviously this is causing unhandled errors when the program starts and tries to make a connection to the database. (using windows credentials) Does anyone know where in the code the connection is made so I can go in and add some error handling? Or any settings I can change to get visual studio to handle the errors nicely?
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Mar 4, 2011
I want to handle errors that might occur when user tries to connect to database. I don't know how to do that.This is my connection string used all over the program:
Using connection As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + txtFilePath.Text + ";Jet OLEDB:Database Password=" + txtFilePassword.Text + ";")
There are a few errors that i faced them myself:
[code].....
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Jan 24, 2011
I do apologise if this has been answered 9000 times already. I have looked over forums and google for days now. I want to connect to an sql database (created locally in the windows form project) i want to then interact with this db (add, update, select) however i am struggling with the connection string (server:? localhost?) the update functions (tableadapter.update(dataset)?) adding new information (newrow etc).
[Code]...
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Mar 4, 2012
I am developing a chat application using online connection to a mysql databbase. But i am facing a problem. After 10 minutes, MySQL closes all the chat connections because of the 600 seconds timeout (has been set by the host service i am using). I don't understand why is that happening cause every piece of my code which needs data from the database opens and closes the connection (i mean that it dosn't maintain the connection after the query's execution). If i .close() and .dispose() the connection, it still appears in mysql at sleep mode (it terminates only if i exit the program).
Dim MySQLCon as New MySQLConnection
Dim MySQLCom as New MySQLCom
Dim counter as Short
[code]....
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May 30, 2006
I'm viewing reports on a VB.net form using CrystalReportViewer. Once a report is opened, the Access database that is used within the report is locked (i.e., the Access MDB file can't be deleted). Even after the report is closed, the database stays locked until the VB.net app "ends". This is a problem because I want to be able to delete the MDB file at some point while running the app and can't. The VB.net app starts by opening a form named "Startup". No database connection occurs here. A button is pressed using this [code]I must not be properly closing the CrystalReportViewer or the Report form.How do I close the Crystal report and unlock/release the Access database?
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