DB/Reporting :: SQL Connection Open/close?
Dec 16, 2011
SQL connections confuse me sometimes In almost every SQL related code on the internet the routine is like this;
* Open connection
* Execute SQL command
* Close connection
Is it good practice to just open a connection when the application starts and use that connection until the application closes?I know that sequential connections are required when processing more queries, but what if I need to poll a certain Table every x seconds? Isn't is better to keep that single connection open for as long as the application is running (and re-open when a failure occurs) instead of opening a new connection every x seconds?
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Nov 30, 2008
i make a class and when i call on form then that error occurs "ExecuteNonQuery requires an open and available connection, the connection Current stat is close "
Class Code isImports System.Data.SqlClientImports System.DataImports System.StringPublic Class DatabaseKits Dim Cn As New SqlClient.SqlConnection Public Function BuildConnection() As Boolean Try Cn.ConnectionString = "Persist Security Info=False;Integrated Security=True;Trusted_Connection=Yes;database=BizAimsPro2008;server=Server-2k3s" BuildConnection =
[code]....
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Sep 29, 2010
I have an SQl Connection: Con
con.close
after I close the connection I cannot copy the Sql Express Db because it is still in use but I have CLOSED the connection.
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Oct 21, 2009
In my program, I have a timer with a inteval set to 1000ms. The timer is executing a MySQL-command, and right now I'm opening and closing the connection each time.
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Apr 26, 2012
I want to know what is the right way to close my Database connection while its open.
This is how i open my connection.[code..]
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Dec 28, 2010
In our application we use IDataReader which actually call function from one.dll where weExecureDataReader()
We have many calls in application and in some places For some reason I am getting error message "DataReader already open" but I am not sure where.What will happend if I simple close that conection in the that .dll? Am I going to make trouble to database because one datareader left opened? I assume closing connection will close reader too and gargage collector will manage that left opened datareader..
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Dec 22, 2011
Should I open a connection to MySQL at the load of my application and close it when you exit or should I open and close the connection only when I need to run queries?
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May 17, 2010
I have a connection string in my app.config:
Code:
connectionString="data source=.sql2008 ;Database=Database1; Integrated Security=FALSE; Persist Security Info=True;" />
How do I change to another database (one of many) without using multiple strings? Can I change while the connection is open?
Code:
Dim myConn As New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("ConnectionString"))
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Apr 17, 2008
If I use the CmdObj.ExecuteNonQuery() I got an error
I'm not having an open connectoin.
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Apr 21, 2009
When using SQL connections in my program, will I have to open and close the connection and the data reader each time I want to access the database ?
[code]...
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Mar 4, 2011
In a program I'm working on, I want a "Loading..." dialog to close when it can't log in to a site using the username and password provided by the user. Basically, I have the code set up right because the function it is supposed to carry out when that occurs does work, but for some reason it ends up in some really weird stuff happening. In the Loading form, I have it set to do "Form1.Show()" and then "Me.Close()", assuming it would simply show the login form and then close the Loading form. However, when this happens, the Loading form closes, and then for only an instant Form1 shows, and then the Loading form shows and Form1 closes. This happens forever until I stop the debugging, and I can't seem to figure out why. Am I using the wrong method? What exactly does Me.Close() do anyways? All I want to do is close the form and open another
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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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May 20, 2010
I'm developing a device app in VB.net that will access a SQL Server database. I need to establish a connection when the app is launched, and keep the connection open until the app is closed. I've done the following:In the Master Module:
Public CNN
As SqlConnection
In the Main menu form load:
CNN =
New SqlConnection(sqlConnString)
CNN.Open()
Then when I want to read from the database:
Dim sqlDR
As SqlDataReader
SQL = "SELECT Name FROM Table"
[code]....
When I run the same code without the global CNN, but rather dim the connection inside the Select function, all works well.
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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 10, 2010
I am trying to login with this code which is working alright but the problem is anytime i make a mistake in trying to login with a wrong password is gives me an exception that the connection was not close but it is open i have try to fix it but to no avail. [code]
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Feb 4, 2009
As I watch in MySql Admin connections to server, I see the connection get made but it never disconnects. Is this different from VB6?
Private Sub WorkerThread1_EnterEvent(ByVal sender As System.Object, ByVal e As AxVBVoiceLib._WorkerThreadEvents_EnterEvent) Handles WorkerThread1.EnterEvent
Dim conn As ADODB.Connection
[Code].....
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Nov 2, 2009
I used code below to close connection, is it right?
Try
myConn.Open()
mySQLCommand.ExecuteNonQuery()
Catch ex As Exception
'code to display error message
Finally
[Code]...
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Dec 23, 2009
I created a connection to a Microsoft Access database by using the wizard. Now in the server connections I see my data connection to the db. I'm trying to create a method to compact the database, so I used JRO to do it. To do it however, an exclusive access is required, and when I try to call the method I get an exception.
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Aug 13, 2011
In my program I got multiple spots where I open a Connection to an Oracle database, read some lines via a stored procedure which returns me a cursor, put them in an IDataReader, close the connection and go on.
Now everything works fine till the point of closing the connection. I've watched the connections opened to the database via TOAD for Oracle and I figured out, that the database seems to keep an connection opened after I said m_Connection.Close and m_Connection.Dispose.
I use Oracle.DataAccess and get an error after a short time, that there are to many connections. I debuged my session and made sure, that vb performs the close() command and it does it, but the database not.
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Mar 4, 2009
everytime i try to delete this file it says there is a connection open and it can't close. i think i've narrowed it down to my crystal report, but i can't get it close the connection.
[Code]...
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Apr 11, 2012
Can anyone tell me how I close an opened SQL connection inside a Function?
I call a Select Function like this:
[Code]...
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Feb 10, 2010
How do I close a connection of strongly typed dataset? I want to backup my database with a zip technique. But I can't access it when my program is open. I've closed connections of all table adapters but it didn't work.
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Nov 24, 2011
I have the following code in my Server Form:
Imports System.Net, System.Net.Sockets
Public Class ServerForm
Private serverSocket As Socket
Private clientSocket As Socket
[code]....
for the first time, when I click on Connect, it is going to connect to server as well and also it works if you click on the disconnect. for the second time if you click on the Connect button, it gets connected but the disconnect button is not working.
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Nov 1, 2009
How do i make it so when i close my client the server will restart listening and allow another client to connect.
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Apr 11, 2008
i know this question was asked a couple of years ago by TheMinistered .. but i cannot find an answer, and i have exaclty the same problem (using both VB6 and VB.net 2003) :
When I attempt to connect to a remote SQL server via ADO it takes almost 20-30 seconds before Open returns. I don't know if it's something I'm doing wrong... here is my connection string/code:
Private Sub Class_Initialize()
Dim strConnectionString As String
Set m_objConnection = New Connection
[Code]......
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Oct 14, 2011
I am performing a simple exercise of opening an SQL Server database connection, pulling the first record of a table from a DataReader object, and then closing the object. However, I have noticed that theres bit of a delay, about 5 seconds or so, in closing the connection. However, the delay only occurs after the command object executes the specified query. I've worked in a setup like this before and don't remember there being such a long delay while closing the connection. [Code] The connection closes almost immediately. What gives? I have narrowed it down to the where the .ExecuteReader line that causes the delay in the connection close. Whats causing the delay and how do I resolve it?
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Jun 7, 2012
I have an application that I made in VB.NET. I put it in the server on my office and every other user access it via network connection. I only mapped the drive onto their computer and then I cope the shortcut to the application. can I close all the application that is running with a single code? I sometime need to close all the application first before I can do anything with the application (for example, modifying the report etc.). My current method is still the manual one, which is calling everyone to close their application or running all over the place closing the application myself.
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