Error Message - Connection Must Be Valid And Open - MySQL
Mar 15, 2012
I am building a program for a small office and I have a little problem with the code so I thought it's better to post a topic before continiue.. I have search into google and a lot of forums about database connectivity and my problem is simillar to other but a lot of things differs.The error that I get is on executeNoQuery() and it's called {"Connection must be valid and open."} Well a lot of things may related to about that.At least now from my re-search I covered all the filds of the problem and still not fixed. So please check my code for (Add new customer) button and let me know where I have mess up.
[Code]...
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Sep 15, 2011
I'm trying to make a login from in vb2010 as a windows application but I keep getting a error message saying "Connection must be valid and open"My code for the sign in button is:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdok.Click
' Adminstration login
' Add code here for secure admin
[code]....
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Jul 5, 2010
I'm trying to insert data into a mysql database, I'm using xampp as well if thats of any relevance? I keep getting this error: Connection must be valid and open.
on cmd.ExecuteNonQuery()
I'm following my Microsoft Access application that I've also written as a reference and that works perfectly.' This is the code for inserting into an access database which works and is tryed and tested:
Imports System.Data.OleDb
Public Class frmEnterDetails
'text box variables
[code]....
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Mar 29, 2011
[Code]...
Im clearly opening it there and its valid as i use the same connection to login with, anyone know the problem?
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Jul 17, 2009
I keeping getting an error.Seems to be the connection string.Error happens at connection.Open()
Error Message:Cannot open database "C:UsersJEREDocumentsVisual Studio 2008ProjectsBaseball2009Baseball2009DatabaseBaseball2009.sd"
requested by the login. The login failed. Login failed for user 'JERE-PCJERE'.
Imports System.Data.SqlClient
Public Class Field
Private Sub Field_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load[code]..........
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Feb 19, 2012
MVC3, VB.NET, using EF. I am working on coding up a simple function to handle checking for a valid MySQL connection. If the connection fails the test it will use the secondary server connection. This is required because our hosting provider does not provide failover or redundant MySQL servers. The problem is I tried to use a simple try catch method in the HomeController. This fails early because the Entity Framework is looking the connection that was set up when I set it up... Is there anyway to control that connection dynamically?
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Jan 15, 2012
I am creating a login form together with sql as may databse but when i run may program an error occur at "myData = myCommand.ExecuteReader()" stating that "Connection must be valid and open" what should i do on that to make it fix? [code]
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Nov 7, 2011
In the first form I will load Tabels in the secound I want to open the DB Connection. I wrote a Class which enables me to open and close the connection
[Code]...
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Apr 25, 2010
I am developing an application with VB using the MySQL Connector Net [URL]. Now each time I go to load data in to a datagridview or in to text boxes on a form, I have to provide something along the lines of:
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
'Create connection to MySQL Database
Dim conn As New MySqlConnection
Dim myCommand As New MySqlCommand
conn.ConnectionString = MySQLGlobal
[Code] .....
I think it would be better to leave the connection open to the MySQL database while the application is in use. That way I can just continue to execute queries of inserting and updating, without having the delay of the application having to reconnect. Is there a way where I can create some sort of background task in the application that monitors every few seconds that the connection is still active, and if not it tries to reconnect until its reconnected? I am trying to have it so that then I can code it to just do queries, and when the connection breaks - it disables the form until it is reconnected.
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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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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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Sep 8, 2009
...until an indeterminate amount of time passes and I get "The ProviderManifestToken '5' is different from '5.1' that was encountered earlier" error. Why is it encountering a '5' to begin with when I've only specified '5.1'?!!?The only way to get the error to stop is to reupload to edmx file (which has not changed at all), overwriting the previous one. At that point the application will happily chug along serving data to users until BAM the error occurs maybe a few hours later, sometimes days later and I'll have to start chasing my tail again.I've tried changing the ProviderManifestToken="5.1" to "MySQL", "6", "5" and the same situation will occur: works for a while then the error. As a bonus I only have this ONE edmx file in the vb.net webforms application so what is it getting confused bythe first few lines of my edmx file looks like:
<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
<edmx:Runtime>
<edmx:StorageModels>
[code].....
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Nov 19, 2011
I get this error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*' at line 1 [Code]
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May 6, 2011
I am getting the error "The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine." in the connection string when opening a connection to an Access database.
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Aug 1, 2010
I've added a database to my application with 2 fields:"ip" address and "started" that holds the number the application was started from that specific IP.I want to upload the database to my site hosted at google.sites. When the program is started it should make a connection with the following cases:
1-no connection with the database (possible no internet available) - it should display an error message
2-there is connection, the IP is not stored on the database, it addes the IP to the database and the field "started" with the value 1
3-there is connection, the IP is stored on the database, it increments the field "started" by 1
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May 4, 2012
I'm trying to get a grasp on it. Anyways, i'm having the an error for the cmd.ExecuteNonQuery() it gives me an error message as follows "ExecuteNonQuery: Connection property has not been initialized."
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim cmd As New OleDb.OleDbCommand
If Not cnn.State = ConnectionState.Open Then
cnn.Open()
[CODE]...
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May 22, 2012
Here is code that I'm running. I am new to vb.net and setup a MySQL server 5.5 and I just want to insert a name into the database that is located on my computer. I can connect to it through the Server Explorer in Visual Studio 2010 premium, but when I try connecting in the program it gets to the cmd.ExecuteNonQuery() method and says that InvalidOperationException was unhandled. also I have the Connector/net version 6.45 installed
[code]...
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Jul 14, 2009
[ERROR]
System.Net.Sockets.SocketException:No connection could be made because the target machine actively refused it 192.168.0.59:500 at system.Net.Sockets.TCPClient.Connect(String hostname, Int32 port) at WinClient.Form1.btnSignIn_Click(Object sender, EventArgs e)
[/ERROR]
Though I dont believe the issue is with the code here it is:[code]......
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Jul 9, 2009
I was wondering if its possible for VB to display all available COM ports that are open. he reason that I ask this is because this program will be run on various computers where the COM port will not always be the same. I have a text box now that the user can choose which com number he/she wants but if the wrong one is entered, the program crashes rather than displaying an error message. It would also be nice for the system to show which available com numbers there are
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Dec 10, 2009
Why am I getting that error message? This is the code which it's happening to:
Public Class frmford
Dim LoanAmount, InitialPrice, Make, TradeIn, OriginationFee, DepositAmount, Model, Options, AirConditioningTax, GST, PST, Total, Subtotal, APR, Months, RoofRack, SunRoof, SideAirBags, TintedGlass, RearSpoiler, GPS, PowerLocks, FreightAndPDI,
[Code]....
I tried to Dim those variables as double and it didn't work either.
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Dec 20, 2009
I'm trying to rename some image files....pretty straight forward it seems. However, I keep getting the message "Procedure call or argument is not valid"[code]...
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Aug 20, 2009
In trying to open an access dataset I first click on add new connection and at the prompt enter a microsoft access database file. I click on test the connection and it says the connection is working. I click the next button and get the following error message: Format of initialization string does not conform to specification starting at index 0.
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Oct 7, 2010
"Object no longer valid" Error Message
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Aug 13, 2009
I get the error message: "Format of initialization string does not conform to specification starting at index 0" What does this mean and how can I get the database to open in vb express 2008?
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Jun 19, 2012
Currently I'm working on a piece of code that involves using the Crystal Reports Viewer to export .RPT files to PDF. My problem is that the code works on literally everything except the website I'm planning to eventually put it on.
When placed on the website it throws back the error "Failed to open the connection." which I believe is connected to the SQL Server connection that's formed in order to read data for the report itself.
The code itself is solid and works when used in a separate console application I built to test it whether said code is run on my local machine or on the server itself. It even runs when I test the website in Visual Studio's virtual host.
I've narrowed it down to being some sort of permissions issue, but I am not knowledgeable enough in the various permissions settings to figure out which ones specifically apply to this situation. It's worth mentioning that other pages on the website are directly connecting to the same database, but they are doing so directly through Linq instead of going through the Crystal Report Viewer.
So does anybody know which settings I need to modify in order to fix the connection error.An added note: One of the other suggestions is to make sure there's an ODBC DNS in place that matches the one being used by the code. I have created such a DNS already.
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Jun 29, 2011
I'm creating a tool that will query Excel and intialize the default settings for the site's Cad Software.I want 2-20 users to be able to simultaneously query excel. Currently I have the spreadsheet open on one computer and the other test machine gives me this error.
GetOleDbSchema Table Require an open and available connection. The connections state is closed.
I could use some help on the code design. Should I use Datareader instead....Does that have less permissions issues? Or do I need to open up the oledbconnection in a different manner?
Private Const cPageData = "PageData"
Private Const cPrinterData = "PrinterData"
Private Const cSupportData = "SupportData"
Private Const cUserData = "UserData"
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Aug 2, 2011
I have o problem on my codes sqldr = sqlcmd.ExecuteReader when i debug the program error says ExecuteReader requires an open and available Connection. The connection's current state is closed. i dont know what its means that error..
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Jun 4, 2010
I'm connecting to my mysql server using ODBC in vb.net, the database is shared throughout the company because it is used in an accounting program (simply accounting), each user has their own account user/pass to login to the database. I have developped a program that uses the accounting database and combines it with other information, my problem is that at least once a day I get this error when I run my program: "(10061) ERROR [HY000] [MySQL][ODBC 3.51 Driver]Can't connect to MySQL server on"and the error persists for at least 4 hours, for some reason it starts to work again later on in the day.
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Mar 28, 2009
I am using MySQL 5.0 as back end. I am using MySqlData.dll in my project. When i am trying to execute the following code,
Try
Dim cnData As New MySql.Data.MySqlClient.MySqlConnection
Dim lcmd, lcmd1 As New MySql.Data.MySqlClient.MySqlCommand[code]....
I am getting error message as "There is already an OpenDataReader associated with this Connection which must be closed first." I have to use overlapped multiple datareader
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Dec 30, 2008
I need a code for the open file dialog that if a file is not supported then a message box appears stating the error. This is my open file dialog code. [code] The message box pops up like it is suppose to, when you click ok the open file comes back up like it is suppose to. When you put in the correct file the message box comes back up again. Also the message pops up even if the correct file is put in the open file. but if you close the file dialog the image is where it is suppose to be.I believe the code for the public sub wrongfile is what is the problem. can some one look it over and let me know what changes are needed.
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