Update Query Failing - Error: Connection Must Be Valid And Open
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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Error: Connection Must Be Valid And Open
Jul 5, 2010I'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]....
Error Message - Connection Must Be Valid And Open - MySQL
Mar 15, 2012I 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]...
MySql Error "Connection Must Be Valid And Open"
Sep 15, 2011I'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]....
Connection Must Be Valid And Open
Jan 15, 2012I 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]
View 7 RepliesDTABASE NOT UPDATING - Error (update Requires A Valid Update Command When Passed Datarow Collection With Modified Rows)
Sep 28, 2009I have an issue with a data base updating it won't update for me in debgging mode it is stopping here on this bit of code which is highlighted in red. the error which comes up is .(update requires a valid update command when passed datarow collection with modified rows.)
Public Sub UpdateDataSource(ByVal ChangedRows As database.dataset1)
Try
'The data source only needs to be updated if there are changes pending.
If (Not (ChangedRows) Is Nothing) Then
[CODE]...
Error - ExecuteScalar Requires An Open And Available Connection - The Connection's Current State Is Closed
Aug 3, 2011i 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]....
Cannot Open Database Using Sql Query For Connection?
Nov 17, 2009i am doin project using vb.net 2005 and using this sql query for connection
sql = "select username from login order by username"
con.ConnectionString = "Data Source=" & hostname & "; Initial Catalog=college;integrated security=sspi"
but m getting the following error:
Cannot open database "college" requested by the login. The login failed.Login failed for user 'CI4Admin'.
Use Datareader And Open New Connection To The Database On Every Client Query?
Jul 6, 2009I'm building application that will heavily use database (about 25k query's in few hours) , what is the best way to go:
A) use datareader and open new connection to the database on every client query.
B) load all the needed tables into dataset once the program loaded and use that dataset for the query's?
Data Not Updating Error "Update Requires A Valid Update Command When Passed DataRow Collection With Modified Rows"
May 29, 2009I am completly flummoxed!!! I have writen code for updating my table from a form but when I use the same code only changing the table names it wont work I get the following message: "Update requires a valid Update Command when passed DataRow collection with modified rows" My codes are as follows:
[Code]...
System.InvalidOperationExeption {"Connection Must Be Valid And Open."}?
May 22, 2012Here 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]...
SQL Query Failing A DataTable?
Aug 19, 2009I have a function (GetData) that parses a SQL string, makes a connection to a SQL Server and dumps the result to a DataTable. It works perfectly on a series of SQL calls I have. I have new query I have added and now the function balks at the adapter.Fill(table) call. I do not understand why the call fails. The SQL portion works fine when run directly against the SQL database (Management Studio). I am thinking the fuctions not capable of dealing with the subquery somehow, just not sure why.
Bindingsource4.DataSource = GetData("SELECT QTY,ITEM_NUMBER,DESCRIPTION,(Select STATUS_TEXT From ITEM_STATUS_LIST Where STATUS_VALUE = Line_Items.Status) FROM(LINE_ITEMS) JOIN PURCHASE_ORDERS ON
[Code]....
Show Valid Com Ports And Display Error If User Tries To Open Invalid Com Port?
Jul 9, 2009I 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
View 5 RepliesError 'update Requires A Valid Insert Command When Passed Data Row Collection With New Rows'
Jun 15, 2011When ever I try to update a record from data grid using a dataAdapter record it always showing ' update requires a valid insert command when passed data row collection with new rows' From specific sql server Table only. Resulting me holding up a project.
View 4 RepliesSQL Connection - Error Message:Cannot Open Database?
Jul 17, 2009I 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]..........
Sql - Update Query Syntax Error In Asp.net Application?
Jul 14, 2011process is user selects a gridview item it redirects them to the update page and using a datareader, fills the text boxes and check boxes based on the id passed in the url the user can then make their changes to the text boxes/ check boxes and then press the update button which runs the update query. what i have found is happening is that although a user might change the text, when they submit the changes, the update query is still using whatever was loaded into that text box by the data reader on the page load. Here is the code below:
Protected Sub SubmitBTN_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles UpdateBTN.Click
Dim tiresdim As Integer = 0
If TiresCHK.Checked = True Then
[code]....
Updatable Query Error When Trying To Update Excel?
Apr 9, 2012I know I've banged heads with this error before, but before the reason was because of my IMEX setting. This is the reason why I made two connections to the spreadsheet, one that uses IMEX=1 for the SELECT query and one with that option removed for the UPDATE / INSERT queries. So now I'm stumped why this is breaking in the following [code].....
Is there an issue with trying to open the same spreadsheet with two connections (I thought I had done this before)? Or some other issue that is causing this error to be thrown? BTW, I'm using this in a vb.net program so I don't think the issue is related to the security issues that asp users usually face with this error... On the other hand, I'm also on Win 7 and I know that its security is much tighter than on XP where I've used other programs that also update an Excel spreadsheet. I wouldn't think so, but would I have to run this in administrator mode in order to update the spreadsheet?
VS 2010 Update Query Syntax Error
Feb 16, 2011When I try to add an Update query, then open the Query Builder, I get an error saying: Error in table name or view name in UPDATE clause. Unable to parse query text. The only code that is in the Query Builder is UPDATE How would I fix this? If this is needed, the table name is Authentication, column names are AuthKeys, and Available.
View 2 RepliesAsp.net - Crystal Reports Viewer: Failed To Open The Connection Error
Jun 19, 2012Currently 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.
SQL Update Query Returns Error Message Saying Not All The Parameters Have Been Set?
Jul 8, 2010I'm trying to update an Access database by using an OLE connection, retrieving the information from textboxes where the user enters the new information.All the fields in my Access table are required fields, so I have validated that some info is entered in each one of the textboxes and that is the correct data type.But when I run the update query I get an error message saying something like values haven't been entered for some required parameters (my Visual Studio is the Spanish version, so I can't give the exact error message in English).The bit of code where the error occurs is inside the procedure called by my "Ok" button:
Dim campo1, campo2, campo3, campo4, campo5 As String
Dim campo6, campo7, campo8 As Double
Dim campo9, campo10 As Integer
[code]....
(I didn't post the whole code inside the procedure, but of course I'm creating the connection and everything)
The table has 10 fields, and the data is read from the textboxes and stored in variables (campo1, campo2, campo3, etc.), which I'm then using in the "set" query command.
"id" is the first field from the selected row in the datagrid, which I'm sending as a parameter to the procedure called by the "OK" button.The error message shows at runtime, so I'm guessing it's something in the query. Am I writing it correctly?
Update Query Not Working For Access And Not Showing Any Error
Jul 30, 2009this is the code
Dim con As New OleDb.OleDbConnection
Dim com2 As New OleDbCommand
Dim constring As String = ConfigurationManager.ConnectionStrings("esourcecon").ConnectionString
con = New OleDbConnection(constring)
com2 = New OleDbCommand("UPDATE Customer SET CName = @CName, CAdd= @CAdd, CTel= @CTel, Cmob= @CMob WHERE CName='" & C1.Text & "' ", con)
[Code]...
id is an autonumber field and if i change the where string to another column then also i dont get any error and the values are still not entered
VS 2010 Error Whitd Access Update Query
Apr 27, 2012i have this code that should update my data base but i kep gething an error saying: its not possible so change or delete the regists Because the table 'MembrosCompasso' has relating records
[Code]...
VS 2008 Recursion Failing With Command/DataReader Objects Already Open
Jun 26, 2009I'm trying to put together a quick example for another thread about treeviews, and I'm getting a problem when I have a recursive routine, getting the message.
Quote:
There is already an open DataReader associated with this Command which must be closed first.
I'm a tad confused as I am explicitly creating a new command every time through the loop, so I'm not sure (unless its something ADO is doing behind the scenes) how the datareaders higher up the tree are interfering.
Here's my code :
Private Sub SetupChildren(ByVal ParentID As Integer, ByRef ParentNode As TreeNode)
Dim MyCommand As New SqlCommand("SELECT * FROM Groups WHERE ParentGroup=@ParentGroup", m_myConnection)
[Code]...
Obviously I could close the data reader down before calling the next level of recursion but it would prevent the code continuing the loop at the current level when it had finished processing children.
Excel DataSet Error: GetOleDbSchema Table Require An Open And Available Connection
Jun 29, 2011I'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"
Vb2010 - When Debug The Program Error Says ExecuteReader Requires An Open And Available Connection
Aug 2, 2011I 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..
View 1 RepliesLanguage Query - Encountered The Error " Keyword Is Not Valid As An Identifier"?
Jul 25, 2011Presently working a tutorial in visual basic 2010. I have encountered the error " keyword is not valid as an identifier" I have read the definition of an identifier in the beginners section. Although I undertand the definition of an identifier I still am not sure of it when looking at a line of code. The tutorial gives an analogy but does not show examples of identifiers as they would actually apprear in a coding project.
View 3 RepliesQuery Error And Conversion From String "Insert Into Table1 (cust_id," To Type 'Double' Is Not Valid
Jun 3, 20111st i get this error
query error and Conversion from string "Insert into Table1 (cust_id," to type 'Double' is not valid.
when inserting data to database 2nd error is
when use employee name to get employee id i got result always 0 here is the code
" select id from customers where name2='" & ComboBox1.Text & "'"
Insert Statement Error.. "Update Requires A Valid UpdateCommand When Passed DataRow "?
Feb 17, 2009when the program is already save the data and when the process is on updating the dataset it give me error say's"Update requires a valid UpdateCommand when passed DataRow collection with modified rows."The error occur at the line in bold letter in the codes below..
Dim classgroup As String
classgroup = ""
If Me.ClassComboBox.Text = "Key Project" Then
[code].....
VS 2008 : Update Or Remove Record From Database : Syntax Error (comma) In Query Expression
Mar 17, 2010When I'm trying to update or remove record from database I'm getting this error:
Syntax error (comma) in query expression 'Ime='Blagojce', Prezime='', Adresa='', Grad='', Telefonski_br='( ) -', Fax='( ) -', e_mail='''
Here is my connection string:
command.CommandText = "DELETE * FROM podatoci WHERE Ime='" & ime & "', Prezime='" & prezime & "', Adresa='" & adresa & "', Grad='" & grad & "', Telefonski_br='" & broj & "', Fax='" & fax & "', e_mail='" & email & "'"
where ime, prezime and so on are ListView selected items.
VS 2008 Error "Update Requires A Valid DeleteCommand When Passed DataRow Collection With Deleted Rows" In Deleting Data
Apr 12, 2011I have a basic Table and I can add and save data, but when I try to delete, I het this error:
[Code]....