View Tables In Open Connection?
May 18, 2010Is there a way that I can vew the tables once I have connected to an open connection?[code]...
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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]....
ExecuteNonQuery Requires An Open And Available Connection, The Connection Current Stat Is Close?
Nov 30, 2008i 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]....
.net - Connection Was Not Closed Connection's Current State Is Open?
Dec 19, 2011Try If functionmode = "ADD" Then
[Code]...
Connection Was Not Closed Connection's Current State Is Open?
Jul 5, 2011I 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]...
Establish A Connection When The App Is Launched And Keep The Connection Open Until The App Is Closed?
May 20, 2010I'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.
The Connection Was Not Closed. The Connection's Current State Is Open
Mar 11, 2010I'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]....
The Connection Was Not Closed..The Connection's Current State Is Open?
Jun 12, 2011Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
exitwithout()
[code].....
Connection Between Two Tables?
Dec 31, 2010I have a table called PARTS and table called PARTEXT.
PART has:
PartID
PartDescription
PartCostPrice
PartSalePrice
PARTEXT has:PartID
PartImagePath
For some reason (please don't ask me why) the designer of the database splitted the tables.I need a sql command to "combine" between the two tables by making new View, so it will show the content of the PART table and in each row it will get the PartImagePath of the same PartID that both tables have.
Populating A Datagrid View With Tables?
May 7, 2010I have got a database with a bunch of tables in it. So far, i can query that database and get the names of all the tables into a listbox. this is sweet.
What i need to do now is to enable the user to click on a table name thats listed in the listbox (which were put there using the
GetOleDbSchemaTable method)
and when they do, i need to populate the Datagridview with the relevant data thats sitting in the table that is listed in the listbox.
I've tried a couple things to get the tables themselves to populate the DGV(which kind of works now), but not the Data thats sitting in the individual table.
VS 2008 Open And Close Connection Every Second, Or Keep It Open All The Time??
Oct 21, 2009In 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.
View 5 RepliesVS 2010 Combination Of Tables (view Both In Datagrid)?
Jul 4, 2011How will I combine 2 tables from my database? And show its data in my datagridview.
View 2 RepliesScript For Sql Connection - Add A New Customer.mdf With Tables
Jul 19, 2010perviously i use ms access (.accdb) as my database, my sql connection is Dim connstr As String = "Provider=Microsoft.ACE.OLEDB.12.0;" & "Data Source = LibraryDatabase.accdb" now i have add a new customer.mdf with tables in my project, but what is the script for sql connection for (.mdf)?
View 1 RepliesCan Not Link Two Tables Together Using A List Box And Data Grid View
Jul 13, 2009I am trying to write the code needed to link two tables together. One table is a list box and the other table is a data grid view. What would the example of the code needed in order to link these tables together so that each time you click on an item in the list box, the data grid would then show the corresponding information that matches up with the selected item.
View 1 RepliesMerging Datasets - Pull One Or More Tables Into A Datagrid View
Apr 13, 2010In a nut shell what I am trying to do is, pull one or more tables into a datagrid view. I am having one heck of a time returning multiple datasets. I can eleect all indavidually, but when I try to select more than one, I only get the last "table" in the list. If I could establish a ODBC connection that would be better, but this will have to work for now with some canned queries I have.
[Code]...
Setup A Datagrid View Based On Two Contatenated Tables?
Dec 18, 2009Master child relation with a Customer form and Datagrid view that has to join two tables in a gridviewI got an error when I tried to modify the query of the gridview
This is the original code/query
SELECT `id`, `invoice_id`, `product_id`, `qty`, `price`, `p_tax`, `sub_total`, `sub_tax` FROM `invoice`.`1001_line_items`
[code].....
VS 2008 Select Data From 2 Tables (without SQL Connection)?
May 5, 2010My project is a standalone application with lots data retrieval and sometimes data update.No SQL server or connection provided)Here is sample code
Dim objDS As New DataSet("Quesetion")
Dim dtBook As DataTable = objDS.Tables.Add("Book")
Dim dtChapter As DataTable = objDS.Tables.Add("Chpater")
[code].....
Fill Up A Data Grid View With Records Of Two Related Tables?
Mar 16, 2010I try to fill up a data grid view with records of two related tables. Beneath you can find the code I use to handle this.
The first table �GemeentenT� has the following columns.
GemeenteId Primary key
GemeentePostnummer
GemeenteNaam
[Code].....
Inserting Data In Multi Tables Using Details View In DataSet
Mar 27, 2009There is a "how do I video" on how to properly control updates, inserts and deletes in multi-user applications on forms that edit master-detail related data. [URL] Massi worked through the process using Order (OrderID is PK) as the master table and Order Detail (OrderDetaiID is PK) as a related table in dataGridView. The dataGridView automatically generate orderDetailID whenever the mouse enters in a new row. I am doing a similar form, but placing order form and orderDetail form in two separate tabs in a tabcontrol, and also using Details view for both tables. When I click "new" button in BindingNavigator, the orderID is automatically generated. If I use dataGridView for my orderDetail tab, then the orderDetailID is automatically generated when the mouse enters. This allow me to insert/update tables correctly. However I need the Details View for my orderDetail form too. How do I get a orderDetailID automatically generated when user insert a new order and have the mouse click on OrderDtail tab?
View 1 RepliesTransfer Data From A View In Db To Header And Line Tables Via Code?
Jan 27, 2009I do no know how to go about doing this. I have a view in the db. I have gatheredall the data in that view. Now when clicks a button, i want to transfer half column data in the view to header_table and the other half into the lines_table. Also once it is transgered, I want to display it in a grid view. This time all the fields from header_table and all from lines_lines. Can someone guide me how will I do that by an example of code that is not very complecated and does what I want to do?
View 1 RepliesODBC Tables - Showing Status Or Progress Of ADO Connection
Oct 25, 2010I have a program that connects to an ODBC tables (3 of them) and I use select .... Left join etc Where ... etc. The issue I have is the connection takes about 20 to 25 seconds to complete. I'd like to create some status message so the user knows the system is not actually hung. Using Visual Studio 2010 Ultimate, VB.NET, ADO 2.7.
View 1 RepliesVS 2008 Binding Multiple Tables To A Grid View Then Updating, Inserting Or Deleting?
Mar 24, 2011How can I do this, this what I got so far.
Dim ClassID As Integer = 1
Dim da As New SqlDataAdapter
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=D:Database
[code].....
Error : Cannot Open Any More Tables?
Oct 14, 2011We have developed one multi threaded application in vb.net and we are using Microsoft Access Jet engine 4.0 for database. And when i run the application it execute successfully but after some time it gave an error "Can not open any more table." We searched a lot and we found that we have to close all the connections and all the readers
View 2 RepliesVS 2005 : Clear Tables/Ctrls To Open New File?
Oct 21, 2011I am using TextFieldParser to read a .txt file and create a DataTable I then filter the table and create 4 new tables I then bind those tables to BindingSources Then Bind ComboBoxs to the BindingSource Then bind TextBoxes to BindingSource I like the user to be able to Open a new file without having to close the program So upon opening a new file I have a sub routine that clears the tables the rows and the columns of each table as well the DataBindings to each control The problem is once I do the Text Binding as such
Me.list1_MLStxt.DataBindings.Add("Text", Subject_Values.BindingSource1, Form10.mls_txt.Text)
Then when I open a new file I get an error message conversion from string"""" to type double is not valid.If I never perform the binding I can open and reopen different files without a problem. So this is causing me to think that the problem is with the way I am clear something? But I am obviously not sureIs there something I am missing to clear everything properly in order to open and read and bind a new file?
Create A New For Open The Dataset Drag And Drop The Tables To Form?
Dec 31, 2009i have a few questions about seting up a form.when you creat a new for open the dataset drag and drop the tables to form it creates a top menu bar with pages plus sign and x and save.now when you run the app you need to press the plus sign to add data in the database..is there a way to make it that you dont need to press the plus sign?
View 3 RepliesVB Memory Usage - Open The Form That Is Linked To Multiple Tables - It Jumps To 157 Mb?
Aug 1, 2011I have an VB application that I developed in Visual Studio 2008. The back end is SQL. Application stores quite a bit of information and gets updated daily by users. It also connects to AD to get u/p, adds new accounts in AD and adds mailboxes. Users connect to it through Citrix. We noticed big spikes in memory usage. The executable itself is less than 5Mb; if I run it and it opens main form - memory usage jumps to about 19Mb, open a report - it jumps to 80 Mb. If I open the form that is linked to multiple tables - it jumps to 157 Mb. Once users start pulling new information in, update it and connect to AD or Exchange - it could jump to 250 Mb. Also noticed that if user with read only rights has application opened and idle - memory usage constantly changes with a pattern
like 17Mb - 19 Mb - 15 Mb - 17 Mb and so on. This user wasn't even using computer at the time. In general - what could cause such jumps in memory usage? What is the best way to prevent it? On the server we have Windows Server 2003 SE
Unable To Open [Design] View
Apr 16, 2009So there I was working on a project. I was putting the finishing touches on the GUI and clicked on the Image list I had added. VB froze up a moment, and when it came back I was on a code view of the form showing the properties I had just set up in the GUI. Suddenly, I can in no way view the form. I get a View code option, but no View designer. If I close out the project and open another, there it is "View Designer" right where I expect it. But in the project I was working on, it is just plain gone.
Is there something I am missing here? Can I recover my project?
If I run it in the debuger the whole form shows perfectly, I just can't get to it to edit it.
Can't Open To Connection To SQL Database
Nov 23, 2011I have a .mdf file that I open through an Open Dialog Box and use in a ConnectionStringBuilder (where I have the user instance set to True). Later, in one of my button clicks, I try to open the connection (connection.Open()). It then gives me an error as follows: "Generating user instances in SQL Server is disabled. Use sp_configure 'user instances enabled' to generate user instances."
Here is my code:
Option Strict On
Imports System.Data.SqlClient
Public Class frmMain
[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 RepliesHow To Open Database Connection
May 12, 2005I am currently working on a login page using vb.net. I would like to know how to make connection to an access database and verify that the user logged in is a valid user
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