How do you refresh a database connection within a VB application to SQL Server 2005 so that whenever data is changed in SQL, such changes are picked up by the application? For now the application only picks up the changes after it has been restarted, and that is not what I want.
View 5 RepliesIs there a way to display the connection properties dialog for connection string browsing(for database) in run time?
As I want the user to be able to connect to various database using the GUI.
After running the following sub (VS debugger), I try to detach the database in SSMS, but it shows the connection open still and won't let me detach. If I close program in debugger, the database shows no connections. I check the dataadapter's connection in the finally block and is shows closed. What gives
Private Function ClientMasterDBFiles(ByVal MasterClientDBConnection As String, ByVal DBName As String) As DataTable
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Our app allows admins to connect to a different database, which means we need to temporarily decrypt the app.config's connection strings, re-write them, then re-encrypt it. Here's my current 'simplified' code showing how we do all 3 tasks:
Dim config As Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
Dim section As ConfigurationSection = config.GetSection("connectionStrings")
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i am using access database for my program. now i have connected to the database in MDI form of main exe, and ir also works, user can log in, it gets verified etc etc etc. now here is the problem, when i load a form from dll and try to use any sql query on that form, i get message, "database connection is not opened". so what i did was, i added the connect() (a function i designed to connect to database) in the load part of the dll's form, it made the trick, query's started to run, everything went fine, and when i reload the form i.e after closing the form, i load it again from MDI form, i get error, connection already open..
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I was creating an mvc application and i had a model class with a dbcontext function the variables were in the same file. I added another field and changed the code in the edit create delete details and index views but i now get an error saying "The model backing the 'GameDBContext' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the DropCreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and optionally seed it with new data."
Imports System.Data.Entity
Public Class Game
Public Property ID() As Integer[code].....
refresh database of MS-SQL programmatically in vb.net
View 2 RepliesI am in a situation where I have a tool which is always running. Now if any new entry is added or deleted from the database then unless we dont restart the application it will not reflect the changes. So I want that the application itself should check for the updates or at least it should refresh itself.
View 6 Repliesi have a problem and it's hard to explain but don't know the solution.
A is viewing database from datagrid.
after that
B inserting a new data to database from different computer.
A still looking datagrid from database before updated.
if he don't click refresh or using timer how can the datagrid automatically refresh the data from database without using button or timer. i don't like using timer cause it eat resources a lot.
i am using a listview on my admin form to see those who are logged in. so i have a table which captures users logging in and logging out. this table data is reflected onto this listview. but i want the listview to refresh itself as soon as the user has logged out. this way the admin doesn't have to keep pressing refresh.so i want to know if there is way to refresh the listview on database update.
View 2 RepliesWith the code attacehd I would like to print the resulting queires on a winform, wich is happening now but only at the form load time.What I'm looking for is a way to have these databounds updated automaticaly everytime date changes on the database or timely every xxsecs or manually via a refresh buttom.
Public Class Form1
Public Function MyTime() As String
' Changes Today's Date into the DD-MM-YY format
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I have to do some maintenance on an old VB.NET application (Visual Studio 2003) that uses Infragistics NetAdvantage 2006. I have a UltraCombo control binded to a DataView.
How can I refresh the content displayed after a change in the database?
I'm using a OleDB connection to a access database. I'm entering a row into the database to set some user preferences. What i need to get is get back the row ID of the row I just entered. I'm more familiar with PHP and with PHP I use use this entry
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Lets say i label "label1" , and 2 buttons named "button1" and "btnRefresh " [code]So , when user press the button 1 , the text will change. But what should i put inside btnRefresh to reload the forms ? and display the default label.text = "Form Load" ???
View 9 Repliesthere are two computer connect to one shared database one of the user (user1) will insert new record then the records in (datagridview) of the user (user1) who insert the record will be 11 record but the(datagridview) of other user (user2) will still have 10 record.what the possible way that may allow me to refresh the records..Also how I can make a new record in datagridview of the user2 can be colored by yellow or red back color.
View 2 RepliesHow to refresh data gridview of an Access 2007 database using Visual Basic 2010?
View 2 RepliesI have a datagrid view containing a customer list that if if double click on a row it brings up a customer maintenance window. Once I hit a save bottom on the second form how can I automatically update the database, refresh the grid on the initial window but remain on the same row on form1 that I double clicked on in the first place. Currently I am re-loading the datagrid on the initial form with all the data once I close the second window down.
View 6 RepliesI am trying to copy a table in a database into another database on another connection in VB.NET, using OleDb. If they were on the same connection I would just use SELECT INTO, but they are not. I have two different OleDbConnection and cannot see an easy way to do this.
Right now I am attempting to just copy the database into a DataTable using an OleDbDataAdapter, and then loop through the DataTable and insert every record into the target database one at a time. This obviously takes a ton of time for the large DB I could potentially be dealing with, and I have to deal with escaping strings, null values, etc.
edit - just to make this more clear: I have two OleDbConnection objects, one is linked directly to a local .mdb file on my computer (JET). The other is linked to a database on our servers (SQLOLEDB). I am wanting to do this:
"SELECT * FROM fromDB INTO toDB"
But I can't because fromDB and toDB are on different connections, and the OleDbCommand object is only attached to one. The only way I can see how to do this is to connect to fromDB, copy it into a DataTable, connect to toDB, and copy all of the data in the DataTable row by row into toDB. I was wondering if there is an easier way to do this.
I am working on an application that ties into a SQL database on the back end. Currently the main form contains a series of combo boxes (Graph type, data format, location, and customer), two date pickers, and a button to launch the selections in a new form. Everything works just fine except there are a couple of things I can't seem to accomplish.
Example Data:
[CODE]...........
Case Select (with commented out lines for variations attempted):
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1) I would like to be able to use some sort of case statement to color the bars in my chart based on value. I have tried approaching this in a couple of different ways but neither of the options seem to work. First, I tried this (the If Not is used because depending on what values are passed to the stored procedure in SQL, different columns will be returned):
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Only one series is created with this method, so I can see how/why a Select Case would set all bars the same color. I have also tried creating a series for each row in the returned dataset but it results in 22 bars of different colors, for each of the rows (484 bars):
[CODE]..........
So is there any way to modify the second set of code there to only select the value from the "Percent TMHB" cell that corresponds with Row(i), rather than ALL values from the "Percent TMHB" column for EACH Row(i)?
2) Since I am drawing/creating these graphs in a new window, is there any way to also create a new timer on the "newFrm" and have the tick refresh the data? I've struggled with this but I feel like it should be easy. Say someone chooses a "TMHB", "Percentage", "Chicago", "All" (Graph type, data format, location, customer) and launches the graph, which opens in a new window, then they want to do "TMHB", "Percentage", "LA", "All" and have both windows up, refreshing automatically throughout the day. Can I somehow store the SelectCommand.Parameters values in the new form/timer so that it will query the database again every 5 minutes?
Example code for the StoredProcedure and creating the new form:
If combo_GraphType.SelectedItem = "TMHB" Then
Dim newFrm As New Form
Dim newChart As New Chart
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I am trying to change my windows application I made in vb.net that uses an access database. I do not know where this database will be stored at this time so my plan is to set the connection using code based off a text file that points to the location of the database. Here is the code I have but I know there is something wrong with my syntax because it putting "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|IWS.mdb" in both the data source and the database name.[code]...
View 14 Repliesi am an IT student and i want to understand very well how to program in visual basic.net and how to manipulate its connection to database since my project uses visual basic environment.
View 1 RepliesI'm just learning VB and would like to know: How do I create VB connection to an Access 2007 DB? I can use the DataGridView to view the table but can not create a connection to add records.
View 3 Replieswith the meaning of this snippet?
string conString =@"Provider=Microsoft.JET.OLEDB.4.0;" + @"data source=c:illing.mdb"; OleDbConnection conn = new OleDbConnection(conString); Conn.Open(); DataSet ds = new DataSet(); OleDbDataAdapter adapter =
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I 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
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I made program which connects sql database via WiFi network. I have timer wich every 10 minutes updates textbox information from database. If Network connection will be lose, i do not whant to get any error and after that lose data wich is in textbox, until sql database connection will not be. How can i check if connection exists and after that update data from database? Something like that:
Conn = New SqlConnection(ConnectionString)
Conn.Open() ' if connection is lost there gets error
If Conn.State = ConnectionState.Open Then ' But this does not works
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provide VB.net connection code to connect with sql server for adding,deleting and updating data.I'm new to .Net.I need to learn .VB.Please provide the code for this.Those who know the code please provide here.
View 2 RepliesPrivate Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim MyConnection As New OdbcConnection("Driver={MySQL ODBC 5.1
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I am trying to connect to access database in VB 2008 express. When I write the code like Dim cnTemp As ADODB.connection it gives error that ADODB is not defined.
View 3 RepliesI am using the visual studio 2008 but use the guide for 2oo5 .I wonder why the program show error after click the load button (btnload). I am following the http: [URL] and having problem with the 'Filling the DataSet'. Is it because of different version?
The code I use:
Public Class Form1
Private Sub Ordered_booksBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ordered_booksBindingNavigatorSaveItem.Click
Me.Validate()
Me.Ordered_booksBindingSource.EndEdit()
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I wrote a small application in witch I create a connection to a database. I'm new to this, so I followed the steps in MSDN help. I first created a link to the database with the "Datasource" of the Visual Studio environement. Then, in the code, I create instances of the dataset in the datasource and use a tableAdapter to register my changes in the database.
Now I want to allow the user of the application to specify the path of the DB file he wants to use. How can I do so? Do I still can use the datasource in the VS environment? I don't know where to start.