Vb Express Not Updating Local Database?
Mar 13, 2012
i'm using a copy of visual basic express for my home projects. i'm just started one that is needing a local database, so i added one to the project and created the tables with with colums no problems.
i created an 'Admin' user straight into the database and use that to log in. i have also created an a form so that you can add other users and view existing users in a datagrid view.
the original source code i used was supplied in on this forum page:
[URL]
its all well and good, and works fine, right up to the point when i shut the program down and then re-open it the next day, all the users i created the previous day arent there anymore.
the code for creating the users is this :
Dim con As SqlCeConnection = New SqlCeConnection(My.Settings.Database1ConnectionString)
con.Open()
[Code].....
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Aug 22, 2010
Only my local dataset updates when adding, deleting or editing records.The Source Database is supposed to update on issuing DataAdapter. Update(dataset )However, when I check my source database after running the operations it remains the same as the original.
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Apr 5, 2012
how can i deploy windows application developed using Vb.net and Sqlserver R2 Express as local database?..how can i make it in setup format(including sqlserver) to deliver to clients?is it compulsory the client should install SQL Server R2 Express in his system apart from the installation of this windows application?
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May 24, 2011
Visual Basic 2010 Express, lets the user to add a Local Database with .sdf extension. These databases needs MICROSOFT SQL Server to be created or they can run in the user's pc without any additional software? What are the limit of these databases unlike an external database?
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Apr 13, 2009
I have created a local database using the DB wizard in 2008 express.I have created a table called users and I can access the sample data that I have entered into it using a windows form.When I try to add a new record things come unstuck. The record shows in the windws form as being present and the record count increases to indicate this. But when i check the DB itself there is no sign of the record.I am using the tableadapter method as outlined by MSDN. So the question is what am i doing wronghere is the code from the form:
Public Class frmS4
Private Sub UsersBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles UsersBindingNavigatorSaveItem.Click
[code].....
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Oct 24, 2011
I found something very strange, in the data base explorer I modify the conection to the location of the data base(F:My DocumentsMy ResepteResepte.sdf) , but after raning the app. the path is back to what it was in the project folder and so the same in the selution window. It is set to Do Not Copy. How can I change this so that the IDE looks at the propper data all the time.
Hendri Bissolati noviceprogrammer@vodamail.co.za
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Apr 7, 2012
I am trying to connect to an attached mdf (SQL Express local) file, where i want to delete all the stored procedures. When i execute my code at executenonquery command i get the error "There is already an open DataReader associated with this Command which must be closed first.".
[Code]...
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Dec 17, 2010
I'm using a SQL Express 64 database on a separate server virtual machine. I've been developing my app for some time now in VS2008 on XP SP3. Using .Net 3.5 I've just come across a strange problem. If I update a checkbox from unchecked (the default) to checked, it saves OK. If I click to uncheck it, the change does not get saved. I'm using the UpdateAll method. I tried a single Update command as well, just for that table, but it was the same.
[Code]...
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Jul 15, 2010
I have been reading about ADO, SQL, datasets, data adapters etc and have gone into information overload. My next step is to create a simple data file of my own that I can manipulate, update, sort etc in VB Express. Do I need another piece of software? I read about MySQL, which I understand is primarily used to access databases on the net, but can that be used to create a simple local data file on my PC? Can you simply hard code something in VB Express?
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Oct 6, 2009
I have noob question. I made a dataset of a sql express 2005 database using the designer. So it's a typed dataset. Then I declare some tableadapters and fill them.Now I do this to add a record to my dataset:
Private Function SaveOrder(ByVal controlenummer As Integer, ByVal PK_BaanID As Integer, ByVal starttime As DateTime, ByVal stoptime As DateTime) As Integer
Dim orderRow = dsIntveen.tblOrder.NewtblOrderRow
orderRow.Controlenummer = controlenummer
orderRow.FK_Baan = PK_BaanID
[Code]...
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May 28, 2009
Basically back in VB6 days, I created several VB6 apps with Access as the backend database. I'd package my Access db file with the application setup, which copied it on to a shared network drive, and then different computers on the LAN could use the same backend database file, and that worked just fine. With SQL and VB .Net, I've done work with a SQL database hosted on a remote server, so you can basically build your query string easily and anyone can connect to it from anywhere, and it works just fine.However, what I'd like to do is have a local SQL express database as the backend for a VB .Net application and make a setup program that can install it in a way that it could be shared on a Local area network, without the user who is installing the application do anything.
I know about building a connection string with the local machine name, but I don't really have any experience with including an actual MDF file with the application. Does anyone know how it works, and is it a better approach? Does it work similar to placing an access file in a shared unc path?I know that ClickOnce (which is awesome) can install SQL express easily on a user's machine. However, the key is that I want SQL express to be installed only on the machine that is going to be the database server in a LAN enviornment, and not on every machine, unless it is neccesseary. And then how does your VB app know how to build the connection string to access the database from any machine on the local share?
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Nov 1, 2011
Is it possible to connect to a database on SQL Server R2 Express from Visual Basic Express? I am following a set of tutorial videos done in SQL Server 2005, but cannot seem to connect to create the database. I have created the database in SQL Server R2 Express, but cannot connect. Is there a work around?
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Feb 29, 2012
Here is the scoop: I am trying to make a user account SQL database work with Visual Basic 2008 Express for login purposes, i.e. usernames & passwords. Plan is to host this server so people can login to use the the application and verify they have a valid account. I would like to host all the account information in SQL due to the possiblity of hundreds of users at any given time. I also need the ability to add data to the database for users registering for the first time. The SQL server will need to be able to access the SQL Server databases remote via WAN.
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Mar 28, 2011
I have an application that will not load unless my local SQL Server is running on an Vista Home Premium machine. This started after a .Net 1 to .Net 4 conversion. I am using a sub main sub that is not being called (msgbox is not fired when entering the app), however, I see the app through taskmgr with increasing memory usage, but then the app is removed from the list. By design, if the program cannot locate a SQL Server a form pops up with a connection box to locate the SQL Server for the app. How it determines if it has a valid connection is the program looks for a connection string in the registry, then attempts to connect to it, however, none of this code executes because of the failure to enter into the sub main.The two machines I have tried the 32 bit app on
XP Pro: Failed / Using SQL Server 2008 Express
Windows 2003 Server: Works / Using SQL Server 2008 Developer
Both machines have .Net 4 Client Profile with Extended?
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May 13, 2005
It's probably just a case of me not looking in the right place or not seeing the obvious, but does anyone know if a machine with just version 2.0 of the .NET Framework should be able to run a VB.NET Express application which accesses a SQL Server Express database file? Or is there an additional requirement for a non-development machine to have some kind of SQL Server Express runtime component in addition to the 2.0 Framework?It seems to be counterintuitive to expect that a VB.NET application would be able to access any kind of SQL Server data without having some kind of SQL Server host component (Express or otherwise) installed. But then again, it seems just as counterintuitive that Microsoft would require the download and installation of the new framework as well as a separate database runtime in order for the average user to run an application with accesses a local SQL Server Express database.To me, it runs contrary to the whole concept of XCopy deployment to require more than just the application's files and .NET Framework for an application to run properly. But nothing I've read so far explicitly indicates that a user would require anything more than the app files and the framework to run an application which accesses SQL Server Express data. But...I can't get any VB Express applications which uses a SQL Server Express databases to run on any machine that doesn't have SQL Server Express installed.What am I missing?(Apologies if this isn't the right group to post this in.
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Jun 12, 2011
I'm using Visual Basic Express 2008 to create an interface with a order database in MS Access 2007 (.accdb file). Everything is fully functional except updating the "Inventory" table is very slow. Updating around 2200 items takes almost 2 minutes and the window will appear as "not responding" for the duration if you click away and come back. Here is the process:1. Tab-delimited text file is picked by user, which includes all inventory items (not just new ones)2. Each line from text is parsed and read into variables (tempSKU, tempItemTitle, etc.)3. Old items are updated and new ones are added. -> This is the bottleneck
I used to have a series of IF statements to check which elements were changed and report them, but that was about 2x as slow. The new code is a little faster but doesn't provide the feedback I liked (update part is commented around):
Private Sub btnImportInv_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) andles btnImportInv.Click
Dim strName As String
[code]....
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Apr 19, 2011
I'm trying to update a data user using vb.net2008 and sql server management studio express for my backend. the error says "must declare the scalar variable "@username"
Here's the code .
Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles btnupdate.Click
Dim connstring = New SqlClient.SqlConnection("Data Source=MISD-
[CODE]...
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Mar 30, 2008
I am trying to copy a table from a network database to a local database. I used DAO and could check if the network table existed using a function that tried to assign a TableDef object to the table in question. If there was no error then I assumed that the table existed and the function returned true...Or it would error out and return false.I could then proceed with the copy or not as the case may be.I am converting the code to ADO.net and need to know how to check for a table. [code]
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Jul 5, 2009
What is the difference between a local database and a Service-based database? I read the MSDN and searched the Inet.
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Feb 29, 2012
I am trying to make a user account SQL database work with Visual Basic 2008 Express for login purposes, i.e. usernames & passwords. Plan is to host this server so people can login to use the the application and verify they have a valid account. I would like to host all the account information in SQL due to the possiblity of hundreds of users at any given time. I also need the ability to add data to the database for users registering for the first time. The SQL server will need to be able to access the SQL Server databases remote via WAN.
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Mar 8, 2012
When I try to insert a row into my table I am getting a couple errors.
The primary key is set it auto increment. I tried to add the same row two different ways and after seeing the errors I am lost.
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Feb 14, 2011
I'm trying to use LINQ to SQL in Visual Basic 2010 Express.
It allows me to create the .dbml file, but in order to drag items from the Database Explorer window to the design surface, I first have to get my database listed in the Database Explorer!(this is a remote SQL Server database - not a local .mdf)
I already have a good, working connection string to the remote SQL Server database, but that doesn't help me when I'm trying to generate the DBML at design time.
Can anyone tell me how to get my remote SQL Server database identified in the Database Explorere window? When I try the "Add Connection", I am limited to Access, SQL Server Compact, or SQL Server Database File. If I try to enter the IP address & port of my DB Host I get a 'database file does not exist' message. Doesn't seem to want to let me point to a remote DB server...
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Apr 6, 2012
I am trying to make make a database in vb.net but I am having troble I want to have a form that a user could add and edit columns and rows to the tables in my database. Now a sevice based database would not work on my computer because i did not know how to set up the correct sql sever for vb.net 2008 so I used a Local SQL database i have tried to write some code to connect to it.
i will need further help on try to add the controls to edit the database but i will attempt that befor eposting for help. so here is my connection code i am trying to use a data grid to alow the data base to be edited.
also do I need to add the QNA table to data souces for it to be accessed ?[CODE...]
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Feb 26, 2009
I have some scripting exp in html, bash, sql, and am working my way through a video tutorial of VB, studio2008 and access 2008 are the apps, though I am thinking of switching to a freel sql application, as my sql skills are pretty decent, just need to rap them into VB.I am working on creating a winform application that will live on an employee's local laptop, that can be used for tracking troubleshooting incidents. The app will write data to local database first independent of internet connection, but can then upload changes to case data that have taken place since last sync, to the current web addressed server. Presently, we access case data through browser, but it is slow, and very tedious, and my idea is to create a stand alone app that can hopefully automate a lot of the tedious functions.. ie create cases from templates, etc..
So far, I created a layout that I thought would work well, by dragging and dropping from tool bar in Visual studio. I also created a database that can store data locally in access. Now, I am trying to figure out how to bind text boxes, month calendars, etc to the actual fields in the database. I am here for general advice, but specifically, I have a tab with a month calendar tool, and a data-grid view beneath it. I want the user, to be able to select dates, or date spreads on the calendar and have cases relative to those dates, display in the datagridview below.[code]and have the month calendar utility populate the case_dttm portion of the query.
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Jan 27, 2011
I'm currently under way with a computing project for 6th form and I have encountered a problem when working with a local database.
To give an overview:
-My program is intending to take in data on lorries, drivers and other sections of the haulage industry through multiple forms and afterwards be returned in a suitable manner.
-I have no trouble in reading data from my database that I have set up. However I am unable to write back to the database.
-I can add the relevant new data to either the specific table(Driver_Table in this case) of the Database1DataSet.xsd or to a table set up in this manner.
-My problem is with the Driver_TableTableAdapter.update method.
-When I call this it returns a value of 1 (for one row added) but does not write this to the database.
In specifics the particular section (created to test this section of code) is:
'Dim tbl As New Database1DataSet.Driver_TableDataTable
Driver_TableTableAdapter1.Fill(Database1DataSet1.Driver_Table)
' Driver_TableTableAdapter1.Fill(tbl)
[code].....
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Jun 21, 2010
I've been trying for hours to do this and can't figure it out.. I'm trying to add a new record to a table in my local database.. Heres the SQL code im using at the minute.. I keep getting this error
"The data was truncated while converting from one data type to another. [ Name of function(if known) = ]" on the line
SQLCom.ExecuteNonQuery() Dim SQLCon As New SqlServerCe.SqlCeConnection
Dim SQLCom As New SqlServerCe.SqlCeCommand
[code]....
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Oct 27, 2009
i have managed to add a database to my project its kind of a client database tells me their first, second name, email, date they last called etc etc anyway everything works fine it allows me to add, delete edit etc no problems.What i wanna do is on my main form i have a DateTimePicker1 if i select a date on the DateTimePicker1 how can i make it display last client calls in a RichTextBox?
[Code]...
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Dec 5, 2009
I'm posting this in the vb.net as I will be using visual studio to perform the task. So here is what I am trying to achieve or at least achieve it more efficiently than what I am doing now.
So I have two identical database setups, both with a table , let call it table tblUsers. The local database is edited through vb.net and is a Access database. The second database is hosted on a remote server and is a MySQL databse.
Currently I have no problem connecting and editing either database through vb.net. I'm using OLE DB to connect and handle the Access database and ODBC 5.1 to connect and handle the MySQL database.
Here is what I would like to do:
User opens the program Presses the "update local" button
The program updates the local database to whatever the remote database is The user uses the program to edit fields in the local database
When done, the user presses the "Update remote" button and the remote database fields that have been edited with the program in the local database will be updated to the remote database.
Currently, the only way for me to do this is to go line by line in a for next and use a command builder to compare each field and update that way.
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Jun 22, 2010
I'm trying to a open a connection to a local database and no matter what I try it just won't work (I'm pretty new to SQL Server and VB for that matter) I tried using 'sqlconnection' with different connection strings but none of them worked or gave me any useful error messages so I tried using 'OleDBConnection' instead, this hasn't worked either and it gives me this error instead:"A first chance exception of type 'System.NullReferenceException' occurred in MyProgram.exe"
Here is the code I am currently trying:
Private Sub MemDetailsSearch_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ConnectionString = ("Provider = Microsoft.Jet.OLEDB.4.0;" & "Data Source = Database.sdf")
DataConnect = New OleDbConnection(ConnectionString)
[code]....
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Jun 23, 2010
I have created an application using Visual Basic .NET, the application use an access data base which must be shared in server of a local network. The problem is when I run the application in a client machine (connected to the network) I can't connect to the data base.In the same machine the connection work which it's not the case when I change the location of the base to: Data Source="serverIPAdress/DataBase.mdb"
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