I've already finished the program and the last task was to add a password for my MS Access database. I've created the password in Ms Access and I've already modified the connection and saved the password but when I run the program all codes like this
Me.Table1TableAdapter.Fill(Me.Database1DataSet.Table1)got an error message says Not a valid password.
Having problem in updating an existing record. An error occurs "Data Type Mismatch in Criteria Expression"
Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
Dim myBuilder As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(dataAdapter)
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i was wondering is there a build in class in vb.net for get a range of dates from a column:What i mean is say i had the following dates in a column
10/03/2012
11/01/2011
14/05/2011
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i've been trying to figure out how to update a row in my database, using a set of fields from the current form. The code which i have made so far is shown below, however it always comes up with an error message:
Private Sub btnupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnupdate.Click
Dim SQL As String
Dim updatelogin As New OleDbCommand
Try
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I have built a search criteria for a table in my database. I have 3 textboxes first says anstnr second says firstname and the third lastname.The problem is that i cannot search if first field "anstnr" is blank. If i only will search on firstname thats not working.
Private Sub FillByolikaToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FillByolikaToolStripButton.Click
Try
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I want to search record in the database and if the record all ready in the database something do. I use this code but it is not work
Str SQL = "SELECT* FROM student WHERE stdno = '"& txtstdno.Text &"'"
oledbcon.open()
ry
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thr are 02 fields username,pasword in database also two textboxes in vb.net form for username and pasword ... i need coding of if else which confirms that, if (username,pasword ) = username,pasword of atabase then
View 7 RepliesHow we can show data from acess database in datagrid
View 1 RepliesI'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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I've got a question below:load data from a table in database into a datagridview,make change in datagridview,and use update function to update change back to tablebut 13 changes, only 12 being update back to databaseonly the top row on the datagridview not being update??
For Each orow As DataGridViewRow In DataGridView1.Rows
orow.Cells(1).Value = TextBox1.Text
Next
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Im trying to effectively, Save a listviews items to A database (after clearing it) then load it all back in to the listbox, would this do it? becuase it just doubles what ever is in the listbox @ the time,
Dim ConnStr As String = "Provider = Microsoft.Jet.OLEDB.4.0; Data Source = " + System.Windows.Forms.Application.StartupPath + "data.mdb"
Dim DT As New DataTable()
Dim SQLStr As String = "DELETE * FROM [keys]"
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Not entirely sure where I've gone wrong with this, basically the problem is I have an access database linked and currently I can create new entries successfully but when I edit a record and the user attempts to save back to the database it throws up the below error.[code]...
View 4 RepliesI have an application that monitors a set of opc boolean tags.When a tag changes from false to true (triggered), the application is supposed to query the database for data recording during a specific time period.I had the app done or so i thought until i realized that the background worker that i dimension to do the query is not firing the runworker completed event.at the start of the app, I create a new class for each trigger config in an xml file. Each trigger class has its own opc monitor and handle specific for that one boolean tag.If a tag changes to true a NEW instance of the query class is created.A new background worker instance is dimensioned to do the actual work.(this because there is a pre trigger query and a post trigger query which could be up to 24 hrs after the event has been "triggered" to true and the bg worker will wait until the required amount of time has completed before doing the post query).When the bg worker has completed, it should dispose of itself and all its managed resources.
The very first tag that changes to true will function as expected but when it is complete the RunWorkerCompleted will not fire. Everyone there after will operate as expected but not the very first one.I couldnt figure out why so I started commenting out some code.If I remove the line to create a new oracle connection, it works. [code]
I am trying to connection to MS SQL SERVER 2008 database (students), i want to make sure:
1) If connection string that i made is OK
Dim connectionString As New SqlConnection("server=X86ONX64; database=students; Integrated Security=True")
2) How can i check if dataset is producing any results?
Code:
Public Class Form1
'Connection String + DataAdaptor + DataSet
'Declared Outside Any Subroutines/Functions
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connect to MySQL to create a database in visual Basic 2008
View 11 RepliesI am new to VB programming, installed VB 2008 express and am working with the examples provided in the "Learn VB" link.When creating a project that contains a form and a connection to a database the "test connection" is successful, but when I start debugging I get the followiong error message:"unable to load DLL 'sqlceme35.dll'
View 2 RepliesI'm trying to connect to my MySQL database I have online at (mywebsite.com), however it just hangs for about 30 seconds and says and does nothing.
Dim sConnection As String = "Server=mywebsite.com;Database=mydatabase;Uid=myusername;Pwd=mypassword;"
Dim scConnection As New SqlConnection(sConnection)
Dim scCommand As New SqlCommand("SELECT * FROM mytable WHERE user = @user AND password = @pass", scConnection)
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I'm guessing the connection string is wrong, I'm going to try the server as localhost, but in the mean time hopefully someone might see what I might be doing wrong.I'd also like to look into doing it asynchronously, so the UI doesn't freeze,
I created a new Setup project to my original project. In my project's code there is this line: Public DBPath As String = My.Computer.FileSystem.SpecialDirectories.MyDocuments & "Visual Studio 2008ProjectsFUV1FUV1FU.mdb" I just wanted to know, if I am instaling the project in other computer that has no VS in it, with the SETUP project, do I need to change this line? something to do with the Application Folder of the Setup project?
View 1 RepliesI am trying to open an Oracle database connection in vb.net 2008 in order to issue a Select statement and the populate a listbox with it.
My code is as follows:
Dim orclstr As String = _
"Provider=OraOLEDB.Oracle;" & _
"Data Source=10.0.0.77;" & _
"User ID=myuser;" & _
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Obviously, I am doing something wrong, but I can't figure out what.
how i can create a connection to a database when i open my program and then close that connection when the program closes, so that the user has a permanent connection while the program is running that can be used for multiple things depending on what the user decides to do.
View 5 Replies1.Establishing a connection to a database(preferably one that is inherit within the project and can travel with it)
2. Setting the correct references to the database ( I tried connecting via JET with windows 7 and I get an error that I cannot use JET)
3. Query the database (Access) with SQL, and return those results to a recordset.
4. Loop through the recordset.
5. close the database connection
6. Open recordset and write data to table.
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I know this topic has been addressed a million times but please help me out. I have read so many articles on HOW TO encrypt and decrypt the app.config file but I need to know WHEN and WHERE I should encrypt it.
The problem arose because we found an AppName.exe.config file on a users computer and the database username and password was clearly visible. I understand that the .config file gets created during the VB app install process and is used
by the application. I then learned about the aspnet_regiis.exe tool and ran it on the app.config file inside my VB project. I am guessing that was the wrong thing to do.
When I now install the app on user desktops, it gives an error stating failed to decrypt the connection string. Also, when one of my other developers attempts to open the project in his copy of visual studio on his computer, he receives an error when trying to access the setting portion of the project properties. We store all of our projects on a file server and any developer can access the projects via a mapped drive on their computer.
So how am I supposed to encrypt the .config file. If I can't encrypt the App.config file in the development environment, then I'm guessing I have to perform the encryption on the users PC during the install process? How do I do that? Or is that what I am supposed to do?
Just for reference, here is the aspnet_regiis command I ran.
aspnet_regiis.exe -pef "connectionStrings" S:ProjectsDevelopmentVB.netPTPUSourceCodePTPU -prov "DataProtectionConfigurationProvider"
One last thing, maybe it's my misunderstanding of the issue but if this problem has existed since .Net 2.0, why has an option not been built into the development studio to encrypt connection strings?. This would seem to be a very common issue, even their own dataset wizard creates connection strings that are clearly readable.
I have a piece of code connecting to my database retrieving data. I was just testing the form on another computer and everytime it loads this specific form it closes the form.You can see the lines I had to comment out in order for the form to NOT close on load. Is there something possibly that needs to be installed on this other computer? running XP pro 32 bit.
Dim conn As OleDbConnection
Dim comm As OleDbCommand
Dim dr As OleDbDataReader
Dim connectionString As String
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I have some software that grabs information from a mysql server. However, users minimize it to the system tray, and leave it idle for hours until using it again.If a user leaves the program idling for about 15 minutes, then goes into the program again to perform a query, it throws a Fatal Error in the mysql, and says 'connection must be valid and open'
The reason is simply because the mysql connection has timed out..I was wondering what the code would be to re-connect to the server IF it has timed out.
Is 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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I am storing my connection string in my app.config file. I am using sql server express 2005. The connection string on my dev machine is different from the ones at the clients. so each time I update I open the config file and edit the connection string setting. This is quite a pain.also I have now published my app to an ftp folder so that the clients can get the updates each time I make changes. saves me the hassle of going to them each time i update. so now i need it to be so that I won't have to change the setting all the time.Would the best way be to store the connection string in a settings table in the database?
View 6 RepliesI have attached Database to my vb.net application. Client has sql server 2008 express installed.I built my application and gave to him. he is encountering errors.
PHP
"Data Source=.SQLExpress;Database=xx.mdf;Trusted_Connection=True;Integrated Security=False"
i am getting Cannot Open Database for requested Login. Login Failed. i am using SQL 2008 server Developer edition. And using Windows Authentication mode.
When using SQL connections in my program, will I have to open and close the connection and the data reader each time I want to access the database ?
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can anyone teach me how to save data in microsoft access database and retrieving it back from database?[code]so, how do i save it in that and how do i load their data by typing their ic no only..
View 5 Replies