I am attempting to connect to a SQL Server Express Database through VB.net. As I run my connect string I am getting an error. Here is the code that I am using to connect. It works fine for another SQL Server database, however it errors out with the sql server express database.
Imports System.Data
Imports System.Data.SqlClient
Public sqlCnn As SqlConnection
Dim strCONN As String = "Data Source=CAFS\ADEMERO;Initial Catalog=OurDB;User ID=sa;Password=PASSWORD1!"
Try
sqlCnn = New SqlConnection(strCONN)
sqlCnn.Open()
Return True
Catch ex As Exception
MessageBox.Show(ex.Message,
"Content Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Stop)
Return False
End Try
Any assistance you can lend would be a great help.
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Any idea on reconnecting lost connection automatically using vb.net (windows form) to mysql server.
I am planning to develop an application. To be specific, it is a timer for an internet cafe.
The case is if the server downloaded some updates and need to restart, the client pc will reconnect automatically when the server boot up. Any idea? Thanks
I'm using this code to connect:
Dim DatabaseName As String = "xxx"
Dim server As String = "xxx"
Dim userName As String = "xxx"
Dim password As String = "xxx"
If Not conn Is Nothing Then conn.Close()
conn.ConnectionString = String.Format("server={0}; user id={1}; password={2}; database={3}; pooling=false", server, userName, password, DatabaseName)
Try
conn.Open()
MsgBox("Connected")
Catch ex As Exception
MsgBox(ex.Message)
End Try
conn.Close()
Dim conn As MysqlConnection
conn = New Mysqlconnection()
conn.ConnectionString = "server=justhost.com; user id=*****; password=****; database=login"
Try
conn.Open()
Catch myerror As MySqlException
MsgBox("Error connecting to database!")
End Try
this code not working ? how to connect online phpmyadmin database use vb.net?
Have you tried installing this one?
http://dev.mysql.com/downloads/connector/net/
and after installing that, try to reconfigure your code try this.
Imports MySql.Data.MySqlClient
Dim Connection As MySqlConnection = New MySqlConnection()
Dim ConnectionString As String = "Server=SERVERNAME or the Database online link;Database=DATABASE;Uid=root;Pwd=password;"
Connection.ConnectionString = ConnectionString
Connection.Open()
//Execute here what ever you want just follow your heart <3
myConnection.Close()
I am trying to connect using vb.net (Visual studio 2013) to an MS Access Database 2007(.accdb) using codes. But something is wrong in my code and i can't figure it out.
the Database name is "localDatabase.accdb"
I didn't put any password on my database
I'm using a 64bit
Thanks in advance!
Here is my code:
Module Module1
Dim conn As New System.Data.Odbc.OdbcConnection
Public Sub ConnectToOdbc()
conn.ConnectionString = Provider=Microsoft.ACE.OLEDB.12.0;Data Source="C:\Users\MyPc\Documents\Visual Studio 2013\Projects\database\localDatabase.accdb"
Try
conn.Open()
Catch ex As Exception
MessageBox.Show("Failed to connect to data source")
Finally
conn.Close()
End Try
End Sub
End Module
this is just a hypothesis..
I am using ACE 12.0 now on my app, and it works fine. the different thing is the code try to use this..
Imports System.Data.OleDb
'instead of obdc
con = New OleDbConnection
con.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source = " & Path.Combine(Application.StartupPath, "YourDatabase.accdb")
'put your .accdb in your app folder
maybe the error is it can't find your .accdb file.
Change this line:
conn.ConnectionString = Provider=Microsoft.ACE.OLEDB.12.0;Data Source="C:\Users\MyPc\Documents\Visual Studio 2013\Projects\database\localDatabase.accdb"
to this:
conn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\MyPc\Documents\Visual Studio 2013\Projects\database\localDatabase.accdb"
ConnectionString as the name tell is a string, so you need to wrap it with double-quotes to be recognized as string by VB compiler.
UPDATE :
Also you need to change the connection object from Odbc to OleDb:
Dim conn As New System.Data.OleDb.OleDbConnection
super new to Visual Studios and i need some help with regards to connection to database.
I only have visual studios 2012 installed.
So I'm trying to create a simple sign up form, and storing the information into a table(created a local database for this with the table 'Users'.)
The problem is:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or is not accessible. Verify that the instance name is correct and that SQL Server name is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified.)
Er, so what should I do? :(
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim con As New SqlConnection
Dim cmd As New SqlCommand
Try
con.ConnectionString = "Data Source=|DataDirectory|\Database1.sdf;"
con.Open()
cmd.Connection = con
Dim sha1 As SHA1 = sha1.Create()
Dim password As Byte() = sha1.ComputeHash(Encoding.Unicode.GetBytes(password1.Text))
cmd.CommandText = "INSERT INTO users (username,password) VALUES('" & username1.Text & "','" & password1.Text & "');"
cmd.ExecuteNonQuery()
Catch ex As Exception
MessageBox.Show("Error : " & ex.Message, "insert data")
Finally
con.Close()
End Try
Thanks guys.
EDIT:
Sad to say , I dont have any SQLExpress here in my laptop. so Yeahhh.
This might happen due to the SQLExpress has been stopped...Try to start it manually by going to services
I´m experimenting troubles on a local connection to SQL Server 2008, it´s throwing me the next especific error:
A network-related or instance-specific error ocurred while establishing a connection to SQL Server. The server was not found or was not accesible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections (error 40)
I´ve tried with most of solutions concerning to SQL Services and Firewall Solutions, so i think the problem is specific in the source code, so it is:
Private Sub cargar_Combo(ByVal ComboBox As ComboBox, ByVal sql As String)
Dim strConexion As String = "Data Source=Angel-PC\SQLEXPRESS1;Initial Catalog=sistemaReferencias;Integrated Security=True"
Dim conexion As New SqlConnection(strConexion)
Try
conexion.Open()
Dim cmd As New SqlCommand(sql, conexion)
Dim da As New SqlDataAdapter(cmd)
Dim ds As New DataSet
da.Fill(ds)
ComboBox.DataSource = ds.Tables(0)
ComboBox.DisplayMember = ds.Tables(0).Columns(1).Caption.ToString
ComboBox.ValueMember = ds.Tables(0).Columns(0).Caption
Catch ex As Exception
MessageBox.Show(ex.Message.ToString, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Finally
If conexion.State = ConnectionState.Open Then
conexion.Close()
End If
End Try
End Sub
I know that the String connection is right, because i used it in another method, the error comes specifically at the "da.Fill(ds)" line, those are the basics
I really appreciate any help you can provide.
Go to your desktop. Right click and add a new text file, "test.txt".
Rename the text file to test.udl, you will get a warning, just accept it.
Double click test.udl, and you will have an interactive dialog to configure your connection string.
Once you have configured the connection string. Click save. The right click the test.udl file and open in notepad. This will give you the connection string that you need to put into your app.