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
Related
I am doing a project for class. I am using reportviewer to pull data from a dataconnection named fitnesscompanydb.accdb . It keeps throwing this error now.
System.Data.SqlClient.SqlException: 'A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)'
Public Class frmSignupReportQuery
Private Sub frmSignupReportQuery_Load(sender As Object, e As EventArgs)
Handles MyBase.Load
Dim startingdate As String = frmSignupReport.SignupDateStart.Text
Dim endingdate As String = frmSignupReport.SignupDateEnd.Text
Dim strConnectionString As String = "Data Source=(local)" '; Initial
Catalog=fitnessCompanyDB.accdb; "
Dim ds As New DataSet()
Dim da As New SqlDataAdapter()
Dim cmd As New SqlCommand("SELECT * FROM Memberbase WHERE
Memberbase.Signupdate = BETWEEN #" & startingdate & "# and #" & endingdate &
"#")
cmd.CommandType = CommandType.Text
cmd.Connection = New SqlConnection(strConnectionString)
da.SelectCommand = cmd
da.Fill(ds, "DataSet1")
Dim rds As New ReportDataSource("DataSet1", ds.Tables(0))
Me.ReportViewer1.LocalReport.ReportPath = "#\SignupReport.rdlc"
Me.ReportViewer1.LocalReport.DataSources.Clear()
Me.ReportViewer1.LocalReport.DataSources.Add(rds)
Me.ReportViewer1.RefreshReport()
End Sub
End Class
I understand that it is probably throwing this error because it cannot find the file because it is not named correctly. How do i add the correct file location so it can locate it?
I am connecting to the MS Access server with the following code.
Dim cnn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=162.222.225.78;Database=CRM.mdb;Integrated Security=SSPI;User ID=corpopef;Password=********;")
Dim cmd As New OleDb.OleDbCommand
If Not cnn.State = ConnectionState.Open Then
cnn.Open()
End If
cmd.Connection = cnn
cmd.CommandText = "INSERT INTO Addressbook(srno) " & _
"VALUES('" & Me.TextBox1.Text & "')"
cmd.ExecuteNonQuery()
But it results in the following error:
"Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done."
Please suggest to me some methods to work around this problem.
Thanks in advance...!
The connection string you used seems like an SQL client connection string. For an access database, you should use this format:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=path_to_mdb_file\CRM.MDB;User Id=user_id; Password=password;
I have already posted one question about this piece of code before lol. But now I am having a different problem and need help with it. Basically this is code for a search button on a Windows Form coded in VB.NET.
Private Sub SearchButton_Click(sender As Object, e As EventArgs) Handles SearchButton.Click
Dim cnnOLEDB As New OleDbConnection
Dim cmdOLEDB As New OleDbCommand
Dim strConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & System.Environment.CurrentDirectory & "\All Keyed Up, Lock & Safe, LLC.accdb"
cnnOLEDB.ConnectionString = strConnectionString
cnnOLEDB.Open()
Dim Connection As New SqlClient.SqlConnectionStringBuilder
Connection.DataSource = "file:///C:\Users\thelukester145\Documents\All%20Keyed%20Up\All%20Keyed%20Up,%20Lock%20&%20Safe,%20LLC.accdb"
Dim objSQLConnection = New SqlClient.SqlConnection(Connection.ConnectionString)
Dim cmd As New SqlCommand()
Dim myTable As New DataTable()
Dim SearchFor = SearchBox.Text
If AddressButton.Checked Then
cmd.Connection = objSQLConnection
cmd.CommandText = "SELECT * FROM [McDonald's-Corporate Stores] WHERE [Address] LIKE '%" & SearchFor & "%'"
Dim myAdapter As New SqlDataAdapter(cmd)
myAdapter.Fill(myTable)
DataGrid.DataGridView1.DataSource = myTable
ElseIf NumberButton.Checked Then
cmd.Connection = objSQLConnection
cmd.CommandText = "SELECT * FROM [McDonald's-Corporate Stores] WHERE [McOpCo#] LIKE '%" & SearchFor & "%'"
Dim myAdapter As New SqlDataAdapter(cmd)
myAdapter.Fill(myTable)
DataGrid.DataGridView1.DataSource = myTable
End If
DataGrid.Show()
cnnOLEDB.Close()
End Sub
The database that is attempting to be searched is a database of customers for our family buisness. I am trying to search by either the address or store number of our customer. I've worked through who knows how many fatal errors but the newest one has me sort of stumped. It is crashing on myAdapter.Fill(myTable). The error message it gives is this:
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)
Any help would be much appreciated :)
Well, you are freely mixin OleDb classes with SqlClient classes. The two are for different database types. OleDb is needed for Access, SqlClient classes are used for Sql Server.
So you need to change all the classes SqlCommand, SqlCommandBuilder, SqlDataAdapter,SqlConnectionStringBuilder with the corresponding classes OleDbCommand, OleDbCommandBuilder, OleDbDataAdapter, OleDbConnectionStringBuilder
Infact, the error message is emitted by the SqlClient library that tries to use your connection string as it was a connectionstring for an SQL Server database and, of course, it fails to find it.
Also, I am not sure about that, but probably the DataSource property doesn't need the prefix file:/// and the Encoding of spaces with %20
ok first ill explain what ive done.
First I imported an access db into my vb app it then named the dataset etc.
this is how my dataSet looks:
1 table
4 columns
so Far i have this:
Dim ds As ElementsDataSet
Dim dt As ElementsDataSet.ElementsDataTable
Dim conn As SqlConnection = New SqlConnection("Data Source=|DataDirectory|\Elements.accdb")
Dim selectString As String = "Select Atomic Mass FROM Elements WHERE No =" & mol
Dim cmd As New SqlCommand(selectString, conn)
If conn.State = ConnectionState.Closed Then conn.Open()
Dim datareader As SqlDataReader = cmd.ExecuteReader()
While datareader.Read = True
MessageBox.Show(datareader.Item("Atomic Mass"))
End While
datareader.Close()
and upon executing this I get this error:
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
The problem is you are using a SQLConnection to open a Access database. This wont work.
You either need a SQLServer database or to use the OleDbConnection for a Access database.
Here is a Microsoft KB article to help you connect to the Access database:
How To Retrieve and Display Records from an Access Database by Using ASP.NET, ADO.NET, and Visual Basic .NET and this one over at CodeProject: http://www.codeproject.com/Articles/8477/Using-ADO-NET-for-beginners
Private Sub ReadRecords()
Dim conn As OleDbConnection = Nothing
Dim reader As OleDbDataReader = Nothing
Try
conn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Temp\Elements.accdb"))
conn.Open()
Dim cmd As New OleDbCommand("Select Atomic Mass FROM Elements WHERE No =" & mol, conn)
reader = cmd.ExecuteReader()
While reader.Read = True
MessageBox.Show(reader.Item("Atomic Mass"))
End While
Finally
If reader <> Nothing Then
reader.Close()
End If
If conn <> Nothing Then
conn.Close()
End If
End Try
End Sub
I have a search button to search the database by a name entered in a text box, this is working fine within visual studio but when trying to use this in the hosted version i get the following message:
Server Error in '/' Application.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
the code for this button is:
GridView2.Visible = True
lblEnterName.Text = ""
If txtLoanName.Text = "" Then
lblEnterName.Text = "Please enter a Bandie's Name"
Else
Dim conn As SqlConnection = Nothing
Try
Dim connString As String = "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\BandDatabase.mdf;Integrated Security=True;User Instance=True"
conn = New SqlConnection(connString)
Dim query As String = "SELECT [SongName], [PartLearnt], [Status] FROM [Learning] WHERE ([BandieName] LIKE '%' + #Name + '%') ORDER BY [SongName]"
Dim cmd As SqlCommand = New SqlCommand(query, conn)
cmd.Parameters.AddWithValue("#Name", txtLoanName.Text)
conn.Open()
Dim dr As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)
Dim dt As DataTable = New DataTable()
dt.Load(dr)
GridView2.DataSource = dt
GridView2.DataBind()
lblSearchBandieName.Text = "Progress for " + txtLoanName.Text
Finally
conn.Close()
End Try
End If
I am unsure why this is bringing the error as didnt before, all i have done is changed the page the button is on.
Thanks
did you check the information in the connection string? probably not an sqlexpres on the hosted solution. Also you may want to have the connection info in the web.config
Now as an answer....: -)