Need to set up a Database connection class to be used throughout a project

Posted on 2004-10-25
Last Modified: 2010-04-23
I am trying to create a Database Class to be used throughout a project.  I have written the following code.  I am more familiar with ASP coding then I am with and I am having trouble calling the class properly to be used within the from code.   The error that I am getting is (Type 'SqlConn.Conn' is not defined.').


---  Class Code

Public Class SqlConn
    Public Function Conn()
        Dim cnn = New ADODB.Connection
        cnn.ConnectionString = "Provider=SQLOLEDB.1;Password=xxx;Persist Security Info=True;User Id=xxx;Initial Catalog=xxx;Data Source=xxx"
        cnn.CursorLocation = ADODB.CursorLocationEnum.adUseClient
    End Function
End Class

----- Form Code

 Public Sub frmListServEmailer_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim rst As ADODB.Recordset
        Dim strQuery As String
       Dim cnn As SqlConn.conn


        rst = New ADODB.Recordset
        rst.CursorLocation = ADODB.CursorLocationEnum.adUseClient
        rst.LockType = ADODB.LockTypeEnum.adLockReadOnly
        strQuery = "Select idEmailType, fldEmailDescription as [Email Type] from tblEmailType order by idEmailType"
        rst = cnn.execute(strQuery)

        If rst.EOF Then
            rst = Nothing
                Me.lstEmailType.Items.Add(rst("Email Type").Value)
            Loop Until rst.EOF

            rst = Nothing
        End If
    End Sub

Question by:GabicusC
    1 Comment
    LVL 7

    Accepted Solution

    Here is a sample from one of my projects....see the LOOK HERE labels below

    Public Class clsDBConn
        'Returns the connection string being used to access SQL database
        Public Function getStrConn() As String
            Dim strConn As String

                   'PRODUCTION EDMAPPS2K1
            'strConn = "User ID=orm;Password=YOURPASSWORD;Initial Catalog=OUTSIDERENTALS;Data Source=EDMAPPS2K1"

            Return strConn
        End Function
    End Class

     'Variables and objects
            Dim cDB As clsDBConn = New clsDBConn 'Connection Class <----------LOOK HERE
            Dim strConn As String = cDB.getStrConn 'Get connection string for database <----------LOOK HERE
            Dim oConn As New SqlConnection 'SQL connection object
            Dim intReturnID As Integer 'Return ID from Stored Procedures
            Dim oComm As SqlCommand 'SQL Command object
            Dim bFail As Boolean = False 'Test for failure

            'Validate form has data
            If Me.txtUsername.Text = "" Then
                MsgBox("Please enter a User Name.")
                bFail = True
                If Me.txtPassword.Text = "" Then
                    MsgBox("Please enter a Password.")
                    bFail = True
                End If
            End If

            If bFail = False Then 'All is well
                'Connect to SQL server and validate login
                    'Pass connection string to SqlConnection
                    oConn.ConnectionString = strConn <----------LOOK HERE

                    'SQL Database statements
                    oComm = New SqlCommand
                    oComm.CommandType = CommandType.StoredProcedure
                    oComm.CommandText = "spValidateLogin"
                    oComm.Connection = oConn

                    'Send in parameters
                    oComm.Parameters.Add(New SqlParameter("@varUserName", SqlDbType.VarChar)).Value = Me.txtUsername.Text
                    oComm.Parameters.Add(New SqlParameter("@varPassword", SqlDbType.VarChar)).Value = Me.txtPassword.Text

                    'Return value from stored procedure
                    Dim sParam As SqlParameter
                    sParam = New SqlParameter
                    sParam.ParameterName = "@ReturnID"
                    sParam.SqlDbType = SqlDbType.Int
                    sParam.Direction = ParameterDirection.Output

                    'Open connection and execute oComm
                    oConn.Open() 'Open connection
                    oComm.ExecuteNonQuery() 'Execute stored procedure
                    intReturnID = oComm.Parameters("@ReturnID").Value 'Get Return value
                    oConn.Close() 'Close connection

                    'Analyze Return value for errors
                    If intReturnID < 0 Then 'All errors are less than 0
                        MsgBox("Invalid Login, please try again.")
                        Dim frmMain As frmMain = New frmMain
                        'Set the global variable for user logged in
                        _intUserID = intReturnID

                        'Open Main form and hide Login screen
                    End If

                Catch ex As Exception
                    MsgBox("Error connecting to SQL Server")
                    oConn.Close() 'Close connection
                End Try
            End If

            Me.Cursor = System.Windows.Forms.Cursors.Default
        End Sub

    End Class

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