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Jun 18th, 2000, 11:04 AM
#1
Thread Starter
Hyperactive Member
I thought it would be simple and it may well be only I do not seem to be looking at the right objects.
I'm using VB6 and ADO (data environment 2.1 but it probably doesn't matter)
The reason I *think* I want to do this is to create a gui to allow the user to select a data source- like the ODBC datasource builder in control panel.
An application I have written using the
ConnectionString=Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\myDB.mdb;Persist Security Info=False
works fine on my dev box which is NT4 and has Office 2000 installed.
On a client machine, which is say Win98 with Office97, I have to specify
ConnectionString=Provider=Microsoft.Jet.OLEDB.3.51;Data Source=c:\myDB.mdb;Persist Security Info=False
Which is all fairly OK by me. I just want to do it for the user (currently I store this in an ini file).
A lead on question is: Can we access some of the built in MS Access tools such as compact?
Perhaps the best answer to my questions would be if someone could direct me to the correct place in MSDN or anywhere else for that matter to get my answers.
I thought it would be straight forward....What am I missing?
Any help appreciated
Regards
Paul Lewis
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Jun 18th, 2000, 11:13 PM
#2
Guru
You can use the Compact method via the Microsoft Jet And Replication Objects 2.x Library
You'll also need to use the Jet 4.0 provider, which means you'll have to distribute MDAC 2.1 or greater
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Jun 19th, 2000, 07:21 AM
#3
Thread Starter
Hyperactive Member
 Thanks and I also found out some more
Thanks for the replies. They were a great help!
I also found some answers (funny how we tend to find answers ourselves AFTER we open our mouths and display our ignorance)
I have usually found answers I need by searching old posts in this set of fora so for this reason I submit what I found out for others in my position in the future.
Firstly, I have never really used wizards provided with VB or JBuilder or VC++ etc but I think I may now start to at least look at them.
In VB6 (I presume all copies, but I have the Enterprise version) there is a nice dialog generator simply called "ODBC Login Dialog" and would you believe it, it has everything I ever needed.
Here I was looking high and low for the answers in technical documents and all the time it was sitting there waiting.
Here it is for those who do not otherwise have access to this handy set of functions... Of course I'm too lazy to write down the names and positions of the controls so instead I include the entire .frm file. I hope this helps others in the future.
Code:
VERSION 5.00
Begin VB.Form frmODBCLogon
BorderStyle = 3 'Fixed Dialog
Caption = "ODBC Logon"
ClientHeight = 3180
ClientLeft = 2850
ClientTop = 1755
ClientWidth = 4470
ControlBox = 0 'False
Icon = "frmODBCLogon.frx":0000
LinkTopic = "Form1"
MaxButton = 0 'False
MinButton = 0 'False
ScaleHeight = 3180
ScaleWidth = 4470
ShowInTaskbar = 0 'False
StartUpPosition = 2 'CenterScreen
Begin VB.CommandButton cmdCancel
Cancel = -1 'True
Caption = "Cancel"
Height = 450
Left = 2520
TabIndex = 13
Top = 2655
Width = 1440
End
Begin VB.CommandButton cmdOK
Caption = "&OK"
Height = 450
Left = 915
TabIndex = 12
Top = 2655
Width = 1440
End
Begin VB.Frame fraStep3
Caption = "Connection Values"
Height = 2415
Index = 0
Left = 120
TabIndex = 14
Top = 120
Width = 4230
Begin VB.TextBox txtUID
Height = 300
Left = 1125
TabIndex = 3
Top = 600
Width = 3015
End
Begin VB.TextBox txtPWD
Height = 300
Left = 1125
TabIndex = 5
Top = 930
Width = 3015
End
Begin VB.TextBox txtDatabase
Height = 300
Left = 1125
TabIndex = 7
Top = 1260
Width = 3015
End
Begin VB.ComboBox cboDSNList
Height = 315
ItemData = "frmODBCLogon.frx":000C
Left = 1125
List = "frmODBCLogon.frx":000E
Sorted = -1 'True
Style = 2 'Dropdown List
TabIndex = 1
Top = 240
Width = 3000
End
Begin VB.TextBox txtServer
Enabled = 0 'False
Height = 330
Left = 1125
TabIndex = 11
Top = 1935
Width = 3015
End
Begin VB.ComboBox cboDrivers
Enabled = 0 'False
Height = 315
Left = 1125
Sorted = -1 'True
Style = 2 'Dropdown List
TabIndex = 9
Top = 1590
Width = 3015
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "&DSN:"
Height = 195
Index = 1
Left = 135
TabIndex = 0
Top = 285
Width = 390
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "&UID:"
Height = 195
Index = 2
Left = 135
TabIndex = 2
Top = 630
Width = 330
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "&Password:"
Height = 195
Index = 3
Left = 135
TabIndex = 4
Top = 975
Width = 735
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "Data&base:"
Height = 195
Index = 4
Left = 135
TabIndex = 6
Top = 1320
Width = 735
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "Dri&ver:"
Height = 195
Index = 5
Left = 135
TabIndex = 8
Top = 1665
Width = 465
End
Begin VB.Label lblStep3
AutoSize = -1 'True
Caption = "&Server:"
Height = 195
Index = 6
Left = 135
TabIndex = 10
Top = 2010
Width = 510
End
End
End
Attribute VB_Name = "frmODBCLogon"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Declare Function SQLDataSources Lib "ODBC32.DLL" (ByVal henv&, ByVal fDirection%, ByVal szDSN$, ByVal cbDSNMax%, pcbDSN%, ByVal szDescription$, ByVal cbDescriptionMax%, pcbDescription%) As Integer
Private Declare Function SQLAllocEnv% Lib "ODBC32.DLL" (env&)
Const SQL_SUCCESS As Long = 0
Const SQL_FETCH_NEXT As Long = 1
Private Sub cmdCancel_Click()
Unload Me
End Sub
Private Sub cmdOK_Click()
Dim sConnect As String
Dim sADOConnect As String
Dim sDAOConnect As String
Dim sDSN As String
If cboDSNList.ListIndex > 0 Then
sDSN = "DSN=" & cboDSNList.Text & ";"
Else
sConnect = sConnect & "Driver=" & cboDrivers.Text & ";"
sConnect = sConnect & "Server=" & txtServer.Text & ";"
End If
sConnect = sConnect & "UID=" & txtUID.Text & ";"
sConnect = sConnect & "PWD=" & txtPWD.Text & ";"
If Len(txtDatabase.Text) > 0 Then
sConnect = sConnect & "Database=" & txtDatabase.Text & ";"
End If
sADOConnect = "PROVIDER=MSDASQL;" & sDSN & sConnect
sDAOConnect = "ODBC;" & sDSN & sConnect
MsgBox _
"To open an ADO Connection, use:" & vbCrLf & _
"Set gConnection = New Connection" & vbCrLf & _
"gConnection.Open """ & sADOConnect & """" & vbCrLf & vbCrLf & _
"To open a DAO database object, use:" & vbCrLf & _
"Set gDatabase = OpenDatabase(vbNullString, 0, 0, sDAOConnect)" & vbCrLf & vbCrLf & _
"Or to open an RDO Connection, use:" & vbCrLf & _
"Set gRDOConnection = rdoEnvironments(0).OpenConnection(sDSN, rdDriverNoPrompt, 0, sConnect)"
'ADO:
'Set gConnection = New Connection
'gConnection.Open sADOConnect
'DAO:
'Set gDatabase = OpenDatabase(vbNullString, 0, 0, sDAOConnect)
'RDO:
'Set gRDOConnection = rdoEnvironments(0).OpenConnection(sDSN, rdDriverNoPrompt, 0, sConnect)
End Sub
Private Sub Form_Load()
GetDSNsAndDrivers
End Sub
Private Sub cboDSNList_Click()
On Error Resume Next
If cboDSNList.Text = "(None)" Then
txtServer.Enabled = True
cboDrivers.Enabled = True
Else
txtServer.Enabled = False
cboDrivers.Enabled = False
End If
End Sub
Sub GetDSNsAndDrivers()
Dim i As Integer
Dim sDSNItem As String * 1024
Dim sDRVItem As String * 1024
Dim sDSN As String
Dim sDRV As String
Dim iDSNLen As Integer
Dim iDRVLen As Integer
Dim lHenv As Long 'handle to the environment
On Error Resume Next
cboDSNList.AddItem "(None)"
'get the DSNs
If SQLAllocEnv(lHenv) <> -1 Then
Do Until i <> SQL_SUCCESS
sDSNItem = Space$(1024)
sDRVItem = Space$(1024)
i = SQLDataSources(lHenv, SQL_FETCH_NEXT, sDSNItem, 1024, iDSNLen, sDRVItem, 1024, iDRVLen)
sDSN = Left$(sDSNItem, iDSNLen)
sDRV = Left$(sDRVItem, iDRVLen)
If sDSN <> Space(iDSNLen) Then
cboDSNList.AddItem sDSN
cboDrivers.AddItem sDRV
End If
Loop
End If
'remove the dupes
If cboDSNList.ListCount > 0 Then
With cboDrivers
If .ListCount > 1 Then
i = 0
While i < .ListCount
If .List(i) = .List(i + 1) Then
.RemoveItem (i)
Else
i = i + 1
End If
Wend
End If
End With
End If
cboDSNList.ListIndex = 0
End Sub
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