Thread: VB ODBC connection to Postgresql, DAO,ADO,RDO,DSN???

This snippit (below) is exactly what you need to connect (assuming you have
set up a system DSN after having installed the ODBC driver).  Use VB6, Ado
(2.7 for example) and the postgreSQL ODBC and you're off.  SQL constructs
are passed through exactly as shown below.  I've been doing it before this
database was ported to win and it has worked great all along.

Dim cn as New ADODB.Connection
Dim rs as New ADODB.Recordset

  'Open the connection
  cn.Open "DSN=PostgreSQL;UID=dave;PWD=password;"

  'Open the recordset
  rs.Open "SELECT relname FROM pg_class", cn

  'Loop though the recordset print the results
  While Not rs.EOF
    Debug.Print rs!relname
    rs.MoveNext
  Wend

  'Cleanup
  If rs.State <> adStateClosed Then rs.Close
  Set rs = Nothing
  If cn.State <> adStateClosed Then cn.Close
  Set cn = Nothing




-----Original Message-----
From: Typing80wpm@aol.com [mailto:Typing80wpm@aol.com]
Sent: April 30, 2005 1:10 AM
To: pgsql-general@postgresql.org
Subject: VB ODBC connection to Postgresql, DAO,ADO,RDO,DSN???

I was very pleased today, to be successful in connecting to the windows
postgresql server across our simple p2p connection. (It all had to do with
turning off the windows fire wall, after folks here helped me with the .conf
ip address settings, and listening).  What is nice is that I have sygate
free fire wall, which simply pops up and asks me if I want to allow the
postgres connecting activity. So I may connect and still have a firewall.
 
Now, the next phase of my problem, to make something useful happen.  I can
connect like a breeze with rekall, and edit tables, BUT, I havent the
foggiest notion how to write a python script in rekall to do what I really
want to do with my tables.
 
I dont really understand how rekall will help folks, if they dont have demo
examples to do the sort of thing i am attempting.
 
IF, we had money at work, and could afford Access, then I think I would be
all set, because I see how I can do a lot in Access VBA. But we cant afford
to get it at work. I happen to have it at home, because it came with my
Dell.
 
Now I DO have a copy of Visual Basic 6.x and I can easily connect to
Postgres with the application wizard, and data aware controls.  But what I
really want to be able to do is to have a simple form, with a button, and be
able, within the script of that button, to do sql passthrough to postgres,
and then manipulate the rows returned to me within the VBA.
 
BUT, it is very hard for me to discover the precise grammar for establishing
such a simple connection.   Below, I am posting what I have collected from
google of snippets which SEEM like the might do what I want....  But if
anyone has a working examle for me, I would be most grateful.  Or if you
know an easy way for me to do what I want in some kind of Pearl for
windows.  I dont need a form painter with navigation buttons.  What I need
is a script that I can put into a look, to look for a certain value in a
table,..... wait for a few seconds, look again, and when it FINDS that row
with that field value,... then do some things, delete that record or mark it
somehow... and go back into more waiting and looking, until the next
row/field value appears.  It could be selecting on a very small table with
just a few rows.  THe idea is that another workstation would add a row to
the table which would cause THIS workstation to read it, and display
something on the screen.   So... take a look below, and you will see the
sort of thing I am trying to do.
 
I think if I had Powerbasic or Realbasic, then perhaps I could more easily
do what I want, but I just dont have the money right now to run out and buy
a lot of things.   I also have Visual FOxpro version 5, and I thought I
could work with that, but, it is having trouble connecting to postgres via
odbc...
 
- Thanks
--------------------------=========snippets of VB code
 
 
 
http://archives.postgresql.org/pgsql-odbc/2003-07/msg00041.php
 
Sub PreConnect(strUserName As String, strPassword As String,
strDatabase As String)
 
    Dim wrkRemote As Workspace, dbsRemote As Database
    Dim strConnect As String
 
    strConnect = "ODBC;DSN=PostgreSQL;DATABASE=" + strDatabase
 
+
";SERVER=pgserver;PORT=5432;UID=" + strUserName + ";PWD=" +
strPassword +
";READONLY=0;PROTOCOL=6.4;FAKEOIDINDEX=0;SHOWOIDCOLUMN=
 
0;ROWVERSIONING=0;SHOWSYSTEMTABLES=1;CONNSETTINGS="
 
    Set wrkRemote = DBEngine.Workspaces(0)
    Set dbsRemote = wrkRemote.OpenDatabase("", False, False,
 
strConnect)
    dbsRemote.Close                 ' Close database but keep connection.
 
End Sub
 

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dn
 
vbpj00/html/sqlado.asp
 
While Not Adodc1.Recordset.EOF
    Debug.Print Adodc1.Recordset!company
    Adodc1.Recordset.MoveNext
  Wend
 

Dim m_connect as new adodb.connection
 
M_connect.connectionstring = "File Name c:\myfolder\mydata.mdb"
 
M_connect.open
 

+++++
Dim cn as New ADODB.Connection
Dim rs as New ADODB.Recordset
 
  'Open the connection
  cn.Open "DSN=PostgreSQL;UID=dave;PWD=password;"
 
  'Open the recordset
  rs.Open "SELECT relname FROM pg_class", cn
 
  'Loop though the recordset print the results
  While Not rs.EOF
    Debug.Print rs!relname
    rs.MoveNext
  Wend
 
  'Cleanup
  If rs.State <> adStateClosed Then rs.Close
  Set rs = Nothing
  If cn.State <> adStateClosed Then cn.Close
  Set cn = Nothing
 

++++++++++++++
Dim m_connect as new adodb.connection
  Dim db As new adodb.connection
  Set db = New Connection
  db.CursorLocation = adUseClient
  db.Open
 
"PROVIDER=MSDASQL;dsn=PostgreSQL;uid=neil;pwd=password;data
 
base=bpsimple;"
 
  Set adoPrimaryRS = New Recordset
  adoPrimaryRS.Open "select
 
customer_id,title,fname,lname,addressline,town,zipcode,phone from
 
customer Order by fname", db, adOpenStatic, adLockOptimistic
 
  'Loop though the recordset print the results
  While Not adoPrimaryRS.EOF
    Debug.Print adoPrimaryRS!lname
    adoPrimaryRS.MoveNext
  Wend
 
 
 
 
 
Private Sub adoPrimaryRS_MoveComplete(ByVal adReason As
 
ADODB.EventReasonEnum, ByVal pError As ADODB.Error, adStatus As
 
ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
  'This will display the current record position for this recordset
  lblStatus.Caption = "Record: " &
 
CStr(adoPrimaryRS.AbsolutePosition)
End Sub
 
Private Sub adoPrimaryRS_WillChangeRecord(ByVal adReason As
 
ADODB.EventReasonEnum, ByVal cRecords As Long, adStatus As
 
ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
  'This is where you put validation code
  'This event gets called when the following actions occur
  Dim bCancel As Boolean
 
 
 
Private Sub cmdAdd_Click()
  On Error GoTo AddErr
  With adoPrimaryRS
    If Not (.BOF And .EOF) Then
      mvBookMark = .Bookmark
    End If
    .AddNew
    lblStatus.Caption = "Add record"
    mbAddNewFlag = True
    SetButtons False
  End With
 
  Exit Sub
AddErr:
  MsgBox Err.Description
End Sub
 
Private Sub cmdDelete_Click()
  On Error GoTo DeleteErr
  With adoPrimaryRS
    .Delete
    .MoveNext
    If .EOF Then .MoveLast
  End With
  Exit Sub
 
Private Sub cmdRefresh_Click()
  'This is only needed for multi user apps
  On Error GoTo RefreshErr
  adoPrimaryRS.Requery
  Exit Sub
RefreshErr:
  MsgBox Err.Description
End Sub
 
Private Sub cmdEdit_Click()
  On Error GoTo EditErr
 
  lblStatus.Caption = "Edit record"
  mbEditFlag = True
  SetButtons False
  Exit Sub
 
EditErr:
  MsgBox Err.Description
End Sub
Private Sub cmdCancel_Click()
  On Error Resume Next
 
  SetButtons True
  mbEditFlag = False
  mbAddNewFlag = False
  adoPrimaryRS.CancelUpdate
  If mvBookMark > 0 Then
    adoPrimaryRS.Bookmark = mvBookMark
  Else
    adoPrimaryRS.MoveFirst
  End If
  mbDataChanged = False
 
End Sub
 
Private Sub cmdUpdate_Click()
  On Error GoTo UpdateErr
 
  adoPrimaryRS.UpdateBatch adAffectAll
 
  If mbAddNewFlag Then
    adoPrimaryRS.MoveLast              'move to the new record
  End If
 
  mbEditFlag = False
  mbAddNewFlag = False
  SetButtons True
  mbDataChanged = False
 
  Exit Sub
UpdateErr:
  MsgBox Err.Description
End Sub
 
Private Sub cmdClose_Click()
  Unload Me
End Sub
 
Private Sub cmdFirst_Click()
  On Error GoTo GoFirstError
 
  adoPrimaryRS.MoveFirst
 
 
 

  adoPrimaryRS.MoveLast
 
 
 
  If Not adoPrimaryRS.EOF Then adoPrimaryRS.MoveNext
  If adoPrimaryRS.EOF And adoPrimaryRS.RecordCount > 0 Then
    Beep
     'moved off the end so go back
    adoPrimaryRS.MoveLast
  End If
 

  If Not adoPrimaryRS.BOF Then adoPrimaryRS.MovePrevious
  If adoPrimaryRS.BOF And adoPrimaryRS.RecordCount > 0 Then
    Beep
    'moved off the end so go back
    adoPrimaryRS.MoveFirst
  End If
 
====================end of snippets of VB code