How can i read or import a mdb database file into postgresql?

regards
quickNitin

On Tue, 2006-07-25 at 16:51 +0530, nitin quick wrote:
> How can i read or import a mdb database file into postgresql?
sor
its years since Ive done it, so there might be fine detail to sort along
the way. but you can...

* Connect to postgres with odbc and link tables into mdb file then make
'append' queries in access
* Export to CSV from access then use the postgresql copy command to
import the csv data
* if your on *nix then you might be able to use kexi to do a query that
copies from the mdb file to postgres as I believe it handles both. There
are also other similar tools in the gnome stable I believe

>regards
> quickNitin

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> How can i read or import a mdb database file into postgresql?

From my experience, you will have to hand create new ddl (data definition language) statements
for the purpose of making new tables in postgresql that will mirror the tables in the access
database. I do not believe that it will be a simple "copy/paste" procedure.


However, I do believe this processes could be automated by creating a VBE script that would
generate DDL pass-though-queries to postgres by scanning all of the tables{columns, indexes,
constraints, and references), and queries.

Once this is completed you can export each table data into a csv file which will be copied into
the mirrored postgresql table using the copy command from psql. Alternatively, if you wanted to
automate this process, you could use VBE and the PostgreSQL ODBC driver to push data from the
access table to the postgresql tables using insert statements.

additionally I googled this topic and it returned a few useful links that you can use for further
ideas.
http://www.greenleaftech.net/article...to-postgresql/
http://www.data-conversions.net/prod...t=MENU&&ID=110
http://convert-access-to-postgresql.qarchive.org/


Regards,

Richard Broersma Jr.


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am 25.07.2006, um 16:51:46 +0530 mailte nitin quick folgendes:
> How can i read or import a mdb database file into postgresql?

Please read: http://techdocs.postgresql.org/#convertfrom


HTH, Andreas
--
Andreas Kretschmer (Kontakt: siehe Header)
Heynitz: 035242/47215, D1: 0160/7141639
GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net
=== Schollglas Unternehmensgruppe ===

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match

Post the folowing code as a new module in your Access database, then ececute
the "createsql" sub. It will create a new file of commands that can be
executed on the PostgreSQL server, that will create the tables and populate
them with the Access data. I got the idea from PGdump. I did not bother with
users and groups.

Regards David
------------------------------------------------------------------------------------------


Option Compare Database
Option Explicit
Public SetSequence As String
Const ForReading = 1, ForWriting = 2, ForAppending = 8
Const TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0
Public Schema As String


Sub CreateSQL()
Dim dbs As Database
Dim tdf As TableDef
Dim ConnectPath
Schema = LCase(Mid(CurrentDb.Name, InStrRev(CurrentDb.Name, "\") + 1,
InStrRev(CurrentDb.Name, ".") - InStrRev(CurrentDb.Name, "\") - 1))

' Schema = Mid(CurrentDb.Name, InStrRev(CurrentDb.Name, "\") + 1)

Set dbs = CurrentDb
For Each tdf In dbs.TableDefs ' Loop through all tables in the
database.
' If the table has a connect string, it's a
linked table.
If Len(tdf.Connect) > 0 Then SQL (LCase(tdf.Name))
Next
End Sub

Public Function SQL(TableName As String)
CreateTableCommand TableName
CreateInsertCommands TableName
If Not SetSequence = "" Then
Dim outfile As String
outfile = "Sql" & TableName & ".txt"
Dim fs, F, ts, S, Field
Set fs = CreateObject("Scripting.FileSystemObject")
Set F = fs.GetFile(outfile)
Set ts = F.OpenAsTextStream(ForAppending, TristateUseDefault)
ts.write SetSequence
ts.Close
End If
End Function

Sub CreateTableCommand(TableName As String)
SetSequence = ""
Dim outfile As String
outfile = "Sql" & TableName & ".txt"
Dim outTable As String
' outTable = LCase(TableName) & "Access"
outTable = LCase(TableName)
Const ForReading = 1, ForWriting = 2, ForAppending = 8
Const TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0
Dim RS As Recordset
Set RS = CurrentDb.OpenRecordset(TableName)
Dim OutString As String
Dim Field As Field, firstfield As Boolean
firstfield = True
OutString = "CREATE TABLE " & Schema & "." & outTable & " ("
For Each Field In RS.Fields
If firstfield Then
firstfield = False
OutString = OutString & vbNewLine & Left(LCase(Field.Name) &
" ", 20)
Else
OutString = OutString & "," & vbNewLine & Left(LCase(Field.Name)
& " ", 20)
End If
Select Case Field.Type
Case Is = 3
OutString = OutString & "integer"
Case Is = 4
If AutoIncField(Field.Attributes) Then
OutString = OutString & "SERIAL"
SetSequence = SetSequence & "SELECT Setval('" & Schema
& "." & TableName & "_" & Field.Name & "_seq',max(" & Field.Name & ")) from
" & Schema & "." & TableName & ";" & vbNewLine
Else
OutString = OutString & "integer"
End If
Case Is = 10
If Field.Size = 1 Then
OutString = OutString & "char" ' Will
import to char
ElseIf Field.Size < 256 Then
OutString = OutString & "varchar(" & Field.Size &
")" ' Will import back to text
Else
OutString = OutString & "text" ' Will
import back to Memo
End If
Case Is = 8
OutString = OutString & "date"
Case Is = 1
OutString = OutString & "boolean"
Case Else
OutString = OutString & "text" ' Will import back to
memo - case else includes memo fields
End Select
If Not Field.defaultvalue = "" Then ' The DefaultValue
property doesn't apply to AutoNumber and Long Binary fields.
OutString = OutString & " Default '" & Field.defaultvalue & "'"
End If
Next
RS.Close
Set RS = Nothing
OutString = OutString & ");" & vbNewLine & vbNewLine
Dim fs, F, ts, S
Set fs = CreateObject("Scripting.FileSystemObject")
fs.CreateTextFile outfile 'Create a file
Set F = fs.GetFile(outfile)
Set ts = F.OpenAsTextStream(ForWriting, TristateUseDefault)
ts.write OutString
ts.Close

End Sub
Sub CreateInsertCommands(TableName As String)
Dim outfile As String
outfile = "Sql" & TableName & ".txt"
Dim outTable As String
' outTable = LCase(TableName) & "Access"
outTable = Schema & "." & LCase(TableName)
Dim fs, F, ts, S, Field
Dim firstfield As Boolean
Set fs = CreateObject("Scripting.FileSystemObject")
' fs.CreateTextFile "SqlCmds.txt" 'Create a file
Set F = fs.GetFile(outfile)
Set ts = F.OpenAsTextStream(ForAppending, TristateUseDefault)
Dim RS As Recordset
Set RS = CurrentDb.OpenRecordset(TableName)
Dim OutString As String, qw As String
While Not RS.EOF
OutString = "INSERT INTO " & outTable & vbNewLine & "VALUES ("
firstfield = True
For Each Field In RS.Fields
If firstfield Then
firstfield = False
Else
OutString = OutString & ","
End If
If IsNull(Field.Value) Or IsEmpty(Field.Value) Then
OutString = OutString & "Null"
Else
Select Case Field.Type
Case Is = 3
OutString = OutString & Field.Value
Case Is = 4
OutString = OutString & Field.Value
Case Is = 10
OutString = OutString & "'" & Replace(Field.Value,
"'", "\'") & "'"
Case Is = 8
If IsDate(Field.Value) Then
OutString = OutString & "'" & Year(Field.Value)
& "-" & Month(Field.Value) & "-" & Day(Field.Value) & "'"
Else
OutString = OutString & "Null"
End If
Case Is = 1
If Field.Value Then
OutString = OutString & "'true'"
Else
OutString = OutString & "'false'"
End If
Case Else
OutString = OutString & "'" & Replace(Field.Value,
"'", "\'") & "'"
End Select
End If
Next
OutString = OutString & ");" & vbNewLine
ts.write OutString
RS.MoveNext
Wend
RS.Close
Set RS = Nothing
ts.Close
End Sub
Function ConvertToDate(DS) As Date
If IsNull(DS) Or Len(DS) = 0 Then
ConvertToDate = "1/1/1800"
Exit Function
End If
Dim ddot As Integer, ydot As Integer, yy, mm, dd
ddot = InStr(DS, ".")
If ddot = 0 Then ddot = InStr(DS, "/")
If ddot = 0 Then ddot = InStr(DS, "-")
If ddot = 0 Then
ConvertToDate = "1/1/1800"
Exit Function
End If
ydot = InStr(ddot + 1, DS, ".")
If ydot = 0 Then ydot = InStr(ddot + 1, DS, "/")
If ydot = 0 Then ydot = InStr(ddot + 1, DS, "-")
If ydot = 0 Then
ConvertToDate = "1/1/1800"
Exit Function
End If
dd = Left(DS, ddot - 1)
mm = Mid(DS, ddot + 1, ydot - ddot - 1)
yy = Mid(DS, ydot + 1)
ConvertToDate = DateSerial(yy, mm, dd)

End Function
Function AutoIncField(nbr As Long) As Boolean
Dim NBRstr As String, v As Integer
AutoIncField = False
For v = 1 To 5
If v = 5 Then AutoIncField = nbr Mod 2
If nbr < 1 Then
Exit For
End If
nbr = Int(nbr / 2)
Next v
End Function






On 7/25/06, A. Kretschmer <andreas.kretschmer@schollglas.com> wrote:
>
> am 25.07.2006, um 16:51:46 +0530 mailte nitin quick folgendes:
> > How can i read or import a mdb database file into postgresql?
>
> Please read: http://techdocs.postgresql.org/#convertfrom
>
>
> HTH, Andreas
> --
> Andreas Kretschmer (Kontakt: siehe Header)
> Heynitz: 035242/47215, D1: 0160/7141639
> GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net
> === Schollglas Unternehmensgruppe ===
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>



--

David Chapman
David's Backyard Computing

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david.luckychap@gmail.com