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Re: Migration Wizard - Access 97 Autonumber

From: D Tim Cummings <timcu(at)mac(dot)com>
To: Dave Page <dpage(at)vale-housing(dot)co(dot)uk>
Cc: pgadmin-support(at)postgresql(dot)org
Subject: Re: Migration Wizard - Access 97 Autonumber
Date: 2003-07-16 08:21:04
Message-ID: 710AB0B1-B766-11D7-929C-0003934C7598@mac.com (view raw or flat)
Thread:
Lists: pgadmin-support
Thanks Dave,

I understand that numeric is a safer option than float8 for Currency 
fields, but in the type map editor I can't set the precision and scale. 
  If I use numeric without setting precision and scale, Access 97 sees 
the field as "text" which is definitely not what I want.  If I could 
set it to say numeric(15,4) then Access 97 would be much happier, and 
report the field as being double.  As it is I will go with float8 and 
live with the rounding problems.

I downloaded version 1.5.60 of pgAdmin II and the migration wizard but 
they wouldn't run.  So I went to www.microsoft.com/data to get the 
latest "MDAC".  This was more difficult than I thought, because their 
news items talked about MDAC 2.8 but their downloads had a whole bunch 
of different versions, in no particular order, some as SDKs, none of 
which were 2.8.  I went with MDAC 2.7 SP1 Refresh, whatever "Refresh" 
means.  Anyway I am pleased to report that after installing MDAC 2.7 
SP1 Refresh, pgAdmin II v 1.5.60 and the Migration Wizard worked like a 
treat and correctly mapped my Access 97 Autonumber fields to int4 data 
types in PostgreSQL.

The only other gotcha I found with the software was not to leave log 
level on full debug or it slowed everything down to a crawl.  Apart 
from that it has worked like a charm.

Tim Cummings


On Sunday, Jul 13, 2003, at 18:52 Australia/Brisbane, Dave Page wrote:

> Hi Tim,
>
> It's rumoured that D Tim Cummings once said:
>> I am trying to migrate an Access 97 database to PostgreSQL 7.3 using
>> pgAdmin 1.4.12 and the Migration Wizard 1.4.12.  I want to keep using
>> the Access 97 front end connected to the PostgreSQL backend.
>>
>> The default type mapping didn't work for me but I discovered that
>> mapping
>>   Boolean -> int2 (instead of bool) and
>>   Currency -> float8 (instead of money)
>> meant I needed no changes to my Access97 front end.
>
> float8 is not a good idea for monetary amounts as there may be rounding
> errors and other problems. numeric is a far safer option.
>> The problem I had was the Autonumber mapping.  By default Autonumber
>> maps to int8 which causes Access 97 to think all records in the linked
>> table are deleted.  If the PostgreSQL data type is changed to int4,
>> Access97 works fine.
>
> In the 1.5.60 version, the autonumber columns will map through the type
> map, so if they start off as a 4 byte integer, they shouold end up as 
> int4
> or whatever you have mapped in it's place.
> You can download from http://www.pgadmin.org/pgadmin2/downloads
>
> Regards, Dave.
>
>
>

-- 
_______________________________________________

D Tim Cummings,             tim(at)triptera(dot)com(dot)au
Triptera Pty Ltd             ACN    073 371 918
207 Hawken Drive             ABN 67 073 371 918
St Lucia QLD 4067            Ph +61 4 1877 8422
AUSTRALIA                    Fx +61 7 5543 4493
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