On Nov 24, 2008, at 2:12 PM, Tk421 wrote:
Hello everybody.
I've got an vb aplication that uses an Access database. I'm trying
to convert the database to postgres. The conversion was done ok, but
i've got a little problem that i don't know how to solve. Let's see
if anyone can help me.
The conversion from access database to postgres worked fine.
Everithing it's ok. But now, when i use my database i've found a
problem with sequences. In the conversion, the "autonumeric" fields
from access have been converted to sequences, everithing ok in a
first view. The problem comes because the autonumeric fields in
access always return the last value of the table +1, but postgres
no. Postgres returns "lost" (i don't know how to call them) values.
An example.
This is an example of a table:
code | description
----- | ------------
1 | desc 1
2 | desc 2
6 | desc 6
7 | desc 7
In access if i execute "INSERT INTO table (description) VALUES
('desc 8'), the result row is 8 | desc 8
But in postgres the same query te result row is 3 | desc 8
My question is, can i do something to make ANY sequence to take
the last value from his associated table, and not a "lost" value?
Thank you very much
This sounds like if the start of the sequence is set incorrectly:
Try this : SELECT setval('NAME OF SEQUENCE', SOME_INTEGER, true);
btw, you should also not expect a specific value from the sequence
except that you will always get the next value from the sequence.
it's also generally a bad idea to do select max(someid)+1 from table.
The whole concept of a sequence is thus much better.
Ries
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