[DB-SIG] DCOracle number handling still broken?

[Guenter Radestock]

On Thu, Apr 06, 2000 at 10:50:05AM -0400, Christopher Petrilli wrote:
> Guenter Radestock [guenter@ubka.uni-karlsruhe.de] wrote:
> 
> > Some time last year I converted to DCOracle, version 1.2.1 and now I see
> > this does not work anymore (doesn't give an error, either).  Aparantly,
> > DCOracle returns every number truncated to an integer (again: this would
> > work better with the old old oracledb.)  I found that where svrmgrl
> > returns 1.30436094, DCOracle will return (1,) as a result to the same
> > select.
> 
> Um, can you provide some insight into your schema?  We sniff at the
> data types returned by Oracle, and try to do the right thing.  The
> general number type format is:
> 
> 	NUMBER(p,s)
> 
> where 'p' is the precision (total number of digits) and 's' is the
> scale (or number of digits to the right of the decimal).  If 's' is
> *not* zero, then we return a floating point, otherwise we try and get
> Python int v. long right (basically if p > 9, then long).
> 
> I wonder if you just are using the Oracleism of NUMBER by itself,
> which is hard to know what it will return.

I do use the description "number" in my schema and I only store integer
values in the database itself.  Cursor.description after a select
returns the tuple (('AVG(AUSGELIEFERT-ERZEUGT)', 'NUMBER', 40, 22, 0, 0,
1),)     The problem must be with avg() here.  I find the following:

create table numtest (x number, y number(4), z number(4, 2));
insert into numtest values (1, 2, 3.4);
insert into numtest values (5, 6, 7.8);

>>> cu.execute('select * from numtest')
>>> cu.fetchone()
(1, 2, 3.4)
cu.description
(('X', 'NUMBER', 40, 22, 0, 0, 1), ('Y', 'NUMBER', 40, 22, 4, 0, 1),
('Z', 'NUMBER', 40, 22, 4, 2, 1))

>>> cu.execute('select avg(x), avg(y), avg(z) from numtest');
>>> cu.fetchone()
(3, 4, 5)
>>> cu.description
(('AVG(X)', 'NUMBER', 40, 22, 0, 0, 1), ('AVG(Y)', 'NUMBER', 40, 22, 0,
0, 1), ('AVG(Z)', 'NUMBER', 40, 22, 0, 0, 1))

-- 
Guenter Radestock, Universitaetsbibliothek Karlsruhe
guenter@ubka.uni-karlsruhe.de
http://www.ubka.uni-karlsruhe.de/~guenter