Problem with cakephp 1.3.8 + oracle with sequences

Hello

Sorry for this newbie question but inside a controller I've have three
continuous calls a oracle sequence nextval.

for example:
$opd = $this->Usuario->query("select
pn_object_sequence.nextval from dual");
pr($opd);
$pid[1] = $opd['0']['0']['dual'];
$opd = $this->Usuario->query("select
pn_object_sequence.nextval from dual");
pr($opd);
$pid[2] = $opd['0']['0']['dual'];
$opd = $this->Usuario->query("select
pn_object_sequence.nextval from dual");
pr($opd);
$pid[3] = $opd['0']['0']['dual'];

Well,the problem is shown by the pr :
Array
(
[0] => Array
(
[0] => Array
(
[dual] => 1146948
)

)

)

Array
(
[0] => Array
(
[0] => Array
(
[dual] => 1146948
)

)

)

Array
(
[0] => Array
(
[0] => Array
(
[dual] => 1146948
)

)

)

As you see I always take the first call value.
I'm not sure if it is related to some cache or how can I avoid this
because,
I really need 'to pass' the sequence itself.

Thank you in advance for your ideas.

JB

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