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Date: Wed, 24 Jun 2009 12:59:49 +0300
From: Niklas Holsti <niklas.holsti@tidorum.invalid>
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Subject: Re: Not visible
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Date: 2009-06-24T12:59:49+03:00
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Pietro Tornaindietro wrote:
> hi, i'm a newbie.
> 
> i'm using APQ.

Yes... and no, see below :-)

> 
> procedure aa33 is
>    use APQ.PostgreSQL, APQ.PostgreSQL.Client;
...
> exception
>    when Not_Connected =>
> 
> 
> and when i compile this code, gnat tells me " "Not_Connected" is not
> visible".
> 
> what's the problem?

The exception Not_Connected seems to be declared in the package 
APQ, which you do not "use". So either add "use APQ" to the 
use-clauses, or qualify the exception name:

    exception
       when APQ.Not_Connected =>

There is a difference here in the Ada language between the "with" 
clause and the "use" clause: when you "with" a child package, as in

    with APQ.PostgreSQL;

you implicitly "with" the parent, APQ. But when you "use" a child 
package, as in your

     use APQ.PostgreSQL, ...

the parent package APQ is not implicitly "used", so its entities 
are not visible without qualification by "APQ.xxx".

HTH,

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .