From: Date: April 11 2006 1:44am
Subject: Re: getting table meta data (primary key, in this case)
List-Archive: http://lists.mysql.com/internals/33509
Message-Id: <20060410234420.GX412@w3.org>
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On Mon, Apr 10, 2006 at 12:56:15PM -0400, Eric Prud'hommeaux wrote:
> On Mon, Apr 10, 2006 at 04:54:38PM +0200, Sergei Golubchik wrote:
> > Hi!
> >=20
> > First: please don't forget to cc: your questions to the list,
> > so that others could benefit from the knowlegde share too.
> > Also you can get faster replies, because more developers will see your
> > question and will have their chance to answer.
>=20
> Yep. mistake there.
>=20
> > > Also, while i'm strolling around MySQL in gdb, are there any
> > > toString-like methods to give a string representation of an
> > > expression complile tree ala :?
> > >   p sel->where->as_string()
> >=20
> >   Item::print()
> >=20
> > Though it uses String class, so I'm not sure you can call it from gdb
> > the way you want. You can try the following workaround:
> >=20
> >   String gdb_print_buf;
> >   char *Item::gdb_print()
> >   {
> >     print(&gdb_print_buf);
> >     return gdb_print_buf.c_ptr();
> >   }
>=20
> Excellent! stuck this in a header:
>   extern String Global_string; // call test->print(&Global_string); p Glo=
bal_string.c_ptr(); call Global_string.free()
>=20
> this in a .cc file:
>   String Global_string;
>=20
> and can call it repeatedly from gdb like so:
>   (gdb) call test->print(&Global_string)
>   (gdb) p Global_string.c_ptr()
>   $11 =3D 0x8df42a8 "(`Orders_0`.`id` =3D 2186)"
>   (gdb) call Global_string.free()
> where test is some Item.

used gdb's define command to create a shortcut function:
(gdb) define pr
>call $arg0->print(&Global_string)
>p Global_string.c_ptr()
>call Global_string.free()
>end

and tried it out:
(gdb) pr(s)
$19 =3D 0x8df4868 "`Orders_0`.`id`{?o}"


> > Regards,
> > Sergei
> >=20
>=20



--=20
-eric

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