From: Date: April 10 2006 6:56pm
Subject: Re: getting table meta data (primary key, in this case)
List-Archive: http://lists.mysql.com/internals/33508
Message-Id: <20060410165615.GY11975@w3.org>
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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.

Yep. mistake there.

> > 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();
>   }

Excellent! stuck this in a header:
  extern String Global_string; // call test->print(&Global_string); p Globa=
l_string.c_ptr(); call Global_string.free()

this in a .cc file:
  String Global_string;

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.

> Regards,
> Sergei
>=20

--=20
-eric

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