Hi, Joseph!
> As implementation I figured since the Lex is essentially a linked list
> I would traverse the Lex until the Select statements are reached and
> break the linked list. I would then make a List(Set Linked List) and
> call the set functions like it is doen normally. I would then find
> the Select functions and send to them. I figure during while
> traversing the Set statement I could copy the chain of variables that
> are to be Set this way before I send to the SET function I could
> retrieve the variables for GET to reset the values after I perform the
> SELECT. Does this sound logical or am I off in how the Lex is setup?
I'm confused. Where did you see that Lex is a linked list ?
SET stores variables in the Lex->var_list, that is in a list inside one
Lex, not in a list of Lex'es.
> I will finally start on the traversing the Lex today after I take care
> of a few chores. If you could point me into how to start the at the
> first item and pointer type would be helpful and save time. Is there
> are pointer *start -> item or no in the YYTHD
Traversing the Lex->var_list ? If yes - see below.
> Just a quick question is Lex->var_list a vector? As I see it uses
> .empty() and push_back . If that is the case I can go through it
> pretty quickly I think. Although given everything is pretty much
> linked lists used in mysql I would have thought it was a bunch of
> pointers in a linked list style. (even though a vector is likely a
> specialized linked list anyways being dynamic in size)
It's not an std::vector, if that's what you mean. MySQL doesn't use STL.
Lex->var_list is defined as
List<set_var_base> var_list;
and to iterate the list you use the following:
List_iterator_fast<set_var_base> it(*Lex->var_list);
set_var_base *var;
while ((var=it++))
{
... do something with 'var' ...
}
see sql_set_variables() for an example.
Regards / Mit vielen Grüßen,
Sergei
--
__ ___ ___ ____ __
/ |/ /_ __/ __/ __ \/ / Sergei Golubchik <serg@stripped>
/ /|_/ / // /\ \/ /_/ / /__ Principal Software Engineer/Server Architect
/_/ /_/\_, /___/\___\_\___/ Sun Microsystems GmbH, HRB München 161028
<___/ Sonnenallee 1, 85551 Kirchheim-Heimstetten
Geschäftsführer: Thomas Schroeder, Wolfgang Engels, Wolf Frenkel
Vorsitzender des Aufsichtsrates: Martin Häring
