ref_ptr<statement> fetch(std::string const &query)
{
ref_ptr<statement> st;
statements_type::iterator p = statements.find(query);
if(p==statements.end())
return st;
st=p->second.stat;
lru.erase(p->second.lru_ptr);
statements.erase(p);
size --;
return st;
}
void insert(ref_ptr<statement> st)
{
statements_type::iterator p;
if((p=statements.find(st->sql_query()))!=statements.end()) {
p->second.stat = st;
lru.erase(p->second.lru_ptr);
lru.push_front(p);
p->second.lru_ptr = lru.begin();
}
else {
if(size > 0 && size >= max_size) {
statements.erase(lru.back());
lru.pop_back();
size--;
}
std::pair<statements_type::iterator, bool> ins =
statements.insert(std::make_pair(st->sql_query(), entry()));
p = ins.first;
p->second.stat = st;
lru.push_front(p);
p->second.lru_ptr = lru.begin();
size ++;
}
}
