size_t middle_ram_t::ways_get_list(const idlist_t &ids, idlist_t &way_ids,
multitaglist_t &tags, multinodelist_t &nodes) const
{
if (ids.empty())
{
return 0;
}
assert(way_ids.empty());
tags.assign(ids.size(), taglist_t());
nodes.assign(ids.size(), nodelist_t());
size_t count = 0;
for (idlist_t::const_iterator it = ids.begin(); it != ids.end(); ++it) {
if (ways_get(*it, tags[count], nodes[count])) {
way_ids.push_back(*it);
count++;
} else {
tags[count].clear();
nodes[count].clear();
}
}
if (count < ids.size()) {
tags.resize(count);
nodes.resize(count);
}
return int(count);
}
size_t middle_pgsql_t::ways_get_list(const idlist_t &ids, idlist_t &way_ids,
multitaglist_t &tags, multinodelist_t &nodes) const {
if (ids.empty())
return 0;
char tmp[16];
std::unique_ptr<char[]> tmp2(new (std::nothrow) char[ids.size() * 16]);
char const *paramValues[1];
if (tmp2 == nullptr) return 0; //failed to allocate memory, return */
// create a list of ids in tmp2 to query the database */
sprintf(tmp2.get(), "{");
for(idlist_t::const_iterator it = ids.begin(); it != ids.end(); ++it) {
snprintf(tmp, sizeof(tmp), "%" PRIdOSMID ",", *it);
strncat(tmp2.get(), tmp, sizeof(char)*(ids.size()*16 - 2));
}
tmp2[strlen(tmp2.get()) - 1] = '}'; // replace last , with } to complete list of ids*/
pgsql_endCopy(way_table);
PGconn *sql_conn = way_table->sql_conn;
paramValues[0] = tmp2.get();
PGresult *res = pgsql_execPrepared(sql_conn, "get_way_list", 1, paramValues, PGRES_TUPLES_OK);
int countPG = PQntuples(res);
idlist_t wayidspg;
for (int i = 0; i < countPG; i++) {
wayidspg.push_back(strtoosmid(PQgetvalue(res, i, 0), nullptr, 10));
}
// Match the list of ways coming from postgres in a different order
// back to the list of ways given by the caller */
for(idlist_t::const_iterator it = ids.begin(); it != ids.end(); ++it) {
for (int j = 0; j < countPG; j++) {
if (*it == wayidspg[j]) {
way_ids.push_back(*it);
tags.push_back(taglist_t());
pgsql_parse_tags(PQgetvalue(res, j, 2), tags.back());
size_t num_nodes = strtoul(PQgetvalue(res, j, 3), nullptr, 10);
idlist_t list;
pgsql_parse_nodes( PQgetvalue(res, j, 1), list);
if (num_nodes != list.size()) {
fprintf(stderr, "parse_nodes problem for way %s: expected nodes %zu got %zu\n",
tmp, num_nodes, list.size());
util::exit_nicely();
}
nodes.push_back(nodelist_t());
nodes_get_list(nodes.back(), list);
break;
}
}
}
assert(way_ids.size() <= ids.size());
PQclear(res);
return way_ids.size();
}