OSM():
osm_name("name:zh"),
radius(0.0008)
{
ptrConn = new pqxx::connection("dbname=nominatim user=osm password=osm hostaddr=127.0.0.1 port=5432");
if (!ptrConn->is_open())
throw std::string("database connection problem.");
mapCountry["country"]="place"; //level 1
mapState["administrative"]="boundary"; //level 2
mapCity["suburb"]="place"; //level 3
mapCity["village"]="place";
mapCity["town"]="place";
mapCity["city"]="place";
mapCity["hamlet"]="place";
mapRoad["highway"]="highway"; //level 4
mapRoad["highway"]="tertiary";
}
