// file : mysql/types/traits.hxx // copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC // license : GNU GPL v2; see accompanying LICENSE file #ifndef TRAITS_HXX #define TRAITS_HXX #include <limits> // std::numeric_limits #include <sstream> #include <cstring> // std::memcpy #include <odb/mysql/traits.hxx> #include "test.hxx" // point namespace odb { namespace mysql { template <> class value_traits<point, id_string> { public: typedef point value_type; typedef point query_type; typedef char* image_type; static void set_value (point& v, const details::buffer& b, std::size_t n, bool is_null) { if (is_null) v = point (); else { // Point format is "POINT(x y)". // std::istringstream is (std::string (b.data () + 6, n - 6)); is >> v.x; is >> v.y; } } static void set_image (details::buffer& b, std::size_t& n, bool& is_null, const point& v) { is_null = false; std::ostringstream os; // The formula for the number of decimla digits required is given in: // // http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1822.pdf // os.precision (std::numeric_limits<double>::digits10); // os.precision (2 + std::numeric_limits<double>::digits * 301/1000); os << "POINT(" << v.x << ' ' << v.y << ')'; const std::string& s (os.str ()); n = s.size (); if (n > b.capacity ()) b.capacity (n); std::memcpy (b.data (), s.c_str (), n); } }; template <> struct type_traits<point> { static const database_type_id db_type_id = id_string; struct conversion { static const char* to () {return "GeomFromText((?))";} }; }; } } #endif // TRAITS_HXX