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// file : mysql/types/traits.hxx
// 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 "ST_GeomFromText((?))";}
};
};
}
}
#endif // TRAITS_HXX
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