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// file : mssql/types/traits.hxx
// copyright : Copyright (c) 2009-2015 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 <cassert>
#include <odb/mssql/traits.hxx>
#include "test.hxx" // variant, point
namespace odb
{
namespace mssql
{
template <>
class value_traits<variant, id_long_string>
{
public:
typedef variant value_type;
typedef variant query_type;
typedef long_callback image_type;
static void
set_value (variant& v,
result_callback_type& cb,
void*& context)
{
cb = &result_callback;
context = &v;
}
static void
set_image (param_callback_type& cb,
const void*& context,
bool& is_null,
const variant& v)
{
is_null = false;
cb = ¶m_callback;
context = &v;
}
static void
param_callback (const void* context,
std::size_t* position,
const void** buffer,
std::size_t* size,
chunk_type* chunk,
void* tmp_buffer,
std::size_t tmp_capacity);
static void
result_callback (void* context,
std::size_t* position,
void** buffer,
std::size_t* size,
chunk_type chunk,
std::size_t size_left,
void* tmp_buffer,
std::size_t tmp_capacity);
};
template <>
struct type_traits<variant>
{
static const database_type_id db_type_id = id_long_string;
struct conversion
{
static const char* to () {return "dbo.string_to_variant((?))";}
};
};
#if !defined(MSSQL_SERVER_VERSION) || MSSQL_SERVER_VERSION >= 1000
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 char* 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 + 7, n - 7));
is >> v.x;
is >> v.y;
}
}
static void
set_image (char* b,
std::size_t c,
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 ();
assert (n <= c);
std::memcpy (b, 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 "GEOMETRY::STGeomFromText((?), 0)";}
};
};
#endif // SQL Server > 2005
}
}
#endif // TRAITS_HXX
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