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Diffstat (limited to 'odb-tests/mssql/custom/traits.hxx')
-rw-r--r-- | odb-tests/mssql/custom/traits.hxx | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/odb-tests/mssql/custom/traits.hxx b/odb-tests/mssql/custom/traits.hxx new file mode 100644 index 0000000..2bd99cb --- /dev/null +++ b/odb-tests/mssql/custom/traits.hxx @@ -0,0 +1,148 @@ +// file : mssql/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 <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 |