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// file : odb/mysql/traits.hxx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2005-2010 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_MYSQL_TRAITS_HXX
#define ODB_MYSQL_TRAITS_HXX
#include <odb/pre.hxx>
#include <string>
#include <cstddef> // std::size_t
#include <odb/traits.hxx>
#include <odb/mysql/version.hxx>
#include <odb/mysql/mysql-types.hxx>
#include <odb/details/buffer.hxx>
#include <odb/mysql/details/export.hxx>
namespace odb
{
namespace mysql
{
enum image_id_type
{
id_tiny,
id_utiny,
id_short,
id_ushort,
id_long,
id_ulong,
id_longlong,
id_ulonglong,
id_float,
id_double,
id_date,
id_time,
id_datetime,
id_timestamp,
id_year,
id_string,
id_blob
};
template <typename T, typename I>
class value_traits
{
public:
typedef T value_type;
typedef T query_type;
typedef I image_type;
static void
set_value (T& v, I i, bool is_null)
{
if (!is_null)
v = T (i);
else
v = T ();
}
static void
set_image (I& i, bool& is_null, T v)
{
is_null = false;
i = I (v);
}
};
// std::string specialization.
//
template <>
class LIBODB_MYSQL_EXPORT value_traits<std::string, details::buffer>
{
public:
typedef std::string value_type;
typedef std::string query_type;
typedef details::buffer image_type;
static void
set_value (std::string& v,
const details::buffer& b,
std::size_t n,
bool is_null)
{
if (!is_null)
v.assign (b.data (), n);
else
v.erase ();
}
static void
set_image (details::buffer&,
std::size_t& n,
bool& is_null,
const std::string&);
};
// const char* specialization
//
// Specialization for const char* which only supports initialization
// of an image from the value but not the other way around. This way
// we can pass such values to the queries.
//
template <>
class LIBODB_MYSQL_EXPORT value_traits<const char*, details::buffer>
{
public:
typedef const char* value_type;
typedef const char* query_type;
typedef details::buffer image_type;
static void
set_image (details::buffer&,
std::size_t& n,
bool& is_null,
const char*);
};
//
// image_traits
//
template <typename T>
struct default_image_id;
template <typename T>
class image_traits
{
public:
static const image_id_type image_id = default_image_id<T>::image_id;
};
// Integral types.
//
template <>
struct default_image_id<bool>
{
static const image_id_type image_id = id_tiny;
};
template <>
struct default_image_id<signed char>
{
static const image_id_type image_id = id_tiny;
};
template <>
struct default_image_id<unsigned char>
{
static const image_id_type image_id = id_utiny;
};
template <>
struct default_image_id<short>
{
static const image_id_type image_id = id_short;
};
template <>
struct default_image_id<unsigned short>
{
static const image_id_type image_id = id_ushort;
};
template <>
struct default_image_id<int>
{
static const image_id_type image_id = id_long;
};
template <>
struct default_image_id<unsigned int>
{
static const image_id_type image_id = id_ulong;
};
template <>
struct default_image_id<long>
{
static const image_id_type image_id = id_longlong;
};
template <>
struct default_image_id<unsigned long>
{
static const image_id_type image_id = id_ulonglong;
};
template <>
struct default_image_id<long long>
{
static const image_id_type image_id = id_longlong;
};
template <>
struct default_image_id<unsigned long long>
{
static const image_id_type image_id = id_ulonglong;
};
// Float types.
//
template <>
struct default_image_id<float>
{
static const image_id_type image_id = id_float;
};
template <>
struct default_image_id<double>
{
static const image_id_type image_id = id_double;
};
// String type.
//
template <>
struct default_image_id<std::string>
{
static const image_id_type image_id = id_string;
};
template <>
struct default_image_id<const char*>
{
static const image_id_type image_id = id_string;
};
}
}
#include <odb/post.hxx>
#endif // ODB_MYSQL_TRAITS_HXX
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