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// file : odb/qt/basic/pgsql/uuid-traits.hxx
// copyright : Copyright (c) 2009-2019 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_QT_BASIC_PGSQL_UUID_TRAITS_HXX
#define ODB_QT_BASIC_PGSQL_UUID_TRAITS_HXX
#include <odb/pre.hxx>
#include <cstring> // std::memcpy
#include <QtCore/QUuid>
#include <odb/pgsql/traits.hxx>
namespace odb
{
namespace pgsql
{
template <>
class default_value_traits<QUuid, id_uuid>
{
public:
typedef QUuid value_type;
typedef value_type query_type;
typedef unsigned char* image_type;
// PostgreSQL binary UUID representation is big-endian in the RFC 4122,
// section 4.1.2 order. While Qt provides (since 4.8) to/fromRfc4122(),
// they both incur a memory allocation (by QByteArray) which we could
// avoid, if we did it ourselves.
//
static void
set_value (value_type& v, const unsigned char* i, bool is_null)
{
if (!is_null)
v = QUuid::fromRfc4122 (
QByteArray (reinterpret_cast<const char*> (i), 16));
else
v = QUuid ();
}
static void
set_image (unsigned char* i, bool& is_null, const value_type& v)
{
// If we can, store nil as NULL. Otherwise, store it as a value.
//
is_null = is_null && v.isNull ();
if (!is_null)
std::memcpy (i, v.toRfc4122 ().constData (), 16);
}
};
template <>
struct default_type_traits<QUuid>
{
static const database_type_id db_type_id = id_uuid;
};
}
}
#include <odb/post.hxx>
#endif // ODB_QT_BASIC_PGSQL_UUID_TRAITS_HXX
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