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// file : odb/qt/date-time/pgsql/qdatetime-traits.hxx
// author : Constantin Michael <constantin@codesynthesis.com>
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_QT_DATE_TIME_PGSQL_QDATETIME_TRAITS_HXX
#define ODB_QT_DATE_TIME_PGSQL_QDATETIME_TRAITS_HXX
#include <odb/pre.hxx>
#include <QtCore/QDateTime>
#include <odb/details/buffer.hxx>
#include <odb/pgsql/traits.hxx>
#include <odb/qt/date-time/exceptions.hxx>
namespace odb
{
namespace pgsql
{
// Implementation of mapping between QDateTime and PostgreSQL TIMESTAMP.
// TIMESTAMP values are stored as micro-seconds since the PostgreSQL
// epoch 2000-01-01.
//
template <>
struct default_value_traits<QDateTime, id_timestamp>
{
typedef details::endian_traits endian_traits;
typedef QDateTime value_type;
typedef QDateTime query_type;
typedef long long image_type;
// The difference between the Unix epoch and the PostgreSQL epoch
// in seconds.
//
static const long long epoch_diff = 946684800LL;
static void
set_value (QDateTime& v, long long i, bool is_null)
{
if (is_null)
// Default constructor creates a null QDateTime.
//
v = QDateTime ();
else
v.setTime_t (
static_cast <uint> (
endian_traits::ntoh (i) / 1000000 + epoch_diff));
}
static void
set_image (long long& i, bool& is_null, const QDateTime& v)
{
if (v.isNull ())
is_null = true;
// QDateTime::toTime_t returns an unsigned integer. Values less
// than the Unix epoch are not supported.
//
else if (v < QDateTime (QDate (1970, 1, 1),
QTime (0, 0, 0),
Qt::UTC))
throw odb::qt::date_time::value_out_of_range ();
else
{
is_null = false;
long long pg_seconds (static_cast<long long> (v.toTime_t ()) -
epoch_diff);
i = endian_traits::hton (pg_seconds * 1000000);
}
}
};
template <>
struct default_type_traits<QDateTime>
{
static const database_type_id db_type_id = id_timestamp;
};
}
}
#endif // ODB_QT_DATE_TIME_PGSQL_QDATETIME_TRAITS_HXX
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