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sqlpp11/include/sqlpp11/sort_order.h
2014-07-28 06:54:54 +02:00

74 lines
2.2 KiB
C++

/*
* Copyright (c) 2013-2014, Roland Bock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQLPP_SORT_ORDER_H
#define SQLPP_SORT_ORDER_H
#include <sqlpp11/detail/type_set.h>
#include <sqlpp11/no_value.h>
namespace sqlpp
{
enum class sort_type
{
asc,
desc
};
template<typename Expression, sort_type SortType>
struct sort_order_t
{
using _traits = make_traits<no_value_t, tag::is_sort_order, sqlpp::tag::is_expression>;
using _recursive_traits = make_recursive_traits<Expression>;
Expression _expression;
};
template<typename Context, typename Expression, sort_type SortType>
struct serializer_t<Context, sort_order_t<Expression, SortType>>
{
using T = sort_order_t<Expression, SortType>;
static Context& _(const T& t, Context& context)
{
serialize(t._expression, context);
switch(SortType)
{
case sort_type::asc:
context << " ASC";
break;
default:
context << " DESC";
break;
}
return context;
}
};
}
#endif