mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 04:47:18 +08:00
85 lines
2.7 KiB
C++
85 lines
2.7 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_IS_NULL_H
|
|
#define SQLPP_IS_NULL_H
|
|
|
|
#include <sqlpp11/boolean.h>
|
|
#include <sqlpp11/type_traits.h>
|
|
#include <sqlpp11/detail/type_set.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
template<bool NotInverted, typename Operand>
|
|
struct is_null_t:
|
|
public expression_operators<is_null_t<NotInverted, Operand>, boolean>,
|
|
public alias_operators<is_null_t<NotInverted, Operand>>
|
|
{
|
|
using _traits = make_traits<boolean, tag::is_expression, tag::is_selectable>;
|
|
using _recursive_traits = make_recursive_traits<Operand>;
|
|
|
|
static constexpr bool _inverted = not NotInverted;
|
|
|
|
struct _name_t
|
|
{
|
|
static constexpr const char* _get_name() { return _inverted ? "IS NOT NULL" : "IS NULL"; }
|
|
template<typename T>
|
|
struct _member_t
|
|
{
|
|
T in;
|
|
};
|
|
};
|
|
|
|
is_null_t(Operand operand):
|
|
_operand(operand)
|
|
{}
|
|
|
|
is_null_t(const is_null_t&) = default;
|
|
is_null_t(is_null_t&&) = default;
|
|
is_null_t& operator=(const is_null_t&) = default;
|
|
is_null_t& operator=(is_null_t&&) = default;
|
|
~is_null_t() = default;
|
|
|
|
Operand _operand;
|
|
};
|
|
|
|
template<typename Context, bool NotInverted, typename Operand>
|
|
struct serializer_t<Context, is_null_t<NotInverted, Operand>>
|
|
{
|
|
using T = is_null_t<NotInverted, Operand>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
serialize(t._operand, context);
|
|
context << (t._inverted ? " IS NOT NULL" : " IS NULL");
|
|
return context;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|