mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 04:47:18 +08:00
b41f1add8c
This allows to select NULL via a case statement (seems to make more sense than disallowing it).
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
|
|
* Copyright (c) 2013-2015, 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_NOOP_H
|
|
#define SQLPP_NOOP_H
|
|
|
|
#include <type_traits>
|
|
#include <sqlpp11/data_types/no_value.h>
|
|
#include <sqlpp11/serializer.h>
|
|
#include <sqlpp11/prepared_execute.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
struct noop
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_noop>;
|
|
using _nodes = detail::type_vector<>;
|
|
|
|
struct _alias_t
|
|
{
|
|
};
|
|
|
|
template <typename Statement>
|
|
struct _result_methods_t
|
|
{
|
|
using _statement_t = Statement;
|
|
|
|
const _statement_t& _get_statement() const
|
|
{
|
|
return static_cast<const _statement_t&>(*this);
|
|
}
|
|
|
|
// Execute
|
|
template <typename Db, typename Composite>
|
|
auto _run(Db& db, const Composite& composite) const -> size_t
|
|
{
|
|
return db.execute(composite);
|
|
}
|
|
|
|
template <typename Db>
|
|
auto _run(Db& db) const -> size_t
|
|
{
|
|
return db.execute(_get_statement());
|
|
}
|
|
|
|
// Prepare
|
|
template <typename Db, typename Composite>
|
|
auto _prepare(Db& db, const Composite& composite) const -> prepared_execute_t<Db, Composite>
|
|
{
|
|
return {{}, db.prepare_execute(composite)};
|
|
}
|
|
|
|
template <typename Db>
|
|
auto _prepare(Db& db) const -> prepared_execute_t<Db, _statement_t>
|
|
{
|
|
return {{}, db.prepare_execute(_get_statement())};
|
|
}
|
|
};
|
|
};
|
|
|
|
template <typename Context>
|
|
struct serializer_t<Context, noop>
|
|
{
|
|
using _serialize_check = consistent_t;
|
|
using T = noop;
|
|
|
|
static Context& _(const T&, Context& context)
|
|
{
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct is_noop : std::is_same<T, noop>
|
|
{
|
|
};
|
|
}
|
|
#endif
|