mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 04:47:18 +08:00
334 lines
9.5 KiB
C++
334 lines
9.5 KiB
C++
/*
|
|
* Copyright (c) 2013-2016, 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 SQLPP11_LIMIT_H
|
|
#define SQLPP11_LIMIT_H
|
|
|
|
#include <sqlpp11/detail/type_set.h>
|
|
#include <sqlpp11/policy_update.h>
|
|
#include <sqlpp11/type_traits.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
// LIMIT DATA
|
|
template <typename Limit>
|
|
struct limit_data_t
|
|
{
|
|
limit_data_t(Limit value) : _value(value)
|
|
{
|
|
}
|
|
|
|
limit_data_t(const limit_data_t&) = default;
|
|
limit_data_t(limit_data_t&&) = default;
|
|
limit_data_t& operator=(const limit_data_t&) = default;
|
|
limit_data_t& operator=(limit_data_t&&) = default;
|
|
~limit_data_t() = default;
|
|
|
|
Limit _value;
|
|
};
|
|
|
|
// LIMIT
|
|
template <typename Limit>
|
|
struct limit_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_limit>;
|
|
using _nodes = detail::type_vector<Limit>;
|
|
|
|
// Data
|
|
using _data_t = limit_data_t<Limit>;
|
|
|
|
// Member implementation with data and methods
|
|
template <typename Policies>
|
|
struct _impl_t
|
|
{
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
_impl_t() = default;
|
|
_impl_t(const _data_t& data) : _data(data)
|
|
{
|
|
}
|
|
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = limit_data_t<Limit>;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args) : limit{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> limit;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return limit;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return limit;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.limit)
|
|
{
|
|
return t.limit;
|
|
}
|
|
|
|
using _consistency_check = consistent_t;
|
|
};
|
|
};
|
|
|
|
// DYNAMIC LIMIT DATA
|
|
template <typename Database>
|
|
struct dynamic_limit_data_t
|
|
{
|
|
dynamic_limit_data_t() : _value(noop())
|
|
{
|
|
}
|
|
|
|
template <typename Limit>
|
|
dynamic_limit_data_t(Limit value) : _initialized(true), _value(wrap_operand_t<Limit>(value))
|
|
{
|
|
}
|
|
|
|
dynamic_limit_data_t(const dynamic_limit_data_t&) = default;
|
|
dynamic_limit_data_t(dynamic_limit_data_t&&) = default;
|
|
dynamic_limit_data_t& operator=(const dynamic_limit_data_t&) = default;
|
|
dynamic_limit_data_t& operator=(dynamic_limit_data_t&&) = default;
|
|
~dynamic_limit_data_t() = default;
|
|
|
|
bool _initialized = false;
|
|
interpretable_t<Database> _value;
|
|
};
|
|
|
|
// DYNAMIC LIMIT
|
|
template <typename Database>
|
|
struct dynamic_limit_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_limit>;
|
|
using _nodes = detail::type_vector<>;
|
|
|
|
// Data
|
|
using _data_t = dynamic_limit_data_t<Database>;
|
|
|
|
// Member implementation with data and methods
|
|
template <typename Policies>
|
|
struct _impl_t
|
|
{
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
_impl_t() = default;
|
|
_impl_t(const _data_t& data) : _data(data)
|
|
{
|
|
}
|
|
|
|
template <typename Limit>
|
|
void set(Limit value)
|
|
{
|
|
// FIXME: Make sure that Limit does not require external tables? Need to read up on SQL
|
|
using arg_t = wrap_operand_t<Limit>;
|
|
static_assert(is_unsigned_integral_t<arg_t>::value,
|
|
"limit requires an unsigned integral value or unsigned integral parameter");
|
|
_data._value = arg_t{value};
|
|
_data._initialized = true;
|
|
}
|
|
|
|
public:
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = dynamic_limit_data_t<Database>;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args) : limit{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> limit;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return limit;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return limit;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.limit)
|
|
{
|
|
return t.limit;
|
|
}
|
|
|
|
using _consistency_check = consistent_t;
|
|
};
|
|
};
|
|
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_limit_is_unsigned_integral,
|
|
"argument for limit() must be an unsigned integral expressions");
|
|
template <typename T>
|
|
struct check_limit
|
|
{
|
|
using type =
|
|
static_combined_check_t<static_check_t<is_unsigned_integral_t<T>::value, assert_limit_is_unsigned_integral>>;
|
|
};
|
|
template <typename T>
|
|
using check_limit_t = typename check_limit<wrap_operand_t<T>>::type;
|
|
|
|
struct no_limit_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_noop>;
|
|
using _nodes = detail::type_vector<>;
|
|
|
|
// Data
|
|
using _data_t = no_data_t;
|
|
|
|
// Member implementation with data and methods
|
|
template <typename Policies>
|
|
struct _impl_t
|
|
{
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
_impl_t() = default;
|
|
_impl_t(const _data_t& data) : _data(data)
|
|
{
|
|
}
|
|
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = no_data_t;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args) : no_limit{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> no_limit;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return no_limit;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return no_limit;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.no_limit)
|
|
{
|
|
return t.no_limit;
|
|
}
|
|
|
|
using _database_t = typename Policies::_database_t;
|
|
|
|
template <typename Check, typename T>
|
|
using _new_statement_t = new_statement_t<Check, Policies, no_limit_t, T>;
|
|
|
|
using _consistency_check = consistent_t;
|
|
|
|
template <typename Arg>
|
|
auto limit(Arg arg) const -> _new_statement_t<check_limit_t<Arg>, limit_t<wrap_operand_t<Arg>>>
|
|
{
|
|
return _limit_impl(check_limit_t<Arg>{}, wrap_operand_t<Arg>{arg});
|
|
}
|
|
|
|
auto dynamic_limit() const -> _new_statement_t<consistent_t, dynamic_limit_t<_database_t>>
|
|
{
|
|
return {static_cast<const derived_statement_t<Policies>&>(*this), dynamic_limit_data_t<_database_t>{}};
|
|
}
|
|
|
|
private:
|
|
template <typename Check, typename Arg>
|
|
auto _limit_impl(Check, Arg arg) const -> inconsistent<Check>;
|
|
|
|
template <typename Arg>
|
|
auto _limit_impl(consistent_t /*unused*/, Arg arg) const -> _new_statement_t<consistent_t, limit_t<Arg>>
|
|
{
|
|
return {static_cast<const derived_statement_t<Policies>&>(*this), limit_data_t<Arg>{arg}};
|
|
}
|
|
};
|
|
};
|
|
|
|
// Interpreters
|
|
template <typename Context, typename Database>
|
|
struct serializer_t<Context, dynamic_limit_data_t<Database>>
|
|
{
|
|
using _serialize_check = consistent_t;
|
|
using T = dynamic_limit_data_t<Database>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
if (t._initialized)
|
|
{
|
|
context << " LIMIT ";
|
|
serialize(t._value, context);
|
|
}
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename Context, typename Limit>
|
|
struct serializer_t<Context, limit_data_t<Limit>>
|
|
{
|
|
using _serialize_check = serialize_check_of<Context, Limit>;
|
|
using T = limit_data_t<Limit>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
context << " LIMIT ";
|
|
serialize_operand(t._value, context);
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
auto limit(T&& t) -> decltype(statement_t<void, no_limit_t>().limit(std::forward<T>(t)))
|
|
{
|
|
return statement_t<void, no_limit_t>().limit(std::forward<T>(t));
|
|
}
|
|
|
|
template <typename Database>
|
|
auto dynamic_limit(const Database & /*unused*/) -> decltype(statement_t<Database, no_limit_t>().dynamic_limit())
|
|
{
|
|
return statement_t<Database, no_limit_t>().dynamic_limit();
|
|
}
|
|
} // namespace sqlpp
|
|
|
|
#endif
|