mirror of
https://github.com/rbock/sqlpp11.git
synced 2024-11-16 04:47:18 +08:00
299 lines
10 KiB
C++
299 lines
10 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_FROM_H
|
|
#define SQLPP_FROM_H
|
|
|
|
#include <sqlpp11/table_ref.h>
|
|
#include <sqlpp11/type_traits.h>
|
|
#include <sqlpp11/no_data.h>
|
|
#include <sqlpp11/interpretable_list.h>
|
|
#include <sqlpp11/interpret_tuple.h>
|
|
#include <sqlpp11/logic.h>
|
|
#include <sqlpp11/detail/sum.h>
|
|
#include <sqlpp11/policy_update.h>
|
|
#include <sqlpp11/dynamic_join.h>
|
|
|
|
namespace sqlpp
|
|
{
|
|
// FROM DATA
|
|
template <typename Database, typename Table>
|
|
struct from_data_t
|
|
{
|
|
from_data_t(Table table) : _table(table)
|
|
{
|
|
}
|
|
|
|
from_data_t(const from_data_t&) = default;
|
|
from_data_t(from_data_t&&) = default;
|
|
from_data_t& operator=(const from_data_t&) = default;
|
|
from_data_t& operator=(from_data_t&&) = default;
|
|
~from_data_t() = default;
|
|
|
|
Table _table;
|
|
interpretable_list_t<Database> _dynamic_tables;
|
|
};
|
|
|
|
// FROM
|
|
template <typename Database, typename Table>
|
|
struct from_t
|
|
{
|
|
using _traits = make_traits<no_value_t, tag::is_from>;
|
|
using _nodes = detail::type_vector<Table>;
|
|
using _is_dynamic = is_database<Database>;
|
|
|
|
// Data
|
|
using _data_t = from_data_t<Database, Table>;
|
|
|
|
// 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 DynamicJoin>
|
|
void add(DynamicJoin dynamicJoin)
|
|
{
|
|
static_assert(_is_dynamic::value, "from::add() must not be called for static from()");
|
|
static_assert(is_dynamic_join_t<DynamicJoin>::value, "invalid argument in from::add(), expected dynamic_join");
|
|
using _known_tables = provided_tables_of<Table>; // Hint: Joins contain more than one table
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/feedback/details/2173198
|
|
// using _known_table_names = detail::transform_set_t<name_of, _known_tables>;
|
|
using _known_table_names = detail::make_name_of_set_t<_known_tables>;
|
|
using _joined_tables = provided_tables_of<DynamicJoin>;
|
|
using _joined_table_names = detail::make_name_of_set_t<_joined_tables>;
|
|
static_assert(detail::is_disjunct_from<_joined_table_names, _known_table_names>::value,
|
|
"Must not use the same table name twice in from()");
|
|
using _serialize_check = sqlpp::serialize_check_t<typename Database::_serializer_context_t, DynamicJoin>;
|
|
_serialize_check::_();
|
|
|
|
using ok = logic::all_t<_is_dynamic::value, is_table_t<DynamicJoin>::value, _serialize_check::type::value>;
|
|
|
|
_add_impl(dynamicJoin, ok()); // dispatch to prevent compile messages after the static_assert
|
|
}
|
|
|
|
private:
|
|
template <typename DynamicJoin>
|
|
void _add_impl(DynamicJoin dynamicJoin, const std::true_type&)
|
|
{
|
|
return _data._dynamic_tables.emplace_back(from_table(dynamicJoin));
|
|
}
|
|
|
|
template <typename DynamicJoin>
|
|
void _add_impl(DynamicJoin dynamicJoin, const std::false_type&);
|
|
|
|
public:
|
|
_data_t _data;
|
|
};
|
|
|
|
// Base template to be inherited by the statement
|
|
template <typename Policies>
|
|
struct _base_t
|
|
{
|
|
using _data_t = from_data_t<Database, Table>;
|
|
|
|
// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
|
|
template <typename... Args>
|
|
_base_t(Args&&... args)
|
|
: from{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> from;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return from;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return from;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.from)
|
|
{
|
|
return t.from;
|
|
}
|
|
|
|
// FIXME: We might want to check if we have too many tables define in the FROM
|
|
using _consistency_check = consistent_t;
|
|
};
|
|
};
|
|
|
|
SQLPP_PORTABLE_STATIC_ASSERT(
|
|
assert_from_not_pre_join_t,
|
|
"from() argument is a pre join, please use an explicit on() condition or unconditionally()");
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_from_table_t, "from() argument has to be a table or join expression");
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_from_dependency_free_t, "at least one table depends on another table in from()");
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_from_no_duplicates_t, "at least one duplicate table name detected in from()");
|
|
|
|
SQLPP_PORTABLE_STATIC_ASSERT(assert_from_dynamic_statement_dynamic_t,
|
|
"dynamic_from must not be called in a static statement");
|
|
|
|
template <typename Table>
|
|
struct check_from
|
|
{
|
|
using type = static_combined_check_t<
|
|
static_check_t<not is_pre_join_t<Table>::value, assert_from_not_pre_join_t>,
|
|
static_check_t<is_table_t<Table>::value, assert_from_table_t>,
|
|
static_check_t<required_tables_of<Table>::size::value == 0, assert_from_dependency_free_t>,
|
|
static_check_t<provided_tables_of<Table>::size::value ==
|
|
detail::make_name_of_set_t<provided_tables_of<Table>>::size::value,
|
|
assert_from_no_duplicates_t>>;
|
|
};
|
|
|
|
template <typename Table>
|
|
using check_from_t = typename check_from<Table>::type;
|
|
|
|
template <typename Table>
|
|
using check_from_static_t = check_from_t<Table>;
|
|
|
|
template <typename Database, typename Table>
|
|
using check_from_dynamic_t = static_combined_check_t<
|
|
static_check_t<not std::is_same<Database, void>::value, assert_from_dynamic_statement_dynamic_t>,
|
|
check_from_t<Table>>;
|
|
|
|
struct no_from_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_from{std::forward<Args>(args)...}
|
|
{
|
|
}
|
|
|
|
_impl_t<Policies> no_from;
|
|
_impl_t<Policies>& operator()()
|
|
{
|
|
return no_from;
|
|
}
|
|
const _impl_t<Policies>& operator()() const
|
|
{
|
|
return no_from;
|
|
}
|
|
|
|
template <typename T>
|
|
static auto _get_member(T t) -> decltype(t.no_from)
|
|
{
|
|
return t.no_from;
|
|
}
|
|
|
|
using _database_t = typename Policies::_database_t;
|
|
|
|
template <typename Check, typename T>
|
|
using _new_statement_t = new_statement_t<Check::value, Policies, no_from_t, T>;
|
|
|
|
using _consistency_check = consistent_t;
|
|
|
|
template <typename Table>
|
|
auto from(Table table) const -> _new_statement_t<check_from_static_t<Table>, from_t<void, from_table_t<Table>>>
|
|
{
|
|
using Check = check_from_static_t<Table>;
|
|
Check{}._();
|
|
return _from_impl<void>(Check{}, table);
|
|
}
|
|
|
|
template <typename Table>
|
|
auto dynamic_from(Table table) const
|
|
-> _new_statement_t<check_from_dynamic_t<_database_t, Table>, from_t<_database_t, from_table_t<Table>>>
|
|
{
|
|
using Check = check_from_dynamic_t<_database_t, Table>;
|
|
Check{}._();
|
|
return _from_impl<_database_t>(Check{}, table);
|
|
}
|
|
|
|
private:
|
|
template <typename Database, typename Table>
|
|
auto _from_impl(const std::false_type&, Table table) const -> bad_statement;
|
|
|
|
template <typename Database, typename Table>
|
|
auto _from_impl(const std::true_type&, Table table) const
|
|
-> _new_statement_t<std::true_type, from_t<Database, from_table_t<Table>>>
|
|
{
|
|
return {static_cast<const derived_statement_t<Policies>&>(*this),
|
|
from_data_t<Database, from_table_t<Table>>{from_table(table)}};
|
|
}
|
|
};
|
|
};
|
|
|
|
// Interpreters
|
|
template <typename Context, typename Database, typename Table>
|
|
struct serializer_t<Context, from_data_t<Database, Table>>
|
|
{
|
|
using _serialize_check = serialize_check_of<Context, Table>;
|
|
using T = from_data_t<Database, Table>;
|
|
|
|
static Context& _(const T& t, Context& context)
|
|
{
|
|
context << " FROM ";
|
|
serialize(t._table, context);
|
|
if (not t._dynamic_tables.empty())
|
|
{
|
|
context << ' ';
|
|
interpret_list(t._dynamic_tables, ' ', context);
|
|
}
|
|
return context;
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
auto from(T&& t) -> decltype(statement_t<void, no_from_t>().from(std::forward<T>(t)))
|
|
{
|
|
return statement_t<void, no_from_t>().from(std::forward<T>(t));
|
|
}
|
|
}
|
|
|
|
#endif
|