mirror of
https://github.com/rbock/sqlpp11.git
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325 lines
12 KiB
C++
325 lines
12 KiB
C++
/*
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* Copyright (c) 2013-2016, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_FROM_H
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#define SQLPP_FROM_H
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#include <sqlpp11/detail/sum.h>
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#include <sqlpp11/dynamic_join.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/interpretable_list.h>
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#include <sqlpp11/logic.h>
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#include <sqlpp11/no_data.h>
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#include <sqlpp11/policy_update.h>
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#include <sqlpp11/table_ref.h>
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#include <sqlpp11/type_traits.h>
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namespace sqlpp
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{
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// FROM DATA
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template <typename Database, typename Table>
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struct from_data_t
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{
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from_data_t(Table table) : _table(table)
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{
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}
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from_data_t(const from_data_t&) = default;
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from_data_t(from_data_t&&) = default;
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from_data_t& operator=(const from_data_t&) = default;
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from_data_t& operator=(from_data_t&&) = default;
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~from_data_t() = default;
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Table _table;
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interpretable_list_t<Database> _dynamic_tables;
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};
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_add_dynamic, "from::add() requires a dynamic_from");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_add_not_dynamic_pre_join, "join condition missing");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_add_dynamic_join, "from::add(X) requires X to be a dynamic join");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_add_unique_names,
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"from::add() must not add table names already used in from");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_add_no_required_tables,
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"from::add():dynamic join condition depends on "
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"tables not statically known, use "
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"without_table_check() to express the intent");
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template <typename From, typename DynamicJoin>
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struct check_from_add
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{
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using _known_tables = provided_tables_of<typename From::_table_t>; // Hint: Joins contain more than one table
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/feedback/details/2173198
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// using _known_table_names = detail::transform_set_t<name_of, _known_tables>;
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using _known_table_names = detail::make_name_of_set_t<_known_tables>;
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using _joined_tables = provided_tables_of<DynamicJoin>;
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using _joined_table_names = detail::make_name_of_set_t<_joined_tables>;
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using _required_tables = required_tables_of<DynamicJoin>;
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using type = static_combined_check_t<
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static_check_t<From::_is_dynamic::value, assert_from_add_dynamic>,
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static_check_t<not is_dynamic_pre_join_t<DynamicJoin>::value, assert_from_add_not_dynamic_pre_join>,
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static_check_t<is_dynamic_join_t<DynamicJoin>::value, assert_from_add_dynamic_join>,
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static_check_t<detail::is_disjunct_from<_joined_table_names, _known_table_names>::value,
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assert_from_add_unique_names>,
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static_check_t<detail::is_subset_of<_required_tables, _known_tables>::value,
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assert_from_add_no_required_tables>,
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sqlpp::serialize_check_t<serializer_context_of<typename From::_database_t>, DynamicJoin>>;
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};
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template <typename From, typename DynamicJoin>
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using check_from_add_t = typename check_from_add<From, DynamicJoin>::type;
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// FROM
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template <typename Database, typename Table>
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struct from_t
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{
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using _traits = make_traits<no_value_t, tag::is_from>;
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using _nodes = detail::type_vector<Table>;
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// Data
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using _data_t = from_data_t<Database, Table>;
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// Member implementation with data and methods
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template <typename Policies>
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struct _impl_t
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{
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using _database_t = Database;
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using _is_dynamic = is_database<_database_t>;
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using _table_t = Table;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
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_impl_t() = default;
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_impl_t(const _data_t& data) : _data(data)
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{
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}
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template <typename DynamicJoin>
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auto add(DynamicJoin dynamicJoin) -> typename std::
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conditional<check_from_add_t<_impl_t, DynamicJoin>::value, void, check_from_add_t<_impl_t, DynamicJoin>>::type
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{
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using Check = check_from_add_t<_impl_t, DynamicJoin>;
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return _add_impl(dynamicJoin, Check{});
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}
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private:
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template <typename DynamicJoin>
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auto _add_impl(DynamicJoin dynamicJoin, consistent_t) -> void
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{
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_data._dynamic_tables.emplace_back(from_table(dynamicJoin));
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}
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template <typename Check, typename DynamicJoin>
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auto _add_impl(DynamicJoin dynamicJoin, Check) -> inconsistent<Check>;
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public:
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_data_t _data;
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};
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// Base template to be inherited by the statement
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template <typename Policies>
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struct _base_t
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{
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using _data_t = from_data_t<Database, Table>;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
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template <typename... Args>
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_base_t(Args&&... args) : from{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> from;
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_impl_t<Policies>& operator()()
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{
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return from;
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}
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const _impl_t<Policies>& operator()() const
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{
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return from;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.from)
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{
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return t.from;
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}
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// FIXME: We might want to check if we have too many tables define in the FROM
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using _consistency_check = consistent_t;
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};
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};
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SQLPP_PORTABLE_STATIC_ASSERT(
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assert_from_not_pre_join_t,
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"from() argument is a pre join, please use an explicit on() condition or unconditionally()");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_table_t, "from() argument has to be a table or join expression");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_dependency_free_t, "at least one table depends on another table in from()");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_no_duplicates_t, "at least one duplicate table name detected in from()");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_from_dynamic_statement_dynamic_t,
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"dynamic_from must not be called in a static statement");
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template <typename Table>
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struct check_from
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{
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using type = static_combined_check_t<
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static_check_t<not is_pre_join_t<Table>::value, assert_from_not_pre_join_t>,
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static_check_t<is_table_t<Table>::value, assert_from_table_t>,
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static_check_t<required_tables_of<Table>::size::value == 0, assert_from_dependency_free_t>,
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static_check_t<provided_tables_of<Table>::size::value ==
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detail::make_name_of_set_t<provided_tables_of<Table>>::size::value,
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assert_from_no_duplicates_t>>;
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};
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template <typename Table>
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using check_from_t = typename check_from<Table>::type;
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template <typename Table>
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using check_from_static_t = check_from_t<Table>;
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template <typename Database, typename Table>
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using check_from_dynamic_t = static_combined_check_t<
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static_check_t<not std::is_same<Database, void>::value, assert_from_dynamic_statement_dynamic_t>,
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check_from_t<Table>>;
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struct no_from_t
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{
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using _traits = make_traits<no_value_t, tag::is_noop>;
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using _nodes = detail::type_vector<>;
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// Data
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using _data_t = no_data_t;
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// Member implementation with data and methods
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template <typename Policies>
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struct _impl_t
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{
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
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_impl_t() = default;
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_impl_t(const _data_t& data) : _data(data)
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{
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}
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_data_t _data;
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};
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// Base template to be inherited by the statement
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template <typename Policies>
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struct _base_t
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{
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using _data_t = no_data_t;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069
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template <typename... Args>
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_base_t(Args&&... args) : no_from{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> no_from;
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_impl_t<Policies>& operator()()
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{
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return no_from;
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}
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const _impl_t<Policies>& operator()() const
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{
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return no_from;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.no_from)
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{
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return t.no_from;
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}
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using _database_t = typename Policies::_database_t;
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template <typename Check, typename T>
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using _new_statement_t = new_statement_t<Check, Policies, no_from_t, T>;
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using _consistency_check = consistent_t;
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template <typename Table>
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auto from(Table table) const -> _new_statement_t<check_from_static_t<Table>, from_t<void, from_table_t<Table>>>
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{
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using Check = check_from_static_t<Table>;
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return _from_impl<void>(Check{}, table);
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}
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template <typename Table>
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auto dynamic_from(Table table) const
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-> _new_statement_t<check_from_dynamic_t<_database_t, Table>, from_t<_database_t, from_table_t<Table>>>
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{
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using Check = check_from_dynamic_t<_database_t, Table>;
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return _from_impl<_database_t>(Check{}, table);
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}
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private:
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template <typename Database, typename Check, typename Table>
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auto _from_impl(Check, Table table) const -> inconsistent<Check>;
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template <typename Database, typename Table>
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auto _from_impl(consistent_t, Table table) const
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-> _new_statement_t<consistent_t, from_t<Database, from_table_t<Table>>>
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{
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return {static_cast<const derived_statement_t<Policies>&>(*this),
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from_data_t<Database, from_table_t<Table>>{from_table(table)}};
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}
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};
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};
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// Interpreters
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template <typename Context, typename Database, typename Table>
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struct serializer_t<Context, from_data_t<Database, Table>>
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{
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using _serialize_check = serialize_check_of<Context, Table>;
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using T = from_data_t<Database, Table>;
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static Context& _(const T& t, Context& context)
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{
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context << " FROM ";
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serialize(t._table, context);
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if (not t._dynamic_tables.empty())
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{
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interpret_list(t._dynamic_tables, "", context);
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}
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return context;
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}
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};
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template <typename T>
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auto from(T&& t) -> decltype(statement_t<void, no_from_t>().from(std::forward<T>(t)))
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{
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return statement_t<void, no_from_t>().from(std::forward<T>(t));
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}
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template <typename Database, typename T>
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auto dynamic_from(const Database&, T&& t)
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-> decltype(statement_t<Database, no_from_t>().dynamic_from(std::forward<T>(t)))
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{
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return statement_t<Database, no_from_t>().dynamic_from(std::forward<T>(t));
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}
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}
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#endif
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