mirror of
https://github.com/rbock/sqlpp11.git
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277 lines
9.1 KiB
C++
277 lines
9.1 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_HAVING_H
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#define SQLPP_HAVING_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/value.h>
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#include <sqlpp11/expression.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/policy_update.h>
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#include <sqlpp11/logic.h>
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namespace sqlpp
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{
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// HAVING DATA
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template <typename Database, typename Expression>
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struct having_data_t
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{
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having_data_t(Expression expression) : _expression(expression)
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{
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}
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having_data_t(const having_data_t&) = default;
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having_data_t(having_data_t&&) = default;
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having_data_t& operator=(const having_data_t&) = default;
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having_data_t& operator=(having_data_t&&) = default;
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~having_data_t() = default;
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Expression _expression;
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interpretable_list_t<Database> _dynamic_expressions;
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};
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SQLPP_PORTABLE_STATIC_ASSERT(
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assert_no_unknown_tables_in_having_t,
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"at least one having-expression requires a table which is otherwise not known in the statement");
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// HAVING
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template <typename Database, typename Expression>
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struct having_t
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{
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using _traits = make_traits<no_value_t, tag::is_having>;
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using _nodes = detail::type_vector<Expression>;
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using _is_dynamic = is_database<Database>;
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// Data
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using _data_t = having_data_t<Database, Expression>;
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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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template <typename Expr>
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void add_ntc(Expr expression)
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{
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add<Expr, std::false_type>(expression);
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}
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template <typename Expr, typename TableCheckRequired = std::true_type>
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void add(Expr expression)
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{
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static_assert(_is_dynamic::value, "having::add() can only be called for dynamic_having");
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static_assert(is_expression_t<Expr>::value, "invalid expression argument in having::add()");
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static_assert(not TableCheckRequired::value or Policies::template _no_unknown_tables<Expr>::value,
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"expression uses tables unknown to this statement in having::add()");
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using _serialize_check = sqlpp::serialize_check_t<typename Database::_serializer_context_t, Expr>;
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_serialize_check::_();
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using ok = logic::all_t<_is_dynamic::value, is_expression_t<Expr>::value, _serialize_check::type::value>;
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_add_impl(expression, ok()); // dispatch to prevent compile messages after the static_assert
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}
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private:
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template <typename Expr>
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void _add_impl(Expr expression, const std::true_type&)
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{
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return _data._dynamic_expressions.emplace_back(expression);
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}
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template <typename Expr>
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void _add_impl(Expr expression, const std::false_type&);
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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 = having_data_t<Database, Expression>;
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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)
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: having{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> having;
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_impl_t<Policies>& operator()()
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{
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return having;
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}
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const _impl_t<Policies>& operator()() const
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{
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return having;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.having)
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{
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return t.having;
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}
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using _consistency_check = typename std::conditional<Policies::template _no_unknown_tables<having_t>::value,
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consistent_t,
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assert_no_unknown_tables_in_having_t>::type;
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};
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};
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// NO HAVING YET
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struct no_having_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)
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: no_having{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> no_having;
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_impl_t<Policies>& operator()()
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{
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return no_having;
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}
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const _impl_t<Policies>& operator()() const
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{
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return no_having;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.no_having)
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{
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return t.no_having;
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}
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using _database_t = typename Policies::_database_t;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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// template <typename... T>
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// using _check = logic::all_t<is_expression_t<T>::value...>;
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template <typename... T>
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struct _check : logic::all_t<is_expression_t<T>::value...>
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{
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};
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template <typename Check, typename T>
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using _new_statement_t = new_statement_t<Check::value, Policies, no_having_t, T>;
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using _consistency_check = consistent_t;
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template <typename Expression>
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auto having(Expression expression) const -> _new_statement_t<_check<Expression>, having_t<void, Expression>>
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{
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static_assert(_check<Expression>::value, "at least one argument is not an expression in having()");
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return _having_impl<void>(_check<Expression>{}, expression);
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}
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template <typename Expression>
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auto dynamic_having(Expression expression) const
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-> _new_statement_t<_check<Expression>, having_t<_database_t, Expression>>
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{
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static_assert(_check<Expression>::value, "at least one argument is not an expression in having()");
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static_assert(not std::is_same<_database_t, void>::value,
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"dynamic_having must not be called in a static statement");
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return _having_impl<_database_t>(_check<Expression>{}, expression);
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}
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auto dynamic_having() const -> _new_statement_t<_check<boolean_operand>, having_t<_database_t, boolean_operand>>
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{
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return dynamic_having(::sqlpp::value(true));
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}
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private:
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template <typename Database, typename Expression>
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auto _having_impl(const std::false_type&, Expression expression) const -> bad_statement;
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template <typename Database, typename Expression>
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auto _having_impl(const std::true_type&, Expression expression) const
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-> _new_statement_t<std::true_type, having_t<Database, Expression>>
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{
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return {static_cast<const derived_statement_t<Policies>&>(*this),
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having_data_t<Database, Expression>{expression}};
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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 Expression>
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struct serializer_t<Context, having_data_t<Database, Expression>>
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{
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using _serialize_check = serialize_check_of<Context, Expression>;
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using T = having_data_t<Database, Expression>;
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static Context& _(const T& t, Context& context)
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{
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context << " HAVING ";
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serialize(t._expression, context);
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if (not t._dynamic_expressions.empty())
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context << " AND ";
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interpret_list(t._dynamic_expressions, " AND ", context);
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return context;
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}
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};
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}
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#endif
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