mirror of
https://github.com/rbock/sqlpp11.git
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43ec2343c3
It was serialized with a dummy expression, which turned out to be problematic for some vendors, see #282
443 lines
15 KiB
C++
443 lines
15 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 SQLPP11_WHERE_H
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#define SQLPP11_WHERE_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/logic.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/statement_fwd.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/unconditional.h>
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#include <sqlpp11/value.h>
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namespace sqlpp
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{
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// WHERE DATA
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template <typename Database, typename Expression>
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struct where_data_t
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{
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where_data_t(Expression expression) : _expression(expression)
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{
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}
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where_data_t(const where_data_t&) = default;
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where_data_t(where_data_t&&) = default;
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where_data_t& operator=(const where_data_t&) = default;
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where_data_t& operator=(where_data_t&&) = default;
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~where_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_where_t,
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"at least one expression in where() requires a table which is otherwise not known in the statement");
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// WHERE(EXPR)
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template <typename Database, typename Expression>
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struct where_t
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{
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using _traits = make_traits<no_value_t, tag::is_where>;
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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 = where_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/2173269
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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(Expr expression)
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{
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static_assert(_is_dynamic::value, "where::add() can only be called for dynamic_where");
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static_assert(is_expression_t<Expr>::value, "invalid expression argument in where::add()");
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static_assert(is_boolean_t<Expr>::value, "invalid expression argument in where::add()");
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static_assert(Policies::template _no_unknown_tables<Expr>::value,
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"expression uses tables unknown to this statement in where::add()");
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static_assert(not contains_aggregate_function_t<Expr>::value,
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"where expression must not contain aggregate functions");
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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& /*unused*/)
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{
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_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 = where_data_t<Database, Expression>;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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template <typename... Args>
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_base_t(Args&&... args) : where{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> where;
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_impl_t<Policies>& operator()()
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{
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return where;
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}
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const _impl_t<Policies>& operator()() const
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{
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return where;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.where)
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{
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return t.where;
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}
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using _consistency_check = typename std::conditional<Policies::template _no_unknown_tables<where_t>::value,
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consistent_t,
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assert_no_unknown_tables_in_where_t>::type;
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};
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};
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template <>
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struct where_data_t<void, unconditional_t>
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{
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};
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// WHERE() UNCONDITIONALLY
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template <>
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struct where_t<void, unconditional_t>
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{
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using _traits = make_traits<no_value_t, tag::is_where>;
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using _nodes = detail::type_vector<>;
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// Data
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using _data_t = where_data_t<void, unconditional_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/2173269
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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 = where_data_t<void, unconditional_t>;
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// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2173269
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template <typename... Args>
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_base_t(Args&&... args) : where{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> where;
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_impl_t<Policies>& operator()()
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{
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return where;
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}
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const _impl_t<Policies>& operator()() const
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{
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return where;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.where)
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{
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return t.where;
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}
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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(assert_where_or_unconditionally_called_t,
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"calling where() or unconditionally() required");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_where_arg_is_not_cpp_bool_t,
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"where() argument has to be an sqlpp boolean expression. Please use "
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".unconditionally() instead of .where(true), or sqlpp::value(bool)");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_where_arg_is_boolean_expression_t,
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"where() argument has to be an sqlpp boolean expression.");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_where_arg_contains_no_aggregate_functions_t,
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"at least one aggregate function used in where()");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_where_dynamic_used_with_dynamic_statement_t,
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"dynamic_where() must not be called in a static statement");
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// workaround for msvc bugs https://connect.microsoft.com/VisualStudio/Feedback/Details/2086629 &
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// https://connect.microsoft.com/VisualStudio/feedback/details/2173198
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// template <typename... Expressions>
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// using check_where_t = static_combined_check_t<
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// static_check_t<logic::all_t<is_not_cpp_bool_t<Expressions>::value...>::value,
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// assert_where_arg_is_not_cpp_bool_t>,
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// static_check_t<logic::all_t<is_expression_t<Expressions>::value...>::value,
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// assert_where_boolean_expressions_t>,
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// static_check_t<logic::all_t<is_boolean_t<Expressions>::value...>::value,
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// assert_where_arg_is_boolean_expression_t>,
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// static_check_t<logic::all_t<(not contains_aggregate_function_t<Expressions>::value)...>::value,
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// assert_where_arg_contains_no_aggregate_functions_t>>;
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template <typename Expression>
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struct check_where
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{
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using type = static_combined_check_t<
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static_check_t<is_not_cpp_bool_t<Expression>::value, assert_where_arg_is_not_cpp_bool_t>,
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static_check_t<is_expression_t<Expression>::value, assert_where_arg_is_boolean_expression_t>,
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static_check_t<is_boolean_t<Expression>::value, assert_where_arg_is_boolean_expression_t>,
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static_check_t<not contains_aggregate_function_t<Expression>::value,
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assert_where_arg_contains_no_aggregate_functions_t>>;
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};
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template <typename Expression>
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using check_where_t = typename check_where<Expression>::type;
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template <typename Expression>
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using check_where_static_t = check_where_t<Expression>;
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template <typename Database, typename Expression>
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using check_where_dynamic_t = static_combined_check_t<
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static_check_t<not std::is_same<Database, void>::value, assert_where_dynamic_used_with_dynamic_statement_t>,
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check_where_t<Expression>>;
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template <typename Database>
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using check_where_empty_dynamic_t = static_combined_check_t<
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static_check_t<not std::is_same<Database, void>::value, assert_where_dynamic_used_with_dynamic_statement_t>>;
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// NO WHERE YET
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template <bool WhereRequired>
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struct no_where_t
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{
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using _traits = make_traits<no_value_t, tag::is_where>;
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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/2173269
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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/2173269
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template <typename... Args>
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_base_t(Args&&... args) : no_where{std::forward<Args>(args)...}
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{
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}
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_impl_t<Policies> no_where;
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_impl_t<Policies>& operator()()
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{
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return no_where;
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}
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const _impl_t<Policies>& operator()() const
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{
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return no_where;
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}
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template <typename T>
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static auto _get_member(T t) -> decltype(t.no_where)
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{
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return t.no_where;
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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_where_t, T>;
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using _consistency_check =
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typename std::conditional<WhereRequired and (Policies::_all_provided_tables::size::value > 0),
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assert_where_or_unconditionally_called_t,
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consistent_t>::type;
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auto unconditionally() const -> _new_statement_t<consistent_t, where_t<void, unconditional_t>>
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{
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return {static_cast<const derived_statement_t<Policies>&>(*this), where_data_t<void, unconditional_t>{}};
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}
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template <typename Expression>
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auto where(Expression expression) const
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-> _new_statement_t<check_where_static_t<Expression>, where_t<void, Expression>>
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{
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using Check = check_where_static_t<Expression>;
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return _where_impl<void>(Check{}, expression);
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}
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template <typename Expression>
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auto dynamic_where(Expression expression) const
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-> _new_statement_t<check_where_dynamic_t<_database_t, Expression>, where_t<_database_t, Expression>>
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{
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using Check = check_where_dynamic_t<_database_t, Expression>;
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return _where_impl<_database_t>(Check{}, expression);
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}
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auto dynamic_where() const
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-> _new_statement_t<check_where_empty_dynamic_t<_database_t>, where_t<_database_t, unconditional_t>>
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{
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return {static_cast<const derived_statement_t<Policies>&>(*this),
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where_data_t<_database_t, unconditional_t>{unconditional_t{}}};
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}
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private:
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template <typename Database, typename Check, typename Expression>
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auto _where_impl(Check, Expression expression) const -> inconsistent<Check>;
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template <typename Database, typename Expression>
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auto _where_impl(consistent_t /*unused*/, Expression expression) const
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-> _new_statement_t<consistent_t, where_t<Database, Expression>>
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{
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return {static_cast<const derived_statement_t<Policies>&>(*this),
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where_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, where_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 = where_data_t<Database, Expression>;
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static Context& _(const T& t, Context& context)
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{
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context << " WHERE ";
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serialize(t._expression, context);
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if (not t._dynamic_expressions.empty())
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{
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context << " AND ";
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}
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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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template <typename Context, typename Database>
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struct serializer_t<Context, where_data_t<Database, unconditional_t>>
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{
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using _serialize_check = consistent_t;
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using T = where_data_t<Database, unconditional_t>;
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static Context& _(const T& t, Context& context)
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{
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if (t._dynamic_expressions.empty())
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{
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return context;
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}
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context << " WHERE ";
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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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template <typename Context>
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struct serializer_t<Context, where_data_t<void, unconditional_t>>
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{
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using _serialize_check = consistent_t;
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using T = where_data_t<void, unconditional_t>;
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static Context& _(const T& /*unused*/, Context& 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 where(T&& t) -> decltype(statement_t<void, no_where_t<false>>().where(std::forward<T>(t)))
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{
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return statement_t<void, no_where_t<false>>().where(std::forward<T>(t));
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}
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template <typename Database, typename T>
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auto dynamic_where(const Database& /*unused*/, T&& t)
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-> decltype(statement_t<Database, no_where_t<false>>().dynamic_where(std::forward<T>(t)))
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{
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return statement_t<Database, no_where_t<false>>().dynamic_where(std::forward<T>(t));
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}
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template <typename Database>
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auto dynamic_where(const Database & /*unused*/)
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-> decltype(statement_t<Database, no_where_t<false>>().dynamic_where())
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{
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return statement_t<Database, no_where_t<false>>().dynamic_where();
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}
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inline auto unconditionally() -> decltype(statement_t<void, no_where_t<false>>().unconditionally())
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{
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return statement_t<void, no_where_t<false>>().unconditionally();
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}
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} // namespace sqlpp
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#endif
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