mirror of
https://github.com/rbock/sqlpp11.git
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200 lines
6.7 KiB
C++
200 lines
6.7 KiB
C++
/*
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* Copyright (c) 2013-2014, 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_WHERE_H
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#define SQLPP_WHERE_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/parameter_list.h>
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#include <sqlpp11/vendor/expression.h>
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#include <sqlpp11/vendor/interpret_tuple.h>
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#include <sqlpp11/vendor/interpretable_list.h>
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#include <sqlpp11/detail/logic.h>
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namespace sqlpp
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{
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namespace vendor
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{
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// WHERE
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template<typename Database, typename... Expressions>
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struct where_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::where>;
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using _recursive_traits = make_recursive_traits<Expressions...>;
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using _is_dynamic = typename std::conditional<std::is_same<Database, void>::value, std::false_type, std::true_type>::type;
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static_assert(_is_dynamic::value or sizeof...(Expressions), "at least one expression argument required in where()");
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static_assert(sqlpp::detail::none_t<is_assignment_t<Expressions>::value...>::value, "at least one argument is an assignment in where()");
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static_assert(sqlpp::detail::all_t<is_expression_t<Expressions>::value...>::value, "at least one argument is not valid expression in where()");
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where_t(Expressions... expressions):
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_expressions(expressions...)
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{}
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where_t(const where_t&) = default;
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where_t(where_t&&) = default;
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where_t& operator=(const where_t&) = default;
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where_t& operator=(where_t&&) = default;
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~where_t() = default;
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template<typename Policies>
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struct _methods_t
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{
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template<typename Expression>
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void add_where_ntc(Expression expression)
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{
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add_where<Expression, std::false_type>(expression);
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}
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template<typename Expression, typename TableCheckRequired = std::true_type>
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void add_where(Expression expression)
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{
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static_assert(_is_dynamic::value, "add_where can only be called for dynamic_where");
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static_assert(is_expression_t<Expression>::value, "invalid expression argument in add_where()");
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static_assert(TableCheckRequired::value or Policies::template _no_unknown_tables<Expression>::value, "expression uses tables unknown to this statement in add_where()");
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using ok = ::sqlpp::detail::all_t<_is_dynamic::value, is_expression_t<Expression>::value>;
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_add_where_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 Expression>
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void _add_where_impl(Expression expression, const std::true_type&)
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{
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return static_cast<typename Policies::_statement_t*>(this)->_where._dynamic_expressions.emplace_back(expression);
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}
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template<typename Expression>
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void _add_where_impl(Expression expression, const std::false_type&);
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};
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std::tuple<Expressions...> _expressions;
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vendor::interpretable_list_t<Database> _dynamic_expressions;
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};
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template<>
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struct where_t<void, bool>
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::where>;
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using _recursive_traits = make_recursive_traits<>;
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where_t(bool condition):
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_condition(condition)
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{}
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where_t(const where_t&) = default;
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where_t(where_t&&) = default;
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where_t& operator=(const where_t&) = default;
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where_t& operator=(where_t&&) = default;
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~where_t() = default;
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template<typename Policies>
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struct _methods_t
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{
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};
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bool _condition;
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};
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struct no_where_t
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{
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using _traits = make_traits<no_value_t, ::sqlpp::tag::where>;
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using _recursive_traits = make_recursive_traits<>;
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template<typename Policies>
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struct _methods_t
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{
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using _database_t = typename Policies::_database_t;
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template<typename T>
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using _new_statement_t = typename Policies::template _new_statement_t<no_where_t, T>;
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template<typename... Args>
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auto where(Args... args)
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-> _new_statement_t<where_t<void, Args...>>
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{
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return { *static_cast<typename Policies::_statement_t*>(this), where_t<void, Args...>{args...} };
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}
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template<typename... Args>
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auto dynamic_where(Args... args)
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-> _new_statement_t<where_t<_database_t, Args...>>
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{
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static_assert(not std::is_same<_database_t, void>::value, "dynamic_where must not be called in a static statement");
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return { *static_cast<typename Policies::_statement_t*>(this), vendor::where_t<_database_t, Args...>{args...} };
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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... Expressions>
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struct serializer_t<Context, where_t<Database, Expressions...>>
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{
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using T = where_t<Database, Expressions...>;
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static Context& _(const T& t, Context& context)
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{
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if (sizeof...(Expressions) == 0 and t._dynamic_expressions.empty())
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return context;
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context << " WHERE ";
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interpret_tuple(t._expressions, " AND ", context);
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if (sizeof...(Expressions) and 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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template<typename Context>
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struct serializer_t<Context, where_t<void, bool>>
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{
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using T = where_t<void, bool>;
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static Context& _(const T& t, Context& context)
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{
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if (not t._condition)
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context << " WHERE NULL";
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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, no_where_t>
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{
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using T = no_where_t;
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static Context& _(const T& t, Context& context)
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{
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return context;
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}
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};
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}
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}
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#endif
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