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rbock
d062c1a0d8
traits are shorter and easier to identify by using tags in a variadic template recursive traits can be automatically derived, which makes it much easier to add new traits to be handed through the expression tree.
122 lines
4.0 KiB
C++
122 lines
4.0 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_COLUMN_H
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#define SQLPP_COLUMN_H
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#include <sqlpp11/alias.h>
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#include <sqlpp11/column_fwd.h>
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#include <sqlpp11/default_value.h>
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#include <sqlpp11/null.h>
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#include <sqlpp11/sort_order.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/vendor/assignment.h>
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#include <sqlpp11/vendor/expression.h>
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#include <sqlpp11/vendor/serializer.h>
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#include <sqlpp11/vendor/wrong.h>
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#include <sqlpp11/detail/type_set.h>
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namespace sqlpp
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{
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template<typename Table, typename ColumnSpec>
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struct column_t: public ColumnSpec::_value_type::template expression_operators<column_t<Table, ColumnSpec>>,
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public ColumnSpec::_value_type::template column_operators<column_t<Table, ColumnSpec>>
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{
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using _traits = make_traits_t<value_type_of<ColumnSpec>, tag::column, tag::expression, tag::named_expression>;
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struct _recursive_traits
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{
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using _provided_tables = detail::type_set<>;
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using _required_tables = detail::type_set<_table>;
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};
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using _spec_t = ColumnSpec;
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using _table = Table;
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using _column_type = typename _spec_t::_column_type;
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using _name_t = typename _spec_t::_name_t;
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template<typename T>
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using _is_valid_operand = typename value_type_of<ColumnSpec>::template _is_valid_operand<T>;
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column_t() = default;
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column_t(const column_t&) = default;
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column_t(column_t&&) = default;
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column_t& operator=(const column_t&) = default;
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column_t& operator=(column_t&&) = default;
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~column_t() = default;
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static constexpr const char* _get_name()
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{
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return _name_t::_get_name();
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}
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template<typename alias_provider>
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expression_alias_t<column_t, alias_provider> as(const alias_provider&) const
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{
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return { *this };
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}
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template<typename T>
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auto operator =(T t) const -> vendor::assignment_t<column_t, typename vendor::wrap_operand<T>::type>
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{
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using rhs = vendor::wrap_operand_t<T>;
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static_assert(_is_valid_operand<rhs>::value, "invalid rhs operand assignment operand");
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return { *this, {t} };
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}
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auto operator =(sqlpp::null_t) const
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->vendor::assignment_t<column_t, sqlpp::null_t>
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{
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static_assert(can_be_null_t<column_t>::value, "column cannot be null");
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return { *this, {} };
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}
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auto operator =(sqlpp::default_value_t) const
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->vendor::assignment_t<column_t, sqlpp::default_value_t>
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{
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return { *this, {} };
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}
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};
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namespace vendor
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{
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template<typename Context, typename... Args>
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struct serializer_t<Context, column_t<Args...>>
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{
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using T = column_t<Args...>;
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static Context& _(const T& t, Context& context)
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{
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context << T::_table::_name_t::_get_name() << '.' << T::_name_t::_get_name();
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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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