mirror of
https://github.com/rbock/sqlpp11.git
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287 lines
7.5 KiB
C++
287 lines
7.5 KiB
C++
/*
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* Copyright (c) 2013-2015, 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_RESULT_ROW_H
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#define SQLPP_RESULT_ROW_H
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#include <map>
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#include <sqlpp11/result_row_fwd.h>
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#include <sqlpp11/field_spec.h>
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#include <sqlpp11/text.h>
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#include <sqlpp11/detail/field_index_sequence.h>
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namespace sqlpp
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{
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namespace detail
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{
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template<typename Db, typename IndexSequence, typename... FieldSpecs>
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struct result_row_impl;
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template<typename Db, std::size_t index, typename FieldSpec>
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struct result_field:
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public member_t<FieldSpec, result_field_t<value_type_of<FieldSpec>, Db, FieldSpec>>
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{
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using _field = member_t<FieldSpec, result_field_t<value_type_of<FieldSpec>, Db, FieldSpec>>;
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result_field() = default;
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void _validate()
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{
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_field::operator()()._validate();
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}
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void _invalidate()
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{
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_field::operator()()._invalidate();
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}
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template<typename Target>
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void _bind(Target& target)
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{
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_field::operator()()._bind(target, index);
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}
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};
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template<std::size_t index, typename AliasProvider, typename Db, typename... FieldSpecs>
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struct result_field<Db, index, multi_field_spec_t<AliasProvider, std::tuple<FieldSpecs...>>>:
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public member_t<AliasProvider, result_row_impl<Db, detail::make_field_index_sequence<index, FieldSpecs...>, FieldSpecs...>>
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{
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using _multi_field = member_t<AliasProvider, result_row_impl<Db, detail::make_field_index_sequence<index, FieldSpecs...>, FieldSpecs...>>;
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result_field() = default;
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void _validate()
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{
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_multi_field::operator()()._validate();
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}
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void _invalidate()
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{
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_multi_field::operator()()._invalidate();
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}
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template<typename Target>
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void _bind(Target& target)
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{
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_multi_field::operator()()._bind(target);
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}
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};
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template<typename Db, std::size_t NextIndex, std::size_t... Is, typename... FieldSpecs>
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struct result_row_impl<Db, detail::field_index_sequence<NextIndex, Is...>, FieldSpecs...>:
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public result_field<Db, Is, FieldSpecs>...
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{
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result_row_impl() = default;
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void _validate()
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{
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using swallow = int[];
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(void) swallow{(result_field<Db, Is, FieldSpecs>::_validate(), 0)...};
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}
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void _invalidate()
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{
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using swallow = int[];
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(void) swallow{(result_field<Db, Is, FieldSpecs>::_invalidate(), 0)...};
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}
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template<typename Target>
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void _bind(Target& target)
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{
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using swallow = int[];
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(void) swallow{(result_field<Db, Is, FieldSpecs>::_bind(target), 0)...};
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}
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};
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}
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template<typename Db, typename... FieldSpecs>
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struct result_row_t: public detail::result_row_impl<Db, detail::make_field_index_sequence<0, FieldSpecs...>, FieldSpecs...>
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{
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using _field_index_sequence = detail::make_field_index_sequence<0, FieldSpecs...>;
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using _impl = detail::result_row_impl<Db, _field_index_sequence, FieldSpecs...>;
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bool _is_valid;
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result_row_t():
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_impl(),
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_is_valid(false)
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{
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}
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template<typename DynamicNames>
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result_row_t(const DynamicNames&):
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_impl(),
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_is_valid(false)
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{
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}
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result_row_t(const result_row_t&) = delete;
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result_row_t(result_row_t&&) = default;
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result_row_t& operator=(const result_row_t&) = delete;
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result_row_t& operator=(result_row_t&&) = default;
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void _validate()
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{
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_impl::_validate();
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_is_valid = true;
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}
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void _invalidate()
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{
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_impl::_invalidate();
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_is_valid = false;
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}
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bool operator==(const result_row_t& rhs) const
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{
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return _is_valid == rhs._is_valid;
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}
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explicit operator bool() const
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{
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return _is_valid;
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}
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static constexpr size_t static_size()
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{
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return _field_index_sequence::_next_index;
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}
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template<typename Target>
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void _bind(Target& target)
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{
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_impl::_bind(target);
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}
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};
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template<typename Db, typename... FieldSpecs>
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struct dynamic_result_row_t: public detail::result_row_impl<Db, detail::make_field_index_sequence<0, FieldSpecs...>, FieldSpecs...>
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{
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using _field_index_sequence = detail::make_field_index_sequence<0, FieldSpecs...>;
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using _impl = detail::result_row_impl<Db, _field_index_sequence, FieldSpecs...>;
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struct _field_spec_t
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{
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using _traits = make_traits<text, tag::is_noop, tag::can_be_null, tag::null_is_trivial_value>;
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using _nodes = detail::type_vector<>;
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struct _alias_t {};
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};
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using _field_type = result_field_t<text, Db, _field_spec_t>;
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bool _is_valid;
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std::vector<std::string> _dynamic_field_names;
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std::map<std::string, _field_type> _dynamic_fields;
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dynamic_result_row_t():
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_impl(),
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_is_valid(false)
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{
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}
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dynamic_result_row_t(const std::vector<std::string>& dynamic_field_names):
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_impl(),
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_is_valid(false),
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_dynamic_field_names(dynamic_field_names)
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{
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for (auto field_name : _dynamic_field_names)
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{
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_dynamic_fields.insert({field_name, _field_type{}});
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}
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}
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dynamic_result_row_t(const dynamic_result_row_t&) = delete;
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dynamic_result_row_t(dynamic_result_row_t&&) = default;
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dynamic_result_row_t& operator=(const dynamic_result_row_t&) = delete;
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dynamic_result_row_t& operator=(dynamic_result_row_t&&) = default;
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void _validate()
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{
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_impl::_validate();
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_is_valid = true;
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for (auto& field : _dynamic_fields)
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{
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field.second._validate();
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}
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}
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void _invalidate()
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{
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_impl::_invalidate();
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_is_valid = false;
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for (auto& field : _dynamic_fields)
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{
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field.second._invalidate();
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}
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}
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bool operator==(const dynamic_result_row_t& rhs) const
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{
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return _is_valid == rhs._is_valid;
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}
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const _field_type& at(const std::string& field_name) const
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{
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return _dynamic_fields.at(field_name);
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}
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explicit operator bool() const
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{
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return _is_valid;
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}
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template<typename Target>
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void _bind(Target& target)
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{
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_impl::_bind(target);
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std::size_t index = _field_index_sequence::_next_index;
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for (const auto& field_name : _dynamic_field_names)
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{
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_dynamic_fields.at(field_name)._bind(target, index);
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++index;
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}
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}
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};
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template<typename T>
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struct is_static_result_row_impl
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{
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using type = std::false_type;
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};
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template<typename Db, typename... FieldSpecs>
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struct is_static_result_row_impl<result_row_t<Db, FieldSpecs...>>
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{
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using type = std::true_type;
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};
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template<typename T>
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using is_static_result_row_t = typename is_static_result_row_impl<T>::type;
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}
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#endif
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