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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.
294 lines
8.2 KiB
C++
294 lines
8.2 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_RESULT_ROW_H
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#define SQLPP_RESULT_ROW_H
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#include <map>
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#include <sqlpp11/vendor/char_result_row.h>
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#include <sqlpp11/vendor/field.h>
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#include <sqlpp11/text.h>
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#include <sqlpp11/detail/column_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... NamedExprs>
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struct result_row_impl;
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template<typename Db, std::size_t index, typename NamedExpr>
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struct result_field:
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public NamedExpr::_name_t::template _member_t<typename value_type_of<NamedExpr>::template _result_entry_t<Db, NamedExpr::_trivial_value_is_null>>
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{
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using _field = typename NamedExpr::_name_t::template _member_t<typename value_type_of<NamedExpr>::template _result_entry_t<Db, NamedExpr::_trivial_value_is_null>>;
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result_field() = default;
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result_field(const char_result_row_t& char_result_row_t):
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_field({{char_result_row_t.data[index], char_result_row_t.len[index]}})
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{
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}
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result_field& operator=(const char_result_row_t& char_result_row_t)
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{
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_field::operator()().assign(char_result_row_t.data[index], char_result_row_t.len[index]);
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return *this;
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}
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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... NamedExprs>
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struct result_field<Db, index, vendor::multi_field_t<AliasProvider, std::tuple<NamedExprs...>>>:
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public AliasProvider::_name_t::template _member_t<result_row_impl<Db, detail::make_column_index_sequence<index, NamedExprs...>, NamedExprs...>>
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{
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using _multi_field = typename AliasProvider::_name_t::template _member_t<result_row_impl<Db, detail::make_column_index_sequence<index, NamedExprs...>, NamedExprs...>>;
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result_field() = default;
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result_field(const char_result_row_t& char_result_row_t):
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_multi_field({char_result_row_t})
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{}
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result_field& operator=(const char_result_row_t& char_result_row_t)
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{
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_multi_field::operator()() = char_result_row_t;
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return *this;
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}
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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 LastIndex, std::size_t... Is, typename... NamedExprs>
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struct result_row_impl<Db, detail::column_index_sequence<LastIndex, Is...>, NamedExprs...>:
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public result_field<Db, Is, NamedExprs>...
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{
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static constexpr std::size_t _last_index = LastIndex;
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result_row_impl() = default;
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result_row_impl(const char_result_row_t& char_result_row):
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result_field<Db, Is, NamedExprs>(char_result_row)...
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{
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}
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result_row_impl& operator=(const char_result_row_t& char_result_row)
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{
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using swallow = int[];
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(void) swallow{(result_field<Db, Is, NamedExprs>::operator=(char_result_row), 0)...};
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return *this;
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}
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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, NamedExprs>::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, NamedExprs>::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, NamedExprs>::_bind(target), 0)...};
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}
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};
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}
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template<typename Db, typename... NamedExprs>
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struct result_row_t: public detail::result_row_impl<Db, detail::make_column_index_sequence<0, NamedExprs...>, NamedExprs...>
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{
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using _impl = detail::result_row_impl<Db, detail::make_column_index_sequence<0, NamedExprs...>, NamedExprs...>;
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bool _is_valid;
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static constexpr size_t _last_static_index = _impl::_last_index;
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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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result_row_t& operator=(const char_result_row_t& char_result_row_t)
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{
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_impl::operator=(char_result_row_t);
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_is_valid = true;
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return *this;
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}
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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 _last_static_index;
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}
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template<typename Target>
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void bind_result(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... NamedExprs>
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struct dynamic_result_row_t: public detail::result_row_impl<Db, detail::make_column_index_sequence<0, NamedExprs...>, NamedExprs...>
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{
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using _impl = detail::result_row_impl<Db, detail::make_column_index_sequence<0, NamedExprs...>, NamedExprs...>;
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using _field_type = detail::text::_result_entry_t<Db, false>;
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static constexpr size_t _last_static_index = _impl::_last_index;
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bool _is_valid;
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std::vector<std::string> _dynamic_columns;
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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_columns):
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_impl(),
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_is_valid(false),
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_dynamic_columns(dynamic_columns)
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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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dynamic_result_row_t& operator=(const char_result_row_t& char_result_row)
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{
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_impl::operator=(char_result_row);
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_is_valid = true;
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char_result_row_t dynamic_row = char_result_row;
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dynamic_row.data += _last_static_index;
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dynamic_row.len += _last_static_index;
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for (const auto& column : _dynamic_columns)
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{
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_dynamic_fields[column].assign(dynamic_row.data[0], dynamic_row.len[0]);
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++dynamic_row.data;
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++dynamic_row.len;
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}
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return *this;
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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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};
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}
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#endif
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