dev/implementations/table_definitions.h - master - UCS/sqlite_orm

dev/implementations/table_definitions.h

53 строки2 KB

klaus triendl

Renamed everything related to former 'storage impl' to 'db object'

05 июн 2022, 11:52

05 июн 2022, 11:529726e82

/** @file Mainly existing to disentangle implementation details from circular and cross dependencies
 *  (e.g. column_t -> default_value_extractor -> serializer_context -> db_objects_tuple -> table_t -> column_t)
 *  this file is also used to provide definitions of interface methods 'hitting the database'.
 */
#pragma once
#include <type_traits>  //  std::decay_t
#include <utility>  //  std::move
#include <algorithm>  //  std::find_if, std::ranges::find

#include "../type_printer.h"
#include "../column.h"
#include "../table.h"

namespace sqlite_orm {
    namespace internal {

        template<class T, bool WithoutRowId, class... Cs>
        std::vector<table_xinfo> table_t<T, WithoutRowId, Cs...>::get_table_info() const {
            std::vector<table_xinfo> res;
            res.reserve(size_t(filter_tuple_sequence_t<elements_type, is_column>::size()));
            this->for_each_column([&res](auto& column) {
                using field_type = field_type_t<std::decay_t<decltype(column)>>;
                std::string dft;
                if(auto d = column.default_value()) {
                    dft = move(*d);
                }
                res.emplace_back(-1,
                                 column.name,
                                 type_printer<field_type>().print(),
                                 column.is_not_null(),
                                 dft,
                                 column.template is<is_primary_key>(),
                                 column.is_generated());
            });
            auto compositeKeyColumnNames = this->composite_key_columns_names();
            for(size_t i = 0; i < compositeKeyColumnNames.size(); ++i) {
                auto& columnName = compositeKeyColumnNames[i];
#if __cpp_lib_ranges >= 201911L
                auto it = std::ranges::find(res, columnName, &table_xinfo::name);
#else
                auto it = std::find_if(res.begin(), res.end(), [&columnName](const table_xinfo& ti) {
                    return ti.name == columnName;
                });
#endif
                if(it != res.end()) {
                    it->pk = static_cast<int>(i + 1);
                }
            }
            return res;
        }

    }
}