178 lines
6.6 KiB
C++
178 lines
6.6 KiB
C++
#ifndef QUERY_QUERY_RESULT_IMPL_HPP
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#define QUERY_QUERY_RESULT_IMPL_HPP
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#include "matador/utils/access.hpp"
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#include "matador/utils/field_attributes.hpp"
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#include "matador/utils/foreign_attributes.hpp"
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#include "matador/utils/default_type_traits.hpp"
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#include "matador/sql/interface/query_result_reader.hpp"
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#include "matador/object/attribute_definition.hpp"
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#include <memory>
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#include <string>
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#include <typeindex>
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#include <unordered_set>
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namespace matador::utils {
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class value;
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}
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namespace matador::sql {
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namespace detail {
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class pk_reader
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{
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public:
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explicit pk_reader(query_result_reader &reader);
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template<class Type>
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void read(Type &obj, const size_t column_index)
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{
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column_index_ = column_index;
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access::process(*this, obj);
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}
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template<typename ValueType>
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void on_primary_key(const char *id, ValueType &value, std::enable_if_t<std::is_integral_v<ValueType> && !std::is_same_v<bool, ValueType>>* = nullptr);
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void on_primary_key(const char *id, std::string &value, size_t size);
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void on_revision(const char * /*id*/, unsigned long long &/*rev*/) {}
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template < class Type >
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void on_attribute(const char * /*id*/, Type &/*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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template < class Pointer >
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void on_belongs_to(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
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template < class Pointer >
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void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const utils::foreign_attributes &/*attr*/) {}
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private:
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size_t column_index_{};
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query_result_reader &reader_;
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};
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}
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class query_result_impl
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{
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public:
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query_result_impl(std::unique_ptr<query_result_reader> &&reader, std::vector<object::attribute_definition> &&prototype, size_t column_index = 0);
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query_result_impl(std::unique_ptr<query_result_reader> &&reader, const std::vector<object::attribute_definition> &prototype, size_t column_index = 0);
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template<typename ValueType>
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void on_primary_key(const char *id, ValueType &value, std::enable_if_t<std::is_integral_v<ValueType> && !std::is_same_v<bool, ValueType>>* = nullptr)
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{
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utils::data_type_traits<ValueType>::read_value(*reader_, id, column_index_++, value);
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}
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void on_primary_key(const char *id, std::string &value, size_t size);
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void on_revision(const char *id, uint64_t &rev);
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template < class Type >
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void on_attribute(const char *id, Type &x, const utils::field_attributes &/*attr*/ = utils::null_attributes)
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{
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utils::data_type_traits<Type>::read_value(*reader_, id, column_index_++, x);
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}
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void on_attribute(const char *id, char *value, const utils::field_attributes &attr = utils::null_attributes);
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void on_attribute(const char *id, std::string &value, const utils::field_attributes &attr = utils::null_attributes);
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void on_attribute(const char *id, utils::value &val, const utils::field_attributes &attr = utils::null_attributes);
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template < class Pointer >
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void on_belongs_to(const char * /*id*/, Pointer &x, const utils::foreign_attributes &attr) {
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if (x.empty()) {
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x = new typename Pointer::value_type;
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}
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if (attr.fetch() == utils::fetch_type::LAZY) {
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pk_reader_.read(*x, column_index_++);
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} else if (const auto ti = std::type_index(typeid(*x)); processed_types_.count(ti) == 0) {
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processed_types_.insert(ti);
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access::process(*this, *x);
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}
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}
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template < class Pointer >
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void on_has_one(const char * /*id*/, Pointer &x, const utils::foreign_attributes &attr)
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{
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if (x.empty()) {
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x = new typename Pointer::value_type;
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}
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if (attr.fetch() == utils::fetch_type::LAZY) {
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pk_reader_.read(*x, column_index_++);
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} else if (const auto ti = std::type_index(typeid(*x)); processed_types_.count(ti) == 0) {
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processed_types_.insert(ti);
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}
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}
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template<class ContainerType>
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void on_has_many_to_many(const char *, ContainerType &, const char * /*join_column*/, const char * /*inverse_join_column*/, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *, ContainerType &, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many(const char * /*id*/, ContainerType &cont, const char * /*join_column*/, const utils::foreign_attributes &attr) {
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if ( attr.fetch() == utils::fetch_type::LAZY ) {
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// pk_reader_.read(*id, column_index_++);
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} else if (const auto ti = std::type_index(typeid(typename ContainerType::value_type::value_type)); processed_types_.count(ti) == 0) {
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processed_types_.insert(ti);
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auto obj = std::make_unique<typename ContainerType::value_type::value_type>();
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// typename ContainerType::value_type x(new typename ContainerType::value_type::value_type);
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access::process(*this, *obj);
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auto ptr = typename ContainerType::value_type(obj.release());
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const auto pk = ptr.primary_key();
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if (ptr.primary_key().is_valid()) {
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cont.push_back(ptr);
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}
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}
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}
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template<class ContainerType>
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void on_has_many(const char *, ContainerType &, const utils::foreign_attributes &/*attr*/) {}
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template<class Type>
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void bind(const Type &obj)
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{
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reader_->bind(obj);
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}
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template<class Type>
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bool fetch(Type &obj)
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{
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column_index_ = reader_->start_column_index();
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auto fetched = reader_->fetch();
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if (!fetched.is_ok()) {
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return false;
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}
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if (!*fetched) {
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return false;
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}
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processed_types_.insert(typeid(Type));
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access::process(*this, obj);
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return true;
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}
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[[nodiscard]] const std::vector<object::attribute_definition>& prototype() const;
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protected:
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size_t column_index_ = 0;
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std::vector<object::attribute_definition> prototype_;
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std::unique_ptr<query_result_reader> reader_;
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detail::pk_reader pk_reader_;
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std::unordered_set<std::type_index> processed_types_;
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};
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namespace detail {
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template<typename ValueType>
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void pk_reader::on_primary_key(const char *id, ValueType &value, std::enable_if_t<std::is_integral_v<ValueType> && !std::is_same_v<bool, ValueType>> *)
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{
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utils::data_type_traits<ValueType>::read_value(reader_, id, column_index_++, value);
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}
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}
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}
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#endif //QUERY_QUERY_RESULT_IMPL_HPP
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