implemented lazy loading for object_ptr and belongs_to

2026-01-15 12:40:54 +01:00
parent db8e137c11
commit 7626331866
81 changed files with 1790 additions and 927 deletions
@@ -0,0 +1,51 @@
+#ifndef MATADOR_IDENTIFIER_READER_HPP
+#define MATADOR_IDENTIFIER_READER_HPP
+
+#include "matador/utils/access.hpp"
+#include "matador/utils/identifier.hpp"
+#include "matador/utils/primary_key_attribute.hpp"
+
+namespace matador::sql {
+class query_result_reader;
+}
+
+namespace matador::sql::internal {
+class identifier_reader final {
+public:
+  explicit identifier_reader(query_result_reader &reader);
+
+  template<class Type>
+  utils::identifier read(const Type &obj, const size_t column_index) {
+    identifier_.clear();
+    column_index_ = column_index;
+    access::process(*this, obj);
+    return identifier_;
+  }
+
+  template<typename ValueType>
+  void on_primary_key(const char *id, ValueType &value, const utils::primary_key_attribute& attr = utils::default_pk_attributes) {
+    utils::data_type_traits<ValueType>::read_value(reader_, id, column_index_, value, attr.size());
+    identifier_ = value;
+  }
+
+  static void on_revision(const char * /*id*/, uint64_t &/*rev*/) {}
+  template < class Type >
+  static void on_attribute(const char * /*id*/, Type &/*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
+  template < class Pointer >
+  static void on_belongs_to(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
+  template < class Pointer >
+  static void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
+  template<class ContainerType>
+  static void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
+  template<class ContainerType>
+  static 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*/) {}
+  template<class ContainerType>
+  static void on_has_many_to_many(const char * /*id*/, ContainerType & /*c*/, const utils::foreign_attributes &/*attr*/) {}
+
+private:
+  query_result_reader &reader_;
+  size_t column_index_{};
+  utils::identifier identifier_;
+};
+}
+#endif //MATADOR_IDENTIFIER_READER_HPP