added connection impl class

include/matador/sql/record.hpp

@@ -0,0 +1,56 @@
+#ifndef QUERY_RECORD_HPP
+#define QUERY_RECORD_HPP
+
+#include "matador/sql/column.hpp"
+
+#include <vector>
+#include <unordered_map>
+
+namespace matador::sql {
+
+class record
+{
+private:
+  using column_by_index = std::vector<column>;
+  using column_index_pair = std::pair<std::reference_wrapper<column>, size_t>;
+  using column_by_name_map = std::unordered_map<std::string, column_index_pair>;
+
+public:
+  using iterator = column_by_index::iterator;
+  using const_iterator = column_by_index::const_iterator;
+
+  record() = default;
+  record(std::initializer_list<column> columns);
+  ~record() = default;
+
+  template < typename Type >
+  void append(const std::string &name, long size = -1)
+  {
+    append(make_column<Type>(name, size));
+  }
+
+  void append(column col);
+
+  [[nodiscard]] const column& at(const std::string &name) const;
+  const column& at(size_t index);
+
+  iterator find(const std::string &column_name);
+  const_iterator find(const std::string &column_name) const;
+
+  iterator begin();
+  [[nodiscard]] const_iterator begin() const;
+  [[nodiscard]] const_iterator cbegin() const;
+
+  iterator end();
+  [[nodiscard]] const_iterator end() const;
+  [[nodiscard]] const_iterator cend() const;
+
+  [[nodiscard]] size_t size() const;
+
+private:
+  column_by_index columns_;
+  column_by_name_map columns_by_name_;
+};
+
+}
+#endif //QUERY_RECORD_HPP