initial matador ng commit

include/matador/sql/interface/statement_impl.hpp

@@ -0,0 +1,62 @@
+#ifndef QUERY_STATEMENT_IMPL_HPP
+#define QUERY_STATEMENT_IMPL_HPP
+
+#include "matador/sql/query_context.hpp"
+#include "matador/sql/internal/query_result_impl.hpp"
+#include "matador/sql/object_parameter_binder.hpp"
+
+#include "matador/utils/data_type_traits.hpp"
+
+#include <memory>
+
+namespace matador::sql {
+
+class sql_error;
+
+class statement_impl
+{
+protected:
+  explicit statement_impl(query_context query);
+
+public:
+  virtual ~statement_impl() = default;
+
+  virtual utils::result<size_t, utils::error> execute() = 0;
+  virtual utils::result<std::unique_ptr<query_result_impl>, utils::error> fetch() = 0;
+
+  template < class Type >
+  void bind_object(Type &obj)
+  {
+    object_parameter_binder object_binder_;
+    object_binder_.reset(start_index());
+    object_binder_.bind(obj, binder());
+  }
+
+  template < class Type >
+  void bind(const size_t pos, Type &val)
+  {
+    utils::data_type_traits<Type>::bind_value(binder(), adjust_index(pos), val);
+  }
+
+  void bind(size_t pos, const char *value, size_t size);
+  void bind(size_t pos, std::string &val, size_t size);
+
+  virtual void reset() = 0;
+
+  [[nodiscard]] const std::vector<std::string>& bind_vars() const;
+  [[nodiscard]] bool is_valid_host_var(const std::string &host_var, size_t pos) const;
+
+protected:
+  virtual utils::attribute_writer& binder() = 0;
+  [[nodiscard]] virtual size_t start_index() const;
+  [[nodiscard]] virtual size_t adjust_index(size_t index) const;
+
+protected:
+  friend class statement;
+
+  query_context query_;
+};
+
+}
+
+#endif //QUERY_STATEMENT_IMPL_HPP