initial matador ng commit

include/matador/sql/executor.hpp

@@ -0,0 +1,28 @@
+#ifndef EXECUTOR_HPP
+#define EXECUTOR_HPP
+
+#include "matador/utils/error.hpp"
+#include "matador/utils/result.hpp"
+
+#include <memory>
+
+namespace matador::sql {
+
+struct query_context;
+class query_result_impl;
+class statement;
+
+class executor {
+public:
+  virtual ~executor();
+
+  [[nodiscard]] virtual const class dialect& dialect() const = 0;
+  [[nodiscard]] virtual utils::result<size_t, utils::error> execute(const query_context &ctx) const = 0;
+  [[nodiscard]] virtual utils::result<std::unique_ptr<query_result_impl>, utils::error> fetch(const query_context &ctx) const = 0;
+  [[nodiscard]] virtual utils::result<statement, utils::error> prepare(const query_context &ctx) const = 0;
+  [[nodiscard]] virtual std::string str(const query_context &ctx) const = 0;
+};
+
+}
+
+#endif //EXECUTOR_HPP