added sqlite query result and enhanced column generator and value extractor

test/models/supplier.hpp

@@ -0,0 +1,25 @@
+#ifndef QUERY_SUPPLIER_HPP
+#define QUERY_SUPPLIER_HPP
+
+#include "matador/utils/access.hpp"
+
+#include <string>
+
+namespace matador::test {
+
+struct supplier
+{
+  unsigned long id{};
+  std::string name;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::utils::access;
+    using namespace matador::utils;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "name", name, 255);
+  }
+};
+
+}
+#endif //QUERY_SUPPLIER_HPP