initial matador ng commit

backends/postgres/src/postgres_statement.cpp

@@ -12,27 +12,48 @@ postgres_statement::postgres_statement(PGconn *db, PGresult *result, std::string
 , binder_(query_.bind_vars.size())
 {}
 
-size_t postgres_statement::execute()
+utils::result<size_t, utils::error> postgres_statement::execute()
 {
-  PGresult *res = PQexecPrepared(db_, name_.c_str(), static_cast<int>(binder_.params().size()), binder_.params().data(), nullptr, nullptr, 0);
+  PGresult *res = PQexecPrepared(db_,
+      name_.c_str(),
+      static_cast<int>(binder_.params().values.size()),
+      binder_.params().values.data(),
+      binder_.params().lengths.data(),
+      binder_.params().formats.data(),
+      0);
 
-  throw_postgres_error(res, db_, "postgres", query_.sql);
+  if (is_result_error(res)) {
+    return utils::failure(make_error(sql::error_code::EXECUTE_FAILED, res, db_, "Failed to execute statement", query_.sql));
+  }
 
-  return std::stoul(PQcmdTuples(res));
+  const auto *tuples = PQcmdTuples(res);
+  if (strlen(tuples) == 0) {
+    return utils::ok(static_cast<size_t>(0));
+  }
+
+  return utils::ok(static_cast<size_t>(std::stoul(tuples)));
 }
 
-std::unique_ptr<sql::query_result_impl> postgres_statement::fetch()
+utils::result<std::unique_ptr<sql::query_result_impl>, utils::error> postgres_statement::fetch()
 {
-  PGresult *res = PQexecPrepared(db_, name_.c_str(), static_cast<int>(binder_.params().size()), binder_.params().data(), nullptr, nullptr, 0);
+  PGresult *res = PQexecPrepared(db_,
+      name_.c_str(),
+      static_cast<int>(binder_.params().values.size()),
+      binder_.params().values.data(),
+      binder_.params().lengths.data(),
+      binder_.params().formats.data(),
+      0);
 
-  throw_postgres_error(res, db_, "postgres", query_.sql);
+  if (is_result_error(res)) {
+    return utils::failure(make_error(sql::error_code::FETCH_FAILED, res, db_, "Failed to fetch statement", query_.sql));
+  }
 
-  return std::move(std::make_unique<sql::query_result_impl>(std::make_unique<postgres_result_reader>(res), std::move(query_.prototype)));
+  return utils::ok(std::make_unique<sql::query_result_impl>(std::make_unique<postgres_result_reader>(res), query_.prototype));
 }
 
 void postgres_statement::reset() {}
 
-sql::parameter_binder& postgres_statement::binder()
+utils::attribute_writer& postgres_statement::binder()
 {
   return binder_;
 }