Tutorial add a test task for ccdb table

Author: dsekihat

Tutorials/CMakeLists.txt

@@ -122,6 +122,11 @@ o2physics_add_dpl_workflow(ccdbaccess
                   PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore O2::CCDB O2::Framework O2Physics::AnalysisCore
                   COMPONENT_NAME AnalysisTutorial)
 
+o2physics_add_dpl_workflow(ccdbtableaccess
+                  SOURCES src/ccdbtableaccess.cxx
+                  PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore O2::CCDB O2::Framework O2Physics::AnalysisCore
+                  COMPONENT_NAME AnalysisTutorial)
+
 o2physics_add_dpl_workflow(weak-decay-iteration
                   SOURCES src/weakDecayIteration.cxx
                   COMPONENT_NAME AnalysisTutorial)

Tutorials/src/ccdbtableaccess.cxx

@@ -0,0 +1,64 @@
+// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+///
+/// \brief A tutorial task to retrieve objects from CCDB given a time stamp.
+/// \author Daiki Sekihata
+/// \since 2026-03-01
+
+#include "Framework/runDataProcessing.h"
+#include "Framework/AnalysisTask.h"
+#include "CCDB/BasicCCDBManager.h"
+#include "DataFormatsCalibration/MeanVertexObject.h"
+#include "DataFormatsParameters/GRPMagField.h"
+#include "DataFormatsParameters/GRPObject.h"
+#include "CommonDataFormat/InteractionRecord.h"
+
+#include <chrono>
+
+using namespace o2::framework;
+using namespace o2::header;
+using namespace o2;
+
+namespace o2::aod
+{
+namespace testccdb
+{
+DECLARE_SOA_CCDB_COLUMN(GRPObject, grpObject, o2::parameters::GRPObject, "GLO/GRP/GRP"); //!
+DECLARE_SOA_CCDB_COLUMN(GRPMagField, grpMagField, o2::parameters::GRPMagField, "GLO/Config/GRPMagField"); //!
+} // namespace testccdb
+
+DECLARE_SOA_TIMESTAMPED_TABLE(MyCCDBObjects, aod::Timestamps, o2::aod::timestamp::Timestamp, 1, "MYCCDBOBJ", //!
+                              testccdb::GRPObject, testccdb::GRPMagField);
+} // namespace o2::aod
+
+struct TestCCDBTable {
+
+  void init(o2::framework::InitContext&) {}
+
+  using MyBCs = soa::Join<aod::BCsWithTimestamps, aod::MyCCDBObjects>;
+  // using MyBCs = soa::Join<aod::BCs, aod::MyCCDBObjects>;
+
+  void process(MyBCs const& bcs)
+  {
+    for (const auto& bc: bcs) {
+      float bz = bc.grpObject().getNominalL3Field();
+      float l3current = bc.grpMagField().getL3Current();
+      LOGF(info, "bc.timestamp() = %lld, bz = %f kG, %f A", bc.timestamp(), bz, l3current);
+    }
+  }
+};
+
+WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
+{
+  return WorkflowSpec{
+    adaptAnalysisTask<TestCCDBTable>(cfgc),
+  };
+}