syntax error at or near TO (ROLLBACK TO SAVEPOINT)

Question

The following sql is a part from a FUNCTION ,i want to rollback to rbk SAVEPOINT :

  for ptrEnt in entite loop
      -- positionnement du point de retour pour une entité
    savepoint rbk;
      -- purge de la table des redevances de l''entite
    test := pckg_activ.initredevanceentite(ptrEnt.cod_ent);
      -- calcul de la redevance
      test := pckg_activ.calculredevanceentite(ptrEnt.cod_ent);
    -- controle calcul de la bonne execution pour l''entité
    if (test = 0) then
        -- initialisation des departements associes a une entite
        test := pckg_activ.initdepartement(ptrEnt.cod_ent);
      -- validation des modifications
      commit;
      -- generation de l''etat recapitulatif
      test := pckg_activ.recapentitegestionnaire(ptrEnt.cod_ent,ficHisto);
    else
        rollback TO SAVEPOINT rbk;
      report := jour + 7;
      update sav_rdv_date
          set date_dem = report
          where cod_ent = ptrEnt.cod_ent;
        RAISE NOTICE '!!erreur de patrimoine => abandon du traitement pour cette entite';
      commit;
    end if;
  end loop;

entite is a cursor that has been declared and the for loop is in a BEGIN bloc.

I get the error ERROR: syntax error at or near "TO". I think that the syntax is correct , it it related to the cursor ?

Answer 1

You cannot use transaction management statements in PostgreSQL functions.

Limited support for that was added in procedures, introduced in v11.

But you can (implicitly) use savepoints by using an EXCEPTION clause in a block.

So instead of

LOOP
   SAVEPOINT a;

   /* something */

   IF /* something else */ THEN
      ROLLBACK TO SAVEPOINT a;
      /* still more */
   END IF;
END LOOP;

you should use

LOOP
   BEGIN
      /* something */

      IF /* something else */ THEN
         RAISE EXCEPTION 'catchme';
      END IF;
   EXCEPTION
      WHEN raise_exception THEN
         /* still more */
   END;
END LOOP;