Query creation in Spring Data - dynamic where clause

Question

Is there a way in Spring data to dynamically form the where clause?

What I want to do is have a method (which is like the findBy / get method) which runs a WHERE and

Answer 1

A even more simple option is to test if the parameter is null right in the JPQL query:

Exemple from my project:

@Query("select m from MessageEntity m " +
            "join fetch m.demandeAnalyseEntities d " +
            "where (:patientId is null or d.noPtn= :patientId) " +
            " and " +
            " ( :labNbr is null or d.noLab= :labNbr) " +
            " and " +
            " ( :reqDate is null or d.dteReq= :reqDate) " +
            " and " +
            " ( :reqNum is null or d.noReq= :reqNum) "
    )
    List findMessagesWithDemandesOnly(@Param("patientId") Long pid,
                                                     @Param("labNbr") Integer labNo,
                                                     @Param("reqDate") String reqDate,
                                                     @Param("reqNum") Integer reqNum,
                                                     Pageable pageable);