Is it possible to pass a null parameter to a stored procedure in Java JPA 2.1?

Question

Using the new JPA 2.1 stored procedure call, is there any way to pass a null parameter?

Here is an example usage:

StoredProcedureQuery storedProcedur         


        

Answer 1

Yes, it is possible to pass null params to stored procedures when using JPA StoredProcedureQuery.

You have to add the following property in application.properties file and register the parameters with their name.

spring.jpa.properties.hibernate.proc.param_null_passing=true

Example:

StoredProcedureQuery q = em.createStoredProcedureQuery(Globals.SPROC_PROBLEM_COMMENT2, ProblemCommentVO.class);
q.registerStoredProcedureParameter("Patient_ID", Long.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param2", Long.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param3", Long.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param4", Integer.class, ParameterMode.OUT);
q.setParameter("Patient_ID", patientId);
q.setParameter("Param2", null);//passing null value to Param2
q.setParameter("Param3", null);

List pComments = q.getResultList();
Integer a = (Integer) q.getOutputParameterValue("Param4");