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

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

There are few ways to achieve this. Mainly the solution depends on the hibernate version you are using.

Hibernate 4.3+

Session session = em.unwrap(Session.class);
ProcedureCall procedure = session.createStoredProcedureCall(Constants.MY_PROCEDURE_NAME);

q.registerStoredProcedureParameter("Patient_ID", Long.class, ParameterMode.IN).enablePassingNulls(true);
q.registerStoredProcedureParameter("Param2", String.class, ParameterMode.IN).enablePassingNulls(true);
q.registerStoredProcedureParameter("Param3", Long.class, ParameterMode.IN).enablePassingNulls(true);
q.registerStoredProcedureParameter("Param4", Integer.class, ParameterMode.OUT);

q.setParameter("Param1", patientId);
q.setParameter("Param2", null);//passing null value to Param2
q.setParameter("Param3", null);//passing null value to Param3

List<> results = q.getResultList();
Integer a = (Integer) q.getOutputParameterValue("Param4");

Older Versions

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(Constants.MY_PROCEDURE_NAME, ResultData.class);
q.registerStoredProcedureParameter("Patient_ID", Long.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param2", String.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param3", Long.class, ParameterMode.IN);
q.registerStoredProcedureParameter("Param4", Integer.class, ParameterMode.OUT);
q.setParameter("Param1", patientId);
q.setParameter("Param2", null);//passing null value to Param2
q.setParameter("Param3", null);//passing null value to Param3

List<> results = q.getResultList();
Integer a = (Integer) q.getOutputParameterValue("Param4");