java - How to call an Oracle function from Hibernate with a return parameter?

Question

My question is very much like Getting the return value of a PL/SQL function via Hibernate

I have a function which does some modifications internally and it returns a value.

The original idea was to do something like this:

protected Integer checkXXX(Long id, Long transId)
        throws Exception {
    final String sql = "SELECT MYSCHEMA.MYFUNC(" + id + ", "
            + transId + ") FROM DUAL";
    final BigDecimal nr = (BigDecimal) this.getHibernateTemplate()
            .getSessionFactory().getCurrentSession().createSQLQuery(sql)
            .uniqueResult();
    return nr.intValue();
}

Unfortunately this doesn't work with Oracle. What is the recommended way to do something like this?

Is there a way to extract declared variables from within my statement?

Answer 1

Hibernate Session provides a doWork() method that gives you direct access to java.sql.Connection. You can then create and use java.sql.CallableStatement to execute your function:

session.doWork(new Work() {
  public void execute(Connection connection) throws SQLException {
    CallableStatement call = connection.prepareCall("{ ? = call MYSCHEMA.MYFUNC(?,?) }");
    call.registerOutParameter( 1, Types.INTEGER ); // or whatever it is
    call.setLong(2, id);
    call.setLong(3, transId);
    call.execute();
    int result = call.getInt(1); // propagate this back to enclosing class
  }
});