How to call oracle function from ejb3

Question

i'm trying to call an oracle query-function from ejb3.
The oracle function:
create or replace FUNCTION getSecThreadCount(secId in NUMBER,avai in NUMBER)
RETURN SYS_REFCURSOR is cur SYS_REFCURSOR;
m_sql VARCHAR2(250);
BEGIN
m_sql:='select count(thrId) from thread where secId='|| secid||'
and thrAvai='|| avai;
open cur for m_sql;
return cur;
END;
I'v tried several ways to call it,but all failed:
1. the calling code:
public Object getSectionThreadCount(int secId,int avai){
          Query query=manager.createNativeQuery("{call getSecThreadCount(?,?) }");     
          query.setParameter(1, secId);
          query.setParameter(2, avai);
          return query.getSingleResult();
but i got the exception:
Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: ORA-06550: row 1, col 7:
PLS-00221: 'GETSECTHREADCOUNT' not procedure or not defined
ORA-06550: row 1, col 7:
PL/SQL: Statement ignored
2. the calling code:
@SqlResultSetMapping(name = "getSecThreadCount_Mapping")
@NamedNativeQuery(name = "getSecThreadCount",
query = "{?=call getSecThreadCount(:secId,:avai)}",
resultSetMapping = "getSecThreadCount_Mapping",
hints = {@QueryHint(name = "org.hibernate.callable", value = "true"),
          @QueryHint(name = "org.hibernate.readOnly", value = "true")})
public Object getSectionThreadCount(int secId,int avai){
          Query query=manager.createNamedQuery("getSecThreadCount");     
          query.setParameter("secId", secId);
          query.setParameter("avai", avai);
          return query.getSingleResult();
but i run into the exception:
Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query; nested exception is: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
Caused by: java.sql.SQLException: lost in index IN or OUT parameter:: 3
By the way, i have successfully called the function from hibernate. And i use oracle 11g, JBoss5 RC1.
Could anyone tell me how to call the function from EJB3?
Thanks.

Answer 1

Here's a working model:
package.procedure: (created in example schema scott)
CREATE OR REPLACE package  body data_pkg as
  type c_refcursor is ref cursor;
  -- function that return all emps of a certain dept
  function getEmployees ( p_deptId in number
  return c_refcursor
  is
    l_refcursor c_refcursor;
  begin
     open l_refcursor
    for
          select e.empno as emp_id
          ,        e.ename as emp_name
          ,        e.job   as emp_job
          ,        e.hiredate as emp_hiredate
          from   emp e
          where  e.DEPTNO = p_deptId;
    return l_refcursor;
  end getEmployees;
end data_pkg;
/entity class:
package net.app.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedNativeQuery;
import javax.persistence.QueryHint;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@SuppressWarnings("serial")
@Entity
@Table (name="emp")
@SequenceGenerator(name = "EmployeeSequence", sequenceName = "emp_seq")
@NamedNativeQuery( name = "getEmpsByDeptId"
               , query = "{ ? = call data_pkg.getEmployees(?)}"
               , resultClass = Employee.class
               , hints = { @QueryHint(name = "org.hibernate.callable", value = "true")
                      , @QueryHint(name = "org.hibernate.readOnly", value = "true")
public class Employee implements Serializable
    @Id
    @Column(name="emp_id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "EmployeeSequence")
    private int id;
    @Column(name="emp_name")
    private String name;
    @Column(name="emp_job")
    private String job;
    @Column(name="emp_hiredate")
    private Date hiredate;
    // constructor
    public Employee (){}
    // getters and setters
    public int getId()
     return id;
etc...session bean:
package net.app.entity;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
@Stateless
public class ScottAdminImpl implements ScottAdmin
    @PersistenceContext
    private EntityManager entityManager;
    @SuppressWarnings("unchecked")
    public List<Employee> getEmployeesByDeptId(int deptId)
     ArrayList<Employee> empList;
     try
         Query query = entityManager.createNamedQuery("getEmpsByDeptId");
         query.setParameter(1, deptId);
         empList = (ArrayList<Employee>) query.getResultList();
         return empList;
     catch (Exception e)
         e.printStackTrace(System.out);
         return null;
}client:
package net.app.client;
import java.util.List;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import net.app.entity.Employee;
import net.app.iface.ScottAdmin;
public class ScottClient
    public static void main(String[] args)
     try
         // create local interface
         InitialContext ctx = new InitialContext();
         ScottAdmin adminInterface = (ScottAdmin) ctx.lookup("ScottAdminImpl/remote");
         // select employees by deptno
         int deptno = 20;
         List<Employee> empList = adminInterface.getEmployeesByDeptId(deptno);
         // output
         System.out.println("Listing employees:");
         for (Employee emp : empList)
          System.out.println(emp.getId() + ": " + emp.getName() + ", " + emp.getJob() + ", " + emp.getHiredate());
     catch (NamingException e)
         e.printStackTrace(System.out);
}Basically you just ignore the refcursor outbound parameter.
This is a stored function, have yet to try outbound refcursor parameters in stored procedures...
Edited by: _Locutus on Apr 2, 2009 2:37 PM