how to call stored procedure with multiple in and out parameters using entity manager

Question

We are facing an issue while calling the stored procedure from the application. The database is oracle 10g This proc has 2 input parameters and 2 output parameters.

Input 1:- DB-List Input 2:- String

Output 1:-Again a DB-List Output 2:- Number

When we are trying to use

 Query q = session.createSQLQuery("{call proc_name(?,?,?,?)}");

We cannot distinguish between in parameters and out parameters. So how should we handle it by using this.

Also, We tried to use callable statement as follows:

Session session = (Session) getEntityManager().getDelegate();
SessionImpl sessionImpl = ((SessionImpl) getEntityManager().getDelegate());
Connection cc = sessionImpl.connection();
CallableStatement callableStatement = null;

callableStatement = cc.prepareCall("{call proc_name(?,?,?,?)}");
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("DB_LIST",callableStatement.getConnection());
ARRAY paramArray = new ARRAY(descriptor, callableStatement.getConnection(), array);
callableStatement.setArray(1, paramArray);
callableStatement.setString(2, "N");
callableStatement.registerOutParameter(3, OracleTypes.ARRAY, "DB_RETURN_LIST");
callableStatement.registerOutParameter(4, Types.INTEGER);
// executing the query
callableStatement.execute();

We get the following error:

javax.ejb.EJBException: java.lang.ClassCastException: 
$Proxy50 cannot be cast to oracle.jdbc.OracleConnection

Can you please provide some suggestions.

This is the Entity Manager that we are using

public abstract class GenericDAO<T, ID extends Serializable> implements IGenericDAO<T, ID> {
private final Class<T> persistentClass;
@PersistenceContext(unitName = "firstPersistenceUnit")
@Produces
private EntityManager entityManager;

public void setEntityManager(final EntityManager entityManager) throws DataAccessException {
this.entityManager = entityManager;
}

public EntityManager getEntityManager() throws DataAccessException {
return entityManager;
}
}

Here is the entry in the Persistance.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="firstPersistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jboss/firstDataSource</jta-data-source>
<class>com.domain.Branch</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<validation-mode>AUTO</validation-mode>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
        <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
        <property name="hibernate.show_sql" value="true"/>
        <property name="hibernate.format_sql" value="true"/>
    </properties>
</persistence-unit>

<persistence-unit name="secondPersistenceUnit">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jboss/secondDataSource</jta-data-source>
<class>com.domain.PocJeeCounty</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
<validation-mode>AUTO</validation-mode>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
        <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" />
        <property name="hibernate.show_sql" value="true"/>
        <property name="hibernate.format_sql" value="true"/>
    </properties>
</persistence-unit>
</persistence>

Answer 1

Dont use second way, instead create and define query and query parameters using @NamedStoredProcedureQuery and @StoredProcedureParameter. Following is the code for your requirement

@NamedStoredProcedureQuery(  
    name="PROC_NAME",  
    procedureName="proc_name",  
    returnsResultSet=true/false,  
    parameters={  
        @StoredProcedureParameter(queryParameter="param1",name="p1",direction=Direction.IN,type=Integer.class),  
        @StoredProcedureParameter(queryParameter="param2",name="p2",direction=Direction.IN,type=Timestamp.class),  
        @StoredProcedureParameter(queryParameter="param3",name="p3",direction=Direction.OUT,type=String.class),  
        @StoredProcedureParameter(queryParameter="param4",name="p4",direction=Direction.OUT,type=Integer.class)  
    }  
    )

and use em.createNativeQuery() method