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Difference between revisions of "EclipseLink/Examples/JPA/StoredProcedures"

(Oracle stored procedure using OUT CURSOR)
Line 20: Line 20:
 
=== Oracle stored procedure using OUT CURSOR ===
 
=== Oracle stored procedure using OUT CURSOR ===
 
<source lang="sql">
 
<source lang="sql">
CREATE PROCEDURE EMP_READ_ALL
+
CREATE PROCEDURE EMP_READ_ALL (
 +
RESULT_CURSOR OUT CURSOR_TYPE.ANY_CURSOR) AS
 +
BEGIN
 +
OPEN RESULT_CURSOR FOR Select e.*, s.* from EMPLOYEE e, SALARY s WHERE e.EMP_ID = s.EMP_ID;
 +
END;
 
</source>
 
</source>
  

Revision as of 10:43, 1 February 2011


EclipseLink has extended support for stored procedure execution including:

A stored procedure call be used in any query to read objects, or read or modify raw data.

Any CRUD or mapping operation can also be overridden using a stored procedure call using a DescriptorCustomizer and the DescriptorQueryManager API.

See,

Oracle stored procedure using OUT CURSOR

CREATE PROCEDURE EMP_READ_ALL (
	RESULT_CURSOR OUT CURSOR_TYPE.ANY_CURSOR) AS
BEGIN 
OPEN RESULT_CURSOR FOR SELECT e.*, s.* FROM EMPLOYEE e, SALARY s WHERE e.EMP_ID = s.EMP_ID; 
END;

Using JpaEntityManager createQuery() API to execute a stored procedure

import javax.persistence.Query;
import org.eclipse.persistence.queries.StoredProcedureCall;
import org.eclipse.persistence.queries.ReadAllQuery;
 
ReadAllQuery databaseQuery = new ReadAllQuery(Employee.class);
StoredProcedureCall call = new StoredProcedureCall();
call.setProcedureName("EMP_READ_ALL");
call.useNamedCursorOutputAsResultSet("RESULT_SET");
databaseQuery.setCall(call);
 
Query query = ((JpaEntityManager)entityManager.getDelegate()).createQuery(databaseQuery);
List<Employee> result = query.getResultList();

Using @NamedStoredProcedureQuery to define a stored procedure

@NamedStoredProcedureQuery(name="findAllEmployees", procedureName="EMP_READ_ALL", resultClass=Employee.class, parameters={
  @StoredProcedureParameter(queryParameter="result", name="RESULT_SET", direction=Direction.OUT_CURSOR})
@Entity
public class Employee {
 ...
}

Using named query

Query query = entityManager.createNamedQuery("findAllEmployees");
List<Employee> result = query.getResultList();