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EclipseLink/Examples/JPA/StoredProcedures

< EclipseLink‎ | Examples‎ | JPA
Revision as of 09:44, 24 July 2012 by Ronaldoblanc.gmail.com (Talk | contribs)

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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_CURSOR");
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_CURSOR", name="result", direction=Direction.OUT_CURSOR)})
@Entity
public class Employee {
 ...
}

Using named query

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

PLSQLStoredProcedureCall - Complex data

See a real complex sample at http://ronaldoblanc.blogspot.com.br/2012/05/jpa-eclipselink-and-complex-parameters.html (Blog)