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Re: [eclipselink-users] Spring Users Unite!
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Here is the GenericDAO
Note:- CrudService is simple..just inject the below GenericDAO
Difficult to share the pagination framework. But spring and
eclipselink make the things easier.
Suggestion:- Think of abstracting
Search/SortCriteria/PageInput(since of pagination) offcourse Pageoutput and
use PageIterator design pattern
import java.io.Serializable;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import javax.persistence.Query;
import org.eclipse.persistence.internal.jpa.EntityManagerImpl;
import org.eclipse.persistence.queries.ReadAllQuery;
import org.eclipse.persistence.queries.ReadObjectQuery;
import org.eclipse.persistence.sessions.Session;
import org.springframework.orm.jpa.JpaCallback;
import org.springframework.orm.jpa.support.JpaDaoSupport;
import org.springframework.util.Assert;
import com.oracle.healthinsurance.model.entity.Persistable; // all entities
extends the interface persistable
public class GenericDAOJPAImpl<T extends Persistable> extends JpaDaoSupport
implements GenericDAO<T> {
public void create(final T t) {
Object retVal= getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
em.persist(t);
return null;
}
});
}
@SuppressWarnings("unchecked")
public T update(final T t) {
//return getJpaTemplate().merge(t);
T retVal= (T) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws PersistenceException {
T updatedValue = em.merge(t);
return updatedValue;
}
});
return retVal;
}
@SuppressWarnings("unchecked")
public void delete(Class clas, Serializable id) {
getJpaTemplate().remove(get(clas, id));
}
public void delete(T t) {
getJpaTemplate().remove(t);
}
/**
* Find in memory object
*
* @param T
* to be searched object
*/
@SuppressWarnings("unchecked")
public List<T> findByExample(final T exampleObject) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
final ReadAllQuery query = new ReadAllQuery(exampleObject.getClass());
query.useCollectionClass(LinkedList.class);
query.setExampleObject(exampleObject);
EntityManagerImpl emimpl = (EntityManagerImpl) em.getDelegate();
Session session = emimpl.getActiveSession();
List<T> results = (List<T>) session.executeQuery(query);
return results;
}
});
return list;
}
@SuppressWarnings("unchecked")
public List<T> findByExample(final ReadAllQuery query) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
EntityManagerImpl emimpl = (EntityManagerImpl) em.getDelegate();
Session session = emimpl.getActiveSession();
List<T> results = (List<T>) session.executeQuery(query);
return results;
}
});
return list;
}
@SuppressWarnings( { "unchecked", "hiding" })
public <T> List<T> selectAll(final Class<T> clazz, String orderClause) {
Assert.notNull(orderClause);
if (orderClause.contains(",")) {
orderClause = orderClause.replaceAll("\\s", "");
String[] orderbys = orderClause.split(",");
orderClause = "";
for (int i = 0; i < orderbys.length; i++) {
orderClause += "em." + orderbys[i];
if (i < orderbys.length - 1)
orderClause += ", ";
}
} else if (orderClause.trim().length() > 0) {
orderClause = "em." + orderClause;
}
final String ordClause = orderClause;
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws javax.persistence.PersistenceException {
StringBuilder queryStr = new StringBuilder();
queryStr.append("SELECT em FROM ");
queryStr.append(clazz.getSimpleName());
queryStr.append(" em ");
if (ordClause.length() > 0) {
queryStr.append(" em ORDER BY ");
}
logger.debug(queryStr.toString());
final Query query = em.createQuery(queryStr.toString());
return query.getResultList();
}
});
return list;
}
@SuppressWarnings( { "hiding", "unchecked" })
public <T> T findFresh(final Class<T> entityClass, final Object primaryKey)
{
T retVal = (T) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws javax.persistence.PersistenceException {
T result = em.find(entityClass, primaryKey);
if (result == null) {
return null;
}
em.refresh(result);
return result;
}
});
return retVal;
}
// Revisit this method. Do not test it.
// <TODO>
@SuppressWarnings({ "hiding", "unchecked" })
public <T> List<T> getNamedQuery(final Class<T> entityClass, final String
namedQuery,
final Object... binds) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws javax.persistence.PersistenceException {
Query query = em.createNamedQuery(namedQuery);
for (int i = 0; i < binds.length; i++) {
Object temp = binds[i];
query.setParameter(i+1, temp);
}
return query.getResultList();
}
});
return list;
}
@SuppressWarnings({ "hiding", "unchecked" })
public <T> List<T> getNamedQuery(final Class<T> entityClass, final String
namedQuery,
final Map<String,Object> binds) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws PersistenceException {
Query query = em.createNamedQuery(namedQuery);
Set<String> bindKeys = binds.keySet();
for (String key : bindKeys) {
Object val = binds.get(key);
query.setParameter(key, val);
}
return query.getResultList();
}
});
return list;
}
@SuppressWarnings({ "hiding", "unchecked" })
public <T> List<T> getNamedQuery(final Class<T> entityClass, final String
namedQuery,
final Map<String,Object> binds, final Map<String, Object> hints) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(final EntityManager em)
throws PersistenceException {
Query query = em.createNamedQuery(namedQuery);
Set<String> bindKeys = binds.keySet();
for (String key : bindKeys) {
Object val = binds.get(key);
query.setParameter(key, val);
}
Set<String> hintKeys = hints.keySet();
for (String key : hintKeys) {
Object val = hints.get(key);
query.setHint(key, val);
}
return query.getResultList();
}
});
return list;
}
@SuppressWarnings("unchecked")
public T get(Class clas, Serializable id) {
return (T) getJpaTemplate().find(clas, id);
}
@SuppressWarnings({ "hiding", "unchecked" })
public <T> List<T> search(final ReadAllQuery readAllQuery) {
List<T> list = (List<T>) getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
EntityManagerImpl emimpl = (EntityManagerImpl) em.getDelegate();
Session session = emimpl.getActiveSession();
List<T> results = (List<T>) session.executeQuery(readAllQuery);
return results;
}
});
return list;
}
}
Tim Hollosy wrote:
>
> I've noticed on the list some people here - Gaurav Malhotra, etc. had
> a goal of using EclipseLink with Spring. How is this going for
> everyone? I was previously using Eclipselink in an RCP/OSGi
> environment but recently switched over to Spring (Web MVC) and am
> probably going through some of the same growing pains:
>
> Things I'm interested in:
>
> -Your Generic DAO
> -Generic annotation based CRUD controller?
> -DisplayTag's PaginatedList implementation?
>
> Anyone up for some code share here? I started implementing
> PaginatedList but ran into some problems due to the lack of a way to
> programatically set an order by clause via a property name. I have
> some ideas, but would rather not re-invent the wheel...
>
> ./tch
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
>
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