From KDO-openJPA to eclipseLink problem.

Question

1.static weaving,Entity's super class with @MappedSuperclass Annotation does't add the changeTracking in the class,but it can do in openJPA,although the eclipselink's document say it can,but it is't so
sample:
1.1EntityBase class
@MappedSuperclass
public abstract class EntityBase {
private String id;
@Id
@Column(name="ID")
public String getId() {
return id;
     @PrePersist
     private void prePersist() {
          if (getId() == null) {
               setId(generateUUID());
1.2 CodableEntity class
@MappedSuperclass
public abstract class CodableEntity extends EntityBase {
private String code;
@Column(name="CODE")
public String getCode() {
return code;
1.3 SampleEntity class
@Entity
@Table(name="T_Sample")
public class SampleEntity extends CodableEntity {
static weaving,the EntityBase and the CodableEntity hav't the changeTracking code.
I modify the eclipseLink1.0M10 source code.
org.eclipse.persistence.internal.weaving.TransformerFactory
* INTERNAL:
* Store a set of attribute mappings on the given ClassDetails that correspont to the given class.
* Return the list of mappings that is not specifically found on the given class. These attributes will
* be found on MappedSuperclasses.
protected List storeAttributeMappings(Class clz, ClassDetails classDetails, List mappings, boolean weaveValueHolders) {     
List unMappedAttributes = new ArrayList();
Map attributesMap = new HashMap();
Map settersMap = new HashMap();
Map gettersMap = new HashMap();
List lazyMappings = new ArrayList();
for (Iterator iterator = mappings.iterator(); iterator.hasNext();) {
DatabaseMapping mapping = (DatabaseMapping)iterator.next();
String attribute = mapping.getAttributeName();
AttributeDetails attributeDetails = new AttributeDetails(attribute, mapping);
// Initial look for the type of this attribute.
Class typeClass = getAttributeTypeFromClass(clz, attribute, mapping, false);
if (typeClass == null) {
attributeDetails.setAttributeOnSuperClass(true);
// if (mapping.getField() != null || mapping.isForeignReferenceMapping()) {
unMappedAttributes.add(mapping);
right??
2.OpenJPAQuery provider a method,setResultClass,i think it is very good,it can instance the class and fill the DB Result to Object by property/constructor,if it's map,it can put.
Message was edited by:
user646129

Answer 1

thanks your reply.
can eclipselink suport JPA query that select express with alias?
i.e
select o.id,o.name,o.level as manageLevel from xxx where o.id=?1
beacase my dto is a class,I hope the result can map to the class.
I have modied the openJPA1.0.2 and eclipseLink1.0M10 to add the feature,but I think if can support the feature the dto layer is simple.
below is My Modify.
1.JPQL.g
selectClause returns [Object node]
scope{
boolean distinct;
List exprs;
@init {
node = null;
$selectClause::distinct = false;
$selectClause::exprs = new ArrayList();
: t=SELECT (DISTINCT { $selectClause::distinct = true; })?
n = selectItem {$selectClause::exprs.add($n.node); }
( COMMA n = selectItem { $selectClause::exprs.add($n.node); } )*
$node = factory.newSelectClause($t.getLine(), $t.getCharPositionInLine(),
$selectClause::distinct, $selectClause::exprs);
selectItem returns [Object node]
@init { node = null; }
     : n = selectExpression {$node = $n.node;}
          ((AS)? ident = IDENT )?
if ($ident != null){
     $node = factory.newWithAlias($node, $ident.getText());
selectExpression returns [Object node]
@init { node = null; }
: n = pathExprOrVariableAccess {$node = $n.node;}
| n = aggregateExpression {$node = $n.node;}
| n = functionsReturningStrings {$node = $n.node;}
| n = functionsReturningDatetime {$node = $n.node;}
| OBJECT LEFT_ROUND_BRACKET n = variableAccess RIGHT_ROUND_BRACKET {$node = $n.node;}
| n = constructorExpression {$node = $n.node;}
| n = literal {$node = $n.node;}
2.antlr compile the JPQL.g
3.modify the org\eclipse\persistence\internal\jpa\parsing\jpql
3.1 and WithAliasNode interface
public interface WithAliasNode {
     * set the alias
     * @param alias
     public void setAlias(String alias);
     * get the alias
     * @return
     public String getAlias();
3.2 add WithAliasDotNode... class
public class WithAliasDotNode extends DotNode implements WithAliasNode {
     private String alias;
* INTERNAL
* Apply this node to the passed query
public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
if (theQuery.isReportQuery()){
ReportQuery reportQuery = (ReportQuery)theQuery;
reportQuery.addAttribute(alias == null ? resolveAttribute() : alias, generateExpression(context));
reportQuery.dontRetrievePrimaryKeys();
     public String getAlias() {
          return alias;
     public void setAlias(String alias) {
          this.alias = alias;
In openJPA add the feature is very simple,but eclipselink ..,I think that if you can't suport the feature,please give me a extensible chance.