[Hibernate-JIRA] Created: (HHH-2774) Call ResultTransformer.transformList() even if the list argument is an empty list
4:29 a.m.
Call ResultTransformer.transformList() even if the list argument is an empty list
---------------------------------------------------------------------------------
Key: HHH-2774
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
Project: Hibernate3
Issue Type: Improvement
Components: core
Reporter: Christian Bauer
Priority: Trivial
I have a case where a ResultTransformer is doing all the work in transformTuple() and
always returns null from that method. The transformed target state is held internally in
the ResultTransformer instance (I basically turn many tuples into one). Now I can't
get this state out of the ResultTransformer because transformList() is not called after
transformTuple().
It would be better if transformList() is called even if the list of tuples returned by
transformTuple() is empty.
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5:37 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2774) Call ResultTransformer.transformList() even if the list argument is an empty list
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774?page=c...
]
Max Rydahl Andersen commented on HHH-2774:
------------------------------------------
as far as i remember the processing is optimized this way....and what is the usecase that
generates data when the query returns 0 elements ?
Call ResultTransformer.transformList() even if the list argument is
an empty list
---------------------------------------------------------------------------------
Key: HHH-2774
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
Project: Hibernate3
Issue Type: Improvement
Components: core
Reporter: Christian Bauer
Priority: Trivial
I have a case where a ResultTransformer is doing all the work in transformTuple() and
always returns null from that method. The transformed target state is held internally in
the ResultTransformer instance (I basically turn many tuples into one). Now I can't
get this state out of the ResultTransformer because transformList() is not called after
transformTuple().
It would be better if transformList() is called even if the list of tuples returned by
transformTuple() is empty.
--
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6:02 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2774) Call ResultTransformer.transformList() even if the list argument is an empty list
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774?page=c...
]
Christian Bauer commented on HHH-2774:
--------------------------------------
Short story: I convert a flat tree (a bunch of arrays/tuples) into a tree representation
with object references.
Call ResultTransformer.transformList() even if the list argument is
an empty list
---------------------------------------------------------------------------------
Key: HHH-2774
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
Project: Hibernate3
Issue Type: Improvement
Components: core
Reporter: Christian Bauer
Priority: Trivial
I have a case where a ResultTransformer is doing all the work in transformTuple() and
always returns null from that method. The transformed target state is held internally in
the ResultTransformer instance (I basically turn many tuples into one). Now I can't
get this state out of the ResultTransformer because transformList() is not called after
transformTuple().
It would be better if transformList() is called even if the list of tuples returned by
transformTuple() is empty.
--
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-
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6:02 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2774) Call ResultTransformer.transformList() even if the list argument is an empty list
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774?page=c...
]
Christian Bauer commented on HHH-2774:
--------------------------------------
Have fun:
public <N extends NestedSetNode> NestedSetNodeWrapper<N>
findNestedSetNodes(N startNode, Comparator<NestedSetNodeWrapper<N>>
comparator) {
StringBuffer queryString = new StringBuffer();
queryString.append("select").append(" ");
queryString.append("count(n1.id) as nestedSetNodeLevel").append(",
");
queryString.append("n1 as nestedSetNode").append(" ");
queryString.append("from
").append(startNode.getTreeSuperclassEntityName()).append(" n1, ");
queryString.append(startNode.getTreeSuperclassEntityName()).append(" n2
");
queryString.append("where n1.nsThread = :thread and n2.nsThread =
:thread").append(" ");
queryString.append("and n1.nsLeft between n2.nsLeft and
n2.nsRight").append(" ");
queryString.append("and n2.nsLeft > :startLeft and n2.nsRight <
:startRight").append(" ");
queryString.append("and n1.menuItem = true").append(" ");
queryString.append("group by").append(" ");
for (int i = 0; i < startNode.getTreeSuperclassPropertiesForGrouping().length;
i++) {
queryString.append("n1.").append(startNode.getTreeSuperclassPropertiesForGrouping()[i]);
if (i != startNode.getTreeSuperclassPropertiesForGrouping().length-1)
queryString.append(", ");
}
queryString.append(" ");
queryString.append("order by n1.nsLeft");
Query nestedSetQuery = getSession().createQuery(queryString.toString());
nestedSetQuery.setParameter("thread", startNode.getNsThread());
nestedSetQuery.setParameter("startLeft", startNode.getNsLeft());
nestedSetQuery.setParameter("startRight", startNode.getNsRight());
NestedSetNodeWrapper<N> startNodeWrapper = new
NestedSetNodeWrapper<N>(startNode, comparator, 0l);
nestedSetQuery.setResultTransformer( new
NestedSetResultTransformer<N>(startNodeWrapper) );
return (NestedSetNodeWrapper<N>)nestedSetQuery.list().get(0);
}
public class NestedSetResultTransformer<N extends NestedSetNode> implements
ResultTransformer {
NestedSetNodeWrapper<N> rootWrapper;
NestedSetNodeWrapper<N> currentParent;
public NestedSetResultTransformer(NestedSetNodeWrapper<N> rootWrapper) {
this.rootWrapper = rootWrapper;
currentParent = rootWrapper;
}
public Object transformTuple(Object[] objects, String[] aliases) {
if (!"nestedSetNodeLevel".equals(aliases[0]))
throw new RuntimeException("Missing alias
'nestedSetNodeLevel' as the first projected value in the nested set query");
if (!"nestedSetNode".equals(aliases[1]))
throw new RuntimeException("Missing alias 'nestedSetNode' as
the second projected value in the nested set query");
if (objects.length != 2) {
throw new RuntimeException("Nested set query needs to return two
values, the level and the nested set node");
}
Long nestedSetNodeLevel = (Long)objects[0];
N nestedSetNode = (N)objects[1];
NestedSetNodeWrapper<N> newNodeWrapper = new
NestedSetNodeWrapper<N>(nestedSetNode, currentParent.getComparator(),
nestedSetNodeLevel);
System.out.println("### TYRING TO PLACE: " + newNodeWrapper);
if
(!newNodeWrapper.getWrappedNode().getParent().getId().equals(currentParent.getWrappedNode().getId()))
{
NestedSetNodeWrapper<N> foundParent =
findParentInTree(newNodeWrapper.getWrappedNode().getParent().getId(), currentParent);
if (foundParent != null) {
currentParent = foundParent;
} else {
return null; // Continue
}
}
System.out.println("### PLACING: " + newNodeWrapper + " UNDER
PARENT: " + currentParent);
newNodeWrapper.setParent(currentParent);
currentParent.getChildren().add(newNodeWrapper);
currentParent = newNodeWrapper;
// TODO: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
return rootWrapper;
}
private NestedSetNodeWrapper<N> findParentInTree(Long parentId,
NestedSetNodeWrapper<N> startNode) {
if (!parentId.equals(startNode.getWrappedNode().getId()) &&
startNode.getParent() != null) {
return findParentInTree(parentId, startNode.getParent());
} else if (parentId.equals(startNode.getWrappedNode().getId())) {
return startNode;
} else {
return null;
}
}
public List transformList(List list) {
// TODO: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
list.clear();
list.add(rootWrapper);
return list;
}
}
Call ResultTransformer.transformList() even if the list argument is
an empty list
---------------------------------------------------------------------------------
Key: HHH-2774
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
Project: Hibernate3
Issue Type: Improvement
Components: core
Reporter: Christian Bauer
Priority: Trivial
I have a case where a ResultTransformer is doing all the work in transformTuple() and
always returns null from that method. The transformed target state is held internally in
the ResultTransformer instance (I basically turn many tuples into one). Now I can't
get this state out of the ResultTransformer because transformList() is not called after
transformTuple().
It would be better if transformList() is called even if the list of tuples returned by
transformTuple() is empty.
--
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7:33 a.m.
New subject: [Hibernate-JIRA] Commented: (HHH-2774) Call ResultTransformer.transformList() even if the list argument is an empty list
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774?page=c...
]
Nikhil Ruikar commented on HHH-2774:
------------------------------------
Hi I also came across same problem. Can you please provide me such other characters which
can not be used in hibernate SQL query
Call ResultTransformer.transformList() even if the list argument is
an empty list
---------------------------------------------------------------------------------
Key: HHH-2774
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2774
Project: Hibernate Core
Issue Type: Improvement
Components: core
Reporter: Christian Bauer
Priority: Trivial
I have a case where a ResultTransformer is doing all the work in transformTuple() and
always returns null from that method. The transformed target state is held internally in
the ResultTransformer instance (I basically turn many tuples into one). Now I can't
get this state out of the ResultTransformer because transformList() is not called after
transformTuple().
It would be better if transformList() is called even if the list of tuples returned by
transformTuple() is empty.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
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4 comments
3 participants
participants (3)
-
Christian Bauer (JIRA) -
Max Rydahl Andersen (JIRA)
-
Nikhil Ruikar (JIRA)