org.apache.cayenne.query

Class PrefetchSelectQuery<T>

java.lang.Object

org.apache.cayenne.query.CacheableQuery

org.apache.cayenne.query.AbstractQuery

org.apache.cayenne.query.SelectQuery<T>

org.apache.cayenne.query.PrefetchSelectQuery<T>

All Implemented Interfaces:

Serializable, ParameterizedQuery, Query, Select<T>

public class PrefetchSelectQuery<T>
extends SelectQuery<T>

A SelectQuery to perform a prefetch based on another query. Used internally by Cayenne and is normally never used directly.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected ObjRelationship	lastPrefetchHint Stores the last ObjRelationship in the prefetch path.
protected String	prefetchPath The relationship path from root objects to the objects being prefetched.
protected Collection<String>	resultPaths

Fields inherited from class org.apache.cayenne.query.SelectQuery

canReturnScalarValue, columns, distinct, DISTINCT_DEFAULT, DISTINCT_PROPERTY, havingQualifier, orderings, qualifier

Fields inherited from class org.apache.cayenne.query.AbstractQuery

root

Fields inherited from class org.apache.cayenne.query.CacheableQuery

logger

Constructor Summary

Constructors

Constructor and Description
PrefetchSelectQuery(String prefetchPath, ObjRelationship lastPrefetchHint) Creates a new disjoint prefetch select query.

Method Summary

Modifier and Type	Method and Description
void	addResultPath(String path) Configures an "extra" path that will resolve to an extra column (or columns) in the result set.
ObjRelationship	getLastPrefetchHint() Returns last incoming ObjRelationship in the prefetch relationship chain.
String	getPrefetchPath() Returns the prefetchPath.
Collection<String>	getResultPaths() Returns extra result paths.
void	removeResultPath(String path) Removes an extra result path.
void	setLastPrefetchHint(ObjRelationship relationship)
void	setPrefetchPath(String prefetchPath) Sets the prefetchPath.

Methods inherited from class org.apache.cayenne.query.SelectQuery

addOrdering, addOrdering, addOrderings, addPrefetch, addPrefetch, aliasPathSplits, andHavingQualifier, andQualifier, batchIterator, canReturnScalarValue, clearOrderings, clearPrefetches, createQuery, createSQLAction, dataRowQuery, dataRowQuery, dataRowQuery, getBaseMetaData, getColumns, getFetchLimit, getFetchOffset, getHavingQualifier, getMetaData, getOrderings, getPageSize, getPrefetchTree, getQualifier, getStatementFetchSize, initWithProperties, isDistinct, isFetchingDataRows, iterate, iterator, orHavingQualifier, orQualifier, query, query, query, queryWithParameters, queryWithParameters, removeOrdering, removePrefetch, route, select, selectFirst, selectOne, setCanReturnScalarValue, setColumns, setColumns, setDistinct, setFetchingDataRows, setFetchLimit, setFetchOffset, setHavingQualifier, setPageSize, setPrefetchTree, setQualifier, setStatementFetchSize, setSuppressDistinct

Methods inherited from class org.apache.cayenne.query.AbstractQuery

getRoot, setRoot, toString

Methods inherited from class org.apache.cayenne.query.CacheableQuery

getCacheGroup, getCacheStrategy, setCacheGroup, setCacheStrategy, useLocalCache, useLocalCache, useSharedCache, useSharedCache

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

prefetchPath

protected String prefetchPath

The relationship path from root objects to the objects being prefetched.

lastPrefetchHint

protected ObjRelationship lastPrefetchHint

Stores the last ObjRelationship in the prefetch path.

resultPaths

protected Collection<String> resultPaths

Constructor Detail

PrefetchSelectQuery

public PrefetchSelectQuery(String prefetchPath,
                           ObjRelationship lastPrefetchHint)

Creates a new disjoint prefetch select query.

Since:

3.1

Method Detail

getPrefetchPath

public String getPrefetchPath()

Returns the prefetchPath.

setPrefetchPath

public void setPrefetchPath(String prefetchPath)

Sets the prefetchPath.

Parameters:

prefetchPath - The prefetchPath to set

getLastPrefetchHint

public ObjRelationship getLastPrefetchHint()

Returns last incoming ObjRelationship in the prefetch relationship chain.

Since:

1.1

setLastPrefetchHint

public void setLastPrefetchHint(ObjRelationship relationship)

Since:

1.1

addResultPath

public void addResultPath(String path)

Configures an "extra" path that will resolve to an extra column (or columns) in the result set.

Parameters:

path - A valid path expression. E.g. "abc" or "db:ABC" or "abc.xyz".

Since:

1.2

removeResultPath

public void removeResultPath(String path)

Removes an extra result path. Note that this method doesn't check for expression invariants, as it doesn't have a proper context to do so. E.g. for the purpose of this method "db:ARTIST_NAME" and "obj:artistName" are not the same, though both will resolve to the same column name.

getResultPaths

public Collection<String> getResultPaths()

Returns extra result paths.

Since:

1.2