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QueryLoader (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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org.hibernate.loader.hql
Class QueryLoader

java.lang.Object
  org.hibernate.loader.Loader
      org.hibernate.loader.BasicLoader
          org.hibernate.loader.hql.QueryLoader

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public class QueryLoader

extends BasicLoader

A delegate that implements the Loader part of QueryTranslator.

Author:

josh

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Field Summary

 

Fields inherited from class org.hibernate.loader.BasicLoader

NO_SUFFIX

 

Constructor Summary

QueryLoader(QueryTranslatorImpl queryTranslator, SessionFactoryImplementor factory, SelectClause selectClause)           Creates a new Loader implementation.

 

Method Summary
protected  String	applyLocks(String sql, Map lockModes, Dialect dialect)           Append FOR UPDATE OF clause, if necessary.
protected  int	bindParameterValues(PreparedStatement statement, QueryParameters queryParameters, int startIndex, SessionImplementor session)           We specifically override this method here, because in general we know much more about the parameters and their appropriate bind positions here then we do in our super because we track them explciitly here through the ParameterSpecification interface.
String[]	getAliases()           Get the SQL table aliases of entities whose associations are subselect-loadable, returning null if this loader does not support subselect loading
protected  int[]	getCollectionOwners()           Get the index of the entity that owns the collection, or -1 if there is no owner in the query results (ie.
protected  CollectionPersister[]	getCollectionPersisters()           An (optional) persister for a collection to be initialized; only collection loaders return a non-null value
String[]	getCollectionSuffixes()
protected  boolean[]	getEntityEagerPropertyFetches()           An array indicating whether the entities have eager property fetching enabled.
Loadable[]	getEntityPersisters()           An array of persisters of entity classes contained in each row of results; implemented by all subclasses
protected  LockMode[]	getLockModes(Map lockModes)           What lock mode does this load entities with?
int[]	getNamedParameterLocs(String name)           Returns the locations of all occurrences of the named parameter.
protected  EntityType[]	getOwnerAssociationTypes()           An array of the owner types corresponding to the getOwners() returns.
protected  int[]	getOwners()           An array of indexes of the entity that owns a one-to-one association to the entity at the given index (-1 if there is no "owner")
protected  String	getQueryIdentifier()           Identifies the query for statistics reporting, if null, no statistics will be reported
protected  Object	getResultColumnOrRow(Object[] row, ResultTransformer transformer, ResultSet rs, SessionImplementor session)           Get the actual object that is returned in the user-visible result list.
protected  List	getResultList(List results, ResultTransformer resultTransformer)
String[]	getSqlAliasSuffixes()
protected  String	getSQLString()           The SQL query string to be called.
String[]	getSuffixes()
protected  boolean	isSubselectLoadingEnabled()
Iterator	iterate(QueryParameters queryParameters, EventSource session)
List	list(SessionImplementor session, QueryParameters queryParameters)
protected  boolean	needsFetchingScroll()           Does the result set to be scrolled contain collection fetches?
ScrollableResults	scroll(QueryParameters queryParameters, SessionImplementor session)
protected  boolean	upgradeLocks()           Does this query return objects that might be already cached by the session, whose lock mode may need upgrading
void	validateScrollability()

 

Methods inherited from class org.hibernate.loader.BasicLoader

generateSuffixes, generateSuffixes, getCollectionAliases, getEntityAliases, postInstantiate

 

Methods inherited from class org.hibernate.loader.Loader

autoDiscoverTypes, bindNamedParameters, bindPositionalParameters, checkScrollability, doList, getFactory, getResultSet, hasSubselectLoadableCollections, isSingleRowLoader, list, loadCollection, loadCollectionBatch, loadCollectionSubselect, loadEntity, loadEntity, loadEntityBatch, loadSequentialRowsForward, loadSequentialRowsReverse, loadSingleRow, prepareQueryStatement, preprocessSQL, processFilters, scroll, toString

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

QueryLoader

public QueryLoader(QueryTranslatorImpl queryTranslator,
                   SessionFactoryImplementor factory,
                   SelectClause selectClause)

Creates a new Loader implementation.

Parameters:

queryTranslator - The query translator that is the delegator.

factory - The factory from which this loader is being created.

selectClause - The AST representing the select clause for loading.

Method Detail

validateScrollability

public final void validateScrollability()
                                 throws HibernateException

Throws:

HibernateException

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needsFetchingScroll

protected boolean needsFetchingScroll()

Description copied from class: Loader

Does the result set to be scrolled contain collection fetches?

Overrides:

needsFetchingScroll in class Loader

Returns:

True if it does, and thus needs the special fetching scroll functionality; false otherwise.

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getEntityPersisters

public Loadable[] getEntityPersisters()

Description copied from class: Loader

An array of persisters of entity classes contained in each row of results; implemented by all subclasses

Specified by:

getEntityPersisters in class Loader

Returns:

The entity persisters.

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getAliases

public String[] getAliases()

Description copied from class: Loader

Get the SQL table aliases of entities whose associations are subselect-loadable, returning null if this loader does not support subselect loading

Overrides:

getAliases in class Loader

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getSqlAliasSuffixes

public String[] getSqlAliasSuffixes()

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getSuffixes

public String[] getSuffixes()

Specified by:

getSuffixes in class BasicLoader

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getCollectionSuffixes

public String[] getCollectionSuffixes()

Specified by:

getCollectionSuffixes in class BasicLoader

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getQueryIdentifier

protected String getQueryIdentifier()

Description copied from class: Loader

Identifies the query for statistics reporting, if null, no statistics will be reported

Overrides:

getQueryIdentifier in class Loader

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getSQLString

protected String getSQLString()

The SQL query string to be called.

Specified by:

getSQLString in class Loader

Returns:

The sql command this loader should use to get its ResultSet.

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getCollectionPersisters

protected CollectionPersister[] getCollectionPersisters()

An (optional) persister for a collection to be initialized; only collection loaders return a non-null value

Overrides:

getCollectionPersisters in class Loader

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getCollectionOwners

protected int[] getCollectionOwners()

Description copied from class: Loader

Get the index of the entity that owns the collection, or -1 if there is no owner in the query results (ie. in the case of a collection initializer) or no collection.

Overrides:

getCollectionOwners in class Loader

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getEntityEagerPropertyFetches

protected boolean[] getEntityEagerPropertyFetches()

Description copied from class: Loader

An array indicating whether the entities have eager property fetching enabled.

Overrides:

getEntityEagerPropertyFetches in class Loader

Returns:

Eager property fetching indicators.

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getOwners

protected int[] getOwners()

An array of indexes of the entity that owns a one-to-one association to the entity at the given index (-1 if there is no "owner")

Overrides:

getOwners in class Loader

Returns:

The owner indicators (see discussion above).

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getOwnerAssociationTypes

protected EntityType[] getOwnerAssociationTypes()

Description copied from class: Loader

An array of the owner types corresponding to the Loader.getOwners() returns. Indices indicating no owner would be null here.

Overrides:

getOwnerAssociationTypes in class Loader

Returns:

The types for the owners.

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isSubselectLoadingEnabled

protected boolean isSubselectLoadingEnabled()

Overrides:

isSubselectLoadingEnabled in class Loader

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getLockModes

protected LockMode[] getLockModes(Map lockModes)

Description copied from class: Loader

What lock mode does this load entities with?

Specified by:

getLockModes in class Loader

Parameters:

lockModes - a collection of lock modes specified dynamically via the Query interface

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applyLocks

protected String applyLocks(String sql,
                            Map lockModes,
                            Dialect dialect)
                     throws QueryException

Description copied from class: Loader

Append FOR UPDATE OF clause, if necessary. This empty superclass implementation merely returns its first argument.

Overrides:

applyLocks in class Loader

Throws:

QueryException

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upgradeLocks

protected boolean upgradeLocks()

Description copied from class: Loader

Does this query return objects that might be already cached by the session, whose lock mode may need upgrading

Overrides:

upgradeLocks in class Loader

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getResultColumnOrRow

protected Object getResultColumnOrRow(Object[] row,
                                      ResultTransformer transformer,
                                      ResultSet rs,
                                      SessionImplementor session)
                               throws SQLException,
                                      HibernateException

Description copied from class: Loader

Get the actual object that is returned in the user-visible result list. This empty implementation merely returns its first argument. This is overridden by some subclasses.

Overrides:

getResultColumnOrRow in class Loader

Throws:

SQLException

HibernateException

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getResultList

protected List getResultList(List results,
                             ResultTransformer resultTransformer)
                      throws QueryException

Overrides:

getResultList in class Loader

Throws:

QueryException

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list

public List list(SessionImplementor session,
                 QueryParameters queryParameters)
          throws HibernateException

Throws:

HibernateException

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iterate

public Iterator iterate(QueryParameters queryParameters,
                        EventSource session)
                 throws HibernateException

Throws:

HibernateException

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scroll

public ScrollableResults scroll(QueryParameters queryParameters,
                                SessionImplementor session)
                         throws HibernateException

Throws:

HibernateException

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getNamedParameterLocs

public int[] getNamedParameterLocs(String name)
                            throws QueryException

Returns the locations of all occurrences of the named parameter.

Overrides:

getNamedParameterLocs in class Loader

Throws:

QueryException

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bindParameterValues

protected int bindParameterValues(PreparedStatement statement,
                                  QueryParameters queryParameters,
                                  int startIndex,
                                  SessionImplementor session)
                           throws SQLException

We specifically override this method here, because in general we know much more about the parameters and their appropriate bind positions here then we do in our super because we track them explciitly here through the ParameterSpecification interface.

Overrides:

bindParameterValues in class Loader

Parameters:

queryParameters - The encapsulation of the parameter values to be bound.

startIndex - The position from which to start binding parameter values.

session - The originating session.

statement - The JDBC prepared statement

Returns:

The number of JDBC bind positions actually bound during this method execution.

Throws:

SQLException - Indicates problems performing the binding.

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