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QueryTranslatorImpl (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.hql.ast
Class QueryTranslatorImpl

java.lang.Object
  org.hibernate.hql.ast.QueryTranslatorImpl

All Implemented Interfaces:

FilterTranslator, QueryTranslator

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public class QueryTranslatorImpl

extends Object

implements FilterTranslator

A QueryTranslator that uses an Antlr-based parser.

Author:

Joshua Davis (pgmjsd@sourceforge.net)

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Nested Class Summary
static class	QueryTranslatorImpl.JavaConstantConverter

 

Field Summary

 

Fields inherited from interface org.hibernate.hql.QueryTranslator

ERROR_CANNOT_DETERMINE_TYPE, ERROR_CANNOT_FETCH_WITH_ITERATE, ERROR_CANNOT_FORMAT_LITERAL, ERROR_NAMED_PARAMETER_DOES_NOT_APPEAR

 

Constructor Summary

QueryTranslatorImpl(String queryIdentifier, String query, Map enabledFilters, SessionFactoryImplementor factory)           Creates a new AST-based query translator.

 

Method Summary
List	collectSqlStrings()
void	compile(Map replacements, boolean shallow)           Compile a "normal" query.
void	compile(String collectionRole, Map replacements, boolean shallow)           Compile a filter.
boolean	containsCollectionFetches()           Does the translated query contain collection fetches?
int	executeUpdate(QueryParameters queryParameters, SessionImplementor session)           Perform a bulk update/delete operation given the underlying query defintion.
String[][]	getColumnNames()           Returns the column names in the generated SQL.
Map	getEnabledFilters()           Returns the filters enabled for this query translator.
int[]	getNamedParameterLocs(String name)
ParameterTranslations	getParameterTranslations()           Return information about any parameters encountered during translation.
String	getQueryIdentifier()           Retrieve the query identifier for this translator.
Set	getQuerySpaces()           Returns the set of query spaces (table names) that the query referrs to.
String	getQueryString()           Returns the HQL string processed by the translator.
String[]	getReturnAliases()           Returns an array of HQL aliases
Type[]	getReturnTypes()           Types of the return values of an iterate() style query.
Statement	getSqlAST()
String	getSQLString()           The SQL query string to be called; implemented by all subclasses
boolean	isManipulationStatement()
boolean	isShallowQuery()
Iterator	iterate(QueryParameters queryParameters, EventSource session)           Return the query results as an iterator
List	list(SessionImplementor session, QueryParameters queryParameters)           Perform a list operation given the underlying query definition.
ScrollableResults	scroll(QueryParameters queryParameters, SessionImplementor session)           Return the query results, as an instance of ScrollableResults
void	validateScrollability()           Validate the scrollability of the translated query.

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

QueryTranslatorImpl

public QueryTranslatorImpl(String queryIdentifier,
                           String query,
                           Map enabledFilters,
                           SessionFactoryImplementor factory)

Creates a new AST-based query translator.

Parameters:

queryIdentifier - The query-identifier (used in stats collection)

query - The hql query to translate

enabledFilters - Currently enabled filters

factory - The session factory constructing this translator instance.

Method Detail

compile

public void compile(Map replacements,
                    boolean shallow)
             throws QueryException,
                    MappingException

Compile a "normal" query. This method may be called multiple times. Subsequent invocations are no-ops.

Specified by:

compile in interface QueryTranslator

Parameters:

replacements - Defined query substitutions.

shallow - Does this represent a shallow (scalar or entity-id) select?

Throws:

QueryException - There was a problem parsing the query string.

MappingException - There was a problem querying defined mappings.

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compile

public void compile(String collectionRole,
                    Map replacements,
                    boolean shallow)
             throws QueryException,
                    MappingException

Compile a filter. This method may be called multiple times. Subsequent invocations are no-ops.

Specified by:

compile in interface FilterTranslator

Parameters:

collectionRole - the role name of the collection used as the basis for the filter.

replacements - Defined query substitutions.

shallow - Does this represent a shallow (scalar or entity-id) select?

Throws:

QueryException - There was a problem parsing the query string.

MappingException - There was a problem querying defined mappings.

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getQueryIdentifier

public String getQueryIdentifier()

Description copied from interface: QueryTranslator

Retrieve the query identifier for this translator. The query identifier is used in stats collection.

Specified by:

getQueryIdentifier in interface QueryTranslator

Returns:

the identifier

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getSqlAST

public Statement getSqlAST()

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getReturnTypes

public Type[] getReturnTypes()

Types of the return values of an iterate() style query.

Specified by:

getReturnTypes in interface QueryTranslator

Returns:

an array of Types.

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getReturnAliases

public String[] getReturnAliases()

Description copied from interface: QueryTranslator

Returns an array of HQL aliases

Specified by:

getReturnAliases in interface QueryTranslator

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getColumnNames

public String[][] getColumnNames()

Description copied from interface: QueryTranslator

Returns the column names in the generated SQL.

Specified by:

getColumnNames in interface QueryTranslator

Returns:

the column names in the generated SQL.

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getQuerySpaces

public Set getQuerySpaces()

Description copied from interface: QueryTranslator

Returns the set of query spaces (table names) that the query referrs to.

Specified by:

getQuerySpaces in interface QueryTranslator

Returns:

A set of query spaces (table names).

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list

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

Description copied from interface: QueryTranslator

Perform a list operation given the underlying query definition.

Specified by:

list in interface QueryTranslator

Parameters:

session - The session owning this query.

queryParameters - The query bind parameters.

Returns:

The query list results.

Throws:

HibernateException

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iterate

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

Return the query results as an iterator

Specified by:

iterate in interface QueryTranslator

Parameters:

queryParameters - The query bind parameters.

session - The session owning this query.

Returns:

An iterator over the query results.

Throws:

HibernateException

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scroll

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

Return the query results, as an instance of ScrollableResults

Specified by:

scroll in interface QueryTranslator

Parameters:

queryParameters - The query bind parameters.

session - The session owning this query.

Returns:

The ScrollableResults wrapper around the query results.

Throws:

HibernateException

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executeUpdate

public int executeUpdate(QueryParameters queryParameters,
                         SessionImplementor session)
                  throws HibernateException

Description copied from interface: QueryTranslator

Perform a bulk update/delete operation given the underlying query defintion.

Specified by:

executeUpdate in interface QueryTranslator

Parameters:

queryParameters - The query bind parameters.

session - The session owning this query.

Returns:

The number of entities updated or deleted.

Throws:

HibernateException

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getSQLString

public String getSQLString()

The SQL query string to be called; implemented by all subclasses

Specified by:

getSQLString in interface QueryTranslator

Returns:

the SQL string generated by the translator.

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collectSqlStrings

public List collectSqlStrings()

Specified by:

collectSqlStrings in interface QueryTranslator

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isShallowQuery

public boolean isShallowQuery()

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getQueryString

public String getQueryString()

Description copied from interface: QueryTranslator

Returns the HQL string processed by the translator.

Specified by:

getQueryString in interface QueryTranslator

Returns:

the HQL string processed by the translator.

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getEnabledFilters

public Map getEnabledFilters()

Description copied from interface: QueryTranslator

Returns the filters enabled for this query translator.

Specified by:

getEnabledFilters in interface QueryTranslator

Returns:

Filters enabled for this query execution.

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getNamedParameterLocs

public int[] getNamedParameterLocs(String name)

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containsCollectionFetches

public boolean containsCollectionFetches()

Description copied from interface: QueryTranslator

Does the translated query contain collection fetches?

Specified by:

containsCollectionFetches in interface QueryTranslator

Returns:

tru if the query does contain collection fetched; false otherwise.

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isManipulationStatement

public boolean isManipulationStatement()

Specified by:

isManipulationStatement in interface QueryTranslator

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validateScrollability

public void validateScrollability()
                           throws HibernateException

Description copied from interface: QueryTranslator

Validate the scrollability of the translated query.

Specified by:

validateScrollability in interface QueryTranslator

Throws:

HibernateException

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getParameterTranslations

public ParameterTranslations getParameterTranslations()

Description copied from interface: QueryTranslator

Return information about any parameters encountered during translation.

Specified by:

getParameterTranslations in interface QueryTranslator

Returns:

The parameter information.

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