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

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org.hibernate
Interface Criteria

All Superinterfaces:: CriteriaSpecification

All Known Implementing Classes:: CriteriaImpl, CriteriaImpl.Subcriteria

public interface Criteria
extends CriteriaSpecification

Criteria is a simplified API for retrieving entities by composing Criterion objects. This is a very convenient approach for functionality like "search" screens where there is a variable number of conditions to be placed upon the result set.

The Session is a factory for Criteria. Criterion instances are usually obtained via the factory methods on Restrictions. eg.

 List cats = session.createCriteria(Cat.class)
     .add( Restrictions.like("name", "Iz%") )
     .add( Restrictions.gt( "weight", new Float(minWeight) ) )
     .addOrder( Order.asc("age") )
     .list();

You may navigate associations using createAlias() or createCriteria().

 List cats = session.createCriteria(Cat.class)
     .createCriteria("kittens")
         .add( Restrictions.like("name", "Iz%") )
     .list();

 List cats = session.createCriteria(Cat.class)
     .createAlias("kittens", "kit")
     .add( Restrictions.like("kit.name", "Iz%") )
     .list();

You may specify projection and aggregation using Projection instances obtained via the factory methods on Projections.

 List cats = session.createCriteria(Cat.class)
     .setProjection( Projections.projectionList()
         .add( Projections.rowCount() )
         .add( Projections.avg("weight") )
         .add( Projections.max("weight") )
         .add( Projections.min("weight") )
         .add( Projections.groupProperty("color") )
     )
     .addOrder( Order.asc("color") )
     .list();

Author:: Gavin King
See Also:: Session.createCriteria(java.lang.Class), Restrictions, Projections, Order, Criterion, Projection, a disconnected version of this API

Field Summary

Fields inherited from interface org.hibernate.criterion.CriteriaSpecification

ALIAS_TO_ENTITY_MAP, DISTINCT_ROOT_ENTITY, FULL_JOIN, INNER_JOIN, LEFT_JOIN, PROJECTION, ROOT_ALIAS, ROOT_ENTITY

Method Summary

Criteria add(Criterion criterion)
          Add a restriction to constrain the results to be retrieved.

Criteria addOrder(Order order)
          Add an ordering to the result set.

Criteria createAlias(String associationPath, String alias)
          Join an association, assigning an alias to the joined association.

Criteria createAlias(String associationPath, String alias, int joinType)
          Join an association using the specified join-type, assigning an alias to the joined association.

Criteria createCriteria(String associationPath)
          Create a new Criteria, "rooted" at the associated entity.

Criteria createCriteria(String associationPath, int joinType)
          Create a new Criteria, "rooted" at the associated entity, using the specified join type.

Criteria createCriteria(String associationPath, String alias)
          Create a new Criteria, "rooted" at the associated entity, assigning the given alias.

Criteria createCriteria(String associationPath, String alias, int joinType)
          Create a new Criteria, "rooted" at the associated entity, assigning the given alias and using the specified join type.

String getAlias()
          Get the alias of the entity encapsulated by this criteria instance.

List list()
          Get the results.

ScrollableResults scroll()
          Get the results as an instance of ScrollableResults

ScrollableResults scroll(ScrollMode scrollMode)
          Get the results as an instance of ScrollableResults based on the given scroll mode.

Criteria setCacheable(boolean cacheable)
          Enable caching of this query result, provided query caching is enabled for the underlying session factory.

Criteria setCacheMode(CacheMode cacheMode)
          Override the cache mode for this particular query.

Criteria setCacheRegion(String cacheRegion)
          Set the name of the cache region to use for query result caching.

Criteria setComment(String comment)
          Add a comment to the generated SQL.

Criteria setFetchMode(String associationPath, FetchMode mode)
          Specify an association fetching strategy for an association or a collection of values.

Criteria setFetchSize(int fetchSize)
          Set a fetch size for the underlying JDBC query.

Criteria setFirstResult(int firstResult)
          Set the first result to be retrieved.

Criteria setFlushMode(FlushMode flushMode)
          Override the flush mode for this particular query.

Criteria setLockMode(LockMode lockMode)
          Set the lock mode of the current entity

Criteria setLockMode(String alias, LockMode lockMode)
          Set the lock mode of the aliased entity

Criteria setMaxResults(int maxResults)
          Set a limit upon the number of objects to be retrieved.

Criteria setProjection(Projection projection)
          Used to specify that the query results will be a projection (scalar in nature).

Criteria setResultTransformer(ResultTransformer resultTransformer)
          Set a strategy for handling the query results.

Criteria setTimeout(int timeout)
          Set a timeout for the underlying JDBC query.

Object uniqueResult()
          Convenience method to return a single instance that matches the query, or null if the query returns no results.

Method Detail

getAlias

public String getAlias()

Get the alias of the entity encapsulated by this criteria instance.

Returns:: The alias for the encapsulated entity.

setProjection

public Criteria setProjection(Projection projection)

Used to specify that the query results will be a projection (scalar in nature). Implicitly specifies the CriteriaSpecification.PROJECTION result transformer.

The individual components contained within the given projection determines the overall "shape" of the query result.

Parameters:: projection - The projection representing the overall "shape" of the query results.
Returns:: this (for method chaining)

add

public Criteria add(Criterion criterion)

Add a restriction to constrain the results to be retrieved.

Parameters:: criterion - The criterion object representing the restriction to be applied.
Returns:: this (for method chaining)

addOrder

public Criteria addOrder(Order order)

Add an ordering to the result set.

Parameters:: order - The order object representing an ordering to be applied to the results.
Returns:: this (for method chaining)

setFetchMode

public Criteria setFetchMode(String associationPath,
                             FetchMode mode)
                      throws HibernateException

Specify an association fetching strategy for an association or a collection of values.

Parameters:: associationPath - a dot seperated property path; mode - The fetch mode for the referenced association
Returns:: this (for method chaining)
Throws:: HibernateException

setLockMode

public Criteria setLockMode(LockMode lockMode)

Set the lock mode of the current entity

Parameters:: lockMode - The lock mode to be applied
Returns:: this (for method chaining)

setLockMode

public Criteria setLockMode(String alias,
                            LockMode lockMode)

Set the lock mode of the aliased entity

Parameters:: alias - The previously assigned alias representing the entity to which the given lock mode should apply.; lockMode - The lock mode to be applied
Returns:: this (for method chaining)

createAlias

public Criteria createAlias(String associationPath,
                            String alias)
                     throws HibernateException

Join an association, assigning an alias to the joined association.

Functionally equivalent to createAlias(String, String, int) using CriteriaSpecification.INNER_JOIN for the joinType.

Parameters:: associationPath - A dot-seperated property path; alias - The alias to assign to the joined association (for later reference).
Returns:: this (for method chaining)
Throws:: HibernateException

createAlias

public Criteria createAlias(String associationPath,
                            String alias,
                            int joinType)
                     throws HibernateException

Join an association using the specified join-type, assigning an alias to the joined association.

The joinType is expected to be one of CriteriaSpecification.INNER_JOIN (the default), CriteriaSpecification.FULL_JOIN, or CriteriaSpecification.LEFT_JOIN.

Parameters:: associationPath - A dot-seperated property path; alias - The alias to assign to the joined association (for later reference).; joinType - The type of join to use.
Returns:: this (for method chaining)
Throws:: HibernateException

createCriteria

public Criteria createCriteria(String associationPath)
                        throws HibernateException

Create a new Criteria, "rooted" at the associated entity.

Functionally equivalent to createCriteria(String, int) using CriteriaSpecification.INNER_JOIN for the joinType.

Parameters:: associationPath - A dot-seperated property path
Returns:: the created "sub criteria"
Throws:: HibernateException

createCriteria

public Criteria createCriteria(String associationPath,
                               int joinType)
                        throws HibernateException

Create a new Criteria, "rooted" at the associated entity, using the specified join type.

Parameters:: associationPath - A dot-seperated property path; joinType - The type of join to use.
Returns:: the created "sub criteria"
Throws:: HibernateException

createCriteria

public Criteria createCriteria(String associationPath,
                               String alias)
                        throws HibernateException

Create a new Criteria, "rooted" at the associated entity, assigning the given alias.

Functionally equivalent to createCriteria(String, String, int) using CriteriaSpecification.INNER_JOIN for the joinType.

Parameters:: associationPath - A dot-seperated property path; alias - The alias to assign to the joined association (for later reference).
Returns:: the created "sub criteria"
Throws:: HibernateException

createCriteria

public Criteria createCriteria(String associationPath,
                               String alias,
                               int joinType)
                        throws HibernateException

Create a new Criteria, "rooted" at the associated entity, assigning the given alias and using the specified join type.

Parameters:: associationPath - A dot-seperated property path; alias - The alias to assign to the joined association (for later reference).; joinType - The type of join to use.
Returns:: the created "sub criteria"
Throws:: HibernateException

setResultTransformer

public Criteria setResultTransformer(ResultTransformer resultTransformer)

Set a strategy for handling the query results. This determines the "shape" of the query result.

Parameters:: resultTransformer - The transformer to apply
Returns:: this (for method chaining)
See Also:: CriteriaSpecification.ROOT_ENTITY, CriteriaSpecification.DISTINCT_ROOT_ENTITY, CriteriaSpecification.ALIAS_TO_ENTITY_MAP, CriteriaSpecification.PROJECTION

setMaxResults

public Criteria setMaxResults(int maxResults)

Set a limit upon the number of objects to be retrieved.

Parameters:: maxResults - the maximum number of results
Returns:: this (for method chaining)

setFirstResult

public Criteria setFirstResult(int firstResult)

Set the first result to be retrieved.

Parameters:: firstResult - the first result to retrieve, numbered from 0
Returns:: this (for method chaining)

setFetchSize

public Criteria setFetchSize(int fetchSize)

Set a fetch size for the underlying JDBC query.

Parameters:: fetchSize - the fetch size
Returns:: this (for method chaining)
See Also:: Statement.setFetchSize(int)

setTimeout

public Criteria setTimeout(int timeout)

Set a timeout for the underlying JDBC query.

Parameters:: timeout - The timeout value to apply.
Returns:: this (for method chaining)
See Also:: Statement.setQueryTimeout(int)

setCacheable

public Criteria setCacheable(boolean cacheable)

Enable caching of this query result, provided query caching is enabled for the underlying session factory.

Parameters:: cacheable - Should the result be considered cacheable; default is to not cache (false).
Returns:: this (for method chaining)

setCacheRegion

public Criteria setCacheRegion(String cacheRegion)

Set the name of the cache region to use for query result caching.

Parameters:: cacheRegion - the name of a query cache region, or null for the default query cache
Returns:: this (for method chaining)
See Also:: setCacheable(boolean)

setComment

public Criteria setComment(String comment)

Add a comment to the generated SQL.

Parameters:: comment - a human-readable string
Returns:: this (for method chaining)

setFlushMode

public Criteria setFlushMode(FlushMode flushMode)

Override the flush mode for this particular query.

Parameters:: flushMode - The flush mode to use.
Returns:: this (for method chaining)

setCacheMode

public Criteria setCacheMode(CacheMode cacheMode)

Override the cache mode for this particular query.

Parameters:: cacheMode - The cache mode to use.
Returns:: this (for method chaining)

list

public List list()
          throws HibernateException

Get the results.

Returns:: The list of matched query results.
Throws:: HibernateException

scroll

public ScrollableResults scroll()
                         throws HibernateException

Get the results as an instance of ScrollableResults

Returns:: The ScrollableResults representing the matched query results.
Throws:: HibernateException

scroll

public ScrollableResults scroll(ScrollMode scrollMode)
                         throws HibernateException

Get the results as an instance of ScrollableResults based on the given scroll mode.

Parameters:: scrollMode - Indicates the type of underlying database cursor to request.
Returns:: The ScrollableResults representing the matched query results.
Throws:: HibernateException

uniqueResult

public Object uniqueResult()
                    throws HibernateException

Convenience method to return a single instance that matches the query, or null if the query returns no results.

Returns:: the single result or null
Throws:: HibernateException - if there is more than one matching result

Overview

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Class

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Tree

Deprecated

Index

Help

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

Method Summary
`Criteria`	`add(Criterion criterion)` Add a `restriction` to constrain the results to be retrieved.
`Criteria`	`addOrder(Order order)` Add an `ordering` to the result set.
`Criteria`	`createAlias(String associationPath, String alias)` Join an association, assigning an alias to the joined association.
`Criteria`	`createAlias(String associationPath, String alias, int joinType)` Join an association using the specified join-type, assigning an alias to the joined association.
`Criteria`	`createCriteria(String associationPath)` Create a new `Criteria`, "rooted" at the associated entity.
`Criteria`	`createCriteria(String associationPath, int joinType)` Create a new `Criteria`, "rooted" at the associated entity, using the specified join type.
`Criteria`	`createCriteria(String associationPath, String alias)` Create a new `Criteria`, "rooted" at the associated entity, assigning the given alias.
`Criteria`	`createCriteria(String associationPath, String alias, int joinType)` Create a new `Criteria`, "rooted" at the associated entity, assigning the given alias and using the specified join type.
`String`	`getAlias()` Get the alias of the entity encapsulated by this criteria instance.
`List`	`list()` Get the results.
`ScrollableResults`	`scroll()` Get the results as an instance of `ScrollableResults`
`ScrollableResults`	`scroll(ScrollMode scrollMode)` Get the results as an instance of `ScrollableResults` based on the given scroll mode.
`Criteria`	`setCacheable(boolean cacheable)` Enable caching of this query result, provided query caching is enabled for the underlying session factory.
`Criteria`	`setCacheMode(CacheMode cacheMode)` Override the cache mode for this particular query.
`Criteria`	`setCacheRegion(String cacheRegion)` Set the name of the cache region to use for query result caching.
`Criteria`	`setComment(String comment)` Add a comment to the generated SQL.
`Criteria`	`setFetchMode(String associationPath, FetchMode mode)` Specify an association fetching strategy for an association or a collection of values.
`Criteria`	`setFetchSize(int fetchSize)` Set a fetch size for the underlying JDBC query.
`Criteria`	`setFirstResult(int firstResult)` Set the first result to be retrieved.
`Criteria`	`setFlushMode(FlushMode flushMode)` Override the flush mode for this particular query.
`Criteria`	`setLockMode(LockMode lockMode)` Set the lock mode of the current entity
`Criteria`	`setLockMode(String alias, LockMode lockMode)` Set the lock mode of the aliased entity
`Criteria`	`setMaxResults(int maxResults)` Set a limit upon the number of objects to be retrieved.
`Criteria`	`setProjection(Projection projection)` Used to specify that the query results will be a projection (scalar in nature).
`Criteria`	`setResultTransformer(ResultTransformer resultTransformer)` Set a strategy for handling the query results.
`Criteria`	`setTimeout(int timeout)` Set a timeout for the underlying JDBC query.
`Object`	`uniqueResult()` Convenience method to return a single instance that matches the query, or null if the query returns no results.

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

org.hibernate Interface Criteria

getAlias

setProjection

add

addOrder

setFetchMode

setLockMode

setLockMode

createAlias

createAlias

createCriteria

createCriteria

createCriteria

createCriteria

setResultTransformer

setMaxResults

setFirstResult

setFetchSize

setTimeout

setCacheable

setCacheRegion

setComment

setFlushMode

setCacheMode

list

scroll

scroll

uniqueResult

org.hibernate
Interface Criteria