org.apache.openjpa.persistence.query

Interface DomainObject

All Superinterfaces:

Expression, OrderByItem, PathExpression, PredicateOperand, QueryDefinition, SelectItem, Subquery

All Known Implementing Classes:

AbstractDomainObject, EntryExpression, FetchPath, JoinPath, KeyExpression, OperatorPath, RootPath, ValueExpression

public interface DomainObject
extends PathExpression, QueryDefinition

Domain objects define the domain over which a query operates. A domain object plays a role analogous to that of a Java Persistence query language identification variable.

Method Summary

Methods

Modifier and Type	Method and Description
SelectItem	entry() Return a select item corresponding to the map entry of a map-valued association or element collection.
Expression	index() Return an expression that corresponds to the index.
DomainObject	join(String attribute) Extend the query domain by joining with a class that can be navigated to or that is embedded in the class corresponding to the domain object on which the method is invoked.
FetchJoinObject	joinFetch(String attribute) Specify that the association or element collection that is referenced by the attribute be eagerly fetched through use of an inner join.
PathExpression	key() Return a path expression corresponding to the key of a map-valued association or element collection.
DomainObject	leftJoin(String attribute) Extend the query domain by left outer joining with a class that can be navigated to or that is embedded in the class corresponding to the domain object on which the method is invoked.
FetchJoinObject	leftJoinFetch(String attribute) Specify that the association or element collection that is referenced by the attribute be eagerly fetched through use of a left outer join.
PathExpression	value() Return a path expression corresponding to the value of a map-valued association or element collection.

Methods inherited from interface org.apache.openjpa.persistence.query.PathExpression

avg, count, get, isEmpty, max, min, size, sum, type

Methods inherited from interface org.apache.openjpa.persistence.query.Expression

abs, concat, concat, dividedBy, dividedBy, in, in, in, in, in, in, isNull, length, locate, locate, locate, locate, locate, locate, lower, member, minus, minus, minus, mod, mod, plus, plus, sqrt, substring, substring, substring, substring, substring, substring, times, times, trim, trim, trim, trim, trim, trim, upper

Methods inherited from interface org.apache.openjpa.persistence.query.SelectItem

asc, desc

Methods inherited from interface org.apache.openjpa.persistence.query.QueryDefinition

addRoot, addSubqueryRoot, all, any, coalesce, coalesce, coalesce, coalesce, currentDate, currentTime, currentTimestamp, exists, generalCase, groupBy, groupBy, having, literal, literal, literal, literal, literal, literal, literal, literal, newInstance, nullif, nullif, nullif, nullif, nullif, nullif, nullif, nullLiteral, orderBy, orderBy, param, predicate, select, select, selectDistinct, selectDistinct, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, simpleCase, some, where

Methods inherited from interface org.apache.openjpa.persistence.query.PredicateOperand

between, between, between, between, between, between, between, between, between, between, between, between, between, equal, equal, equal, equal, equal, equal, equal, equal, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterEqual, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, lessEqual, lessEqual, lessEqual, lessEqual, lessEqual, lessThan, lessThan, lessThan, lessThan, lessThan, like, like, like, like, like, like, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual, notEqual

Method Detail

join

DomainObject join(String attribute)

Extend the query domain by joining with a class that can be navigated to or that is embedded in the class corresponding to the domain object on which the method is invoked. This method is permitted to be invoked only when defining the domain of the query. It must not be invoked within the context of the select, where, groupBy, or having operations. The domain object must correspond to a class that contains the referenced attribute. The query definition is modified to include the newly joined domain object.

Parameters:

attribute - - name of the attribute that references the target of the join

Returns:

the new DomainObject that is added for the target of the join

leftJoin

DomainObject leftJoin(String attribute)

Extend the query domain by left outer joining with a class that can be navigated to or that is embedded in the class corresponding to the domain object on which the method is invoked. This method is permitted to be invoked only when defining the domain of the query. It must not be invoked within the context of the select, where, groupBy, or having operations. The domain object must correspond to a class that contains the referenced attribute. The query definition is modified to include the newly joined domain object.

Parameters:

attribute - - name of the attribute that references the target of the join

Returns:

the new DomainObject that is added for the target of the join

joinFetch

FetchJoinObject joinFetch(String attribute)

Specify that the association or element collection that is referenced by the attribute be eagerly fetched through use of an inner join. The domain object must correspond to a class that contains the referenced attribute. The query is modified to include the joined domain object.

Parameters:

attribute - - name of the attribute that references the target of the join

Returns:

the FetchJoinObject that is added for the target of the join

leftJoinFetch

FetchJoinObject leftJoinFetch(String attribute)

Specify that the association or element collection that is referenced by the attribute be eagerly fetched through use of a left outer join. The domain object must correspond to a class that contains the referenced attribute. The query is modified to include the joined domain object.

Parameters:

attribute - - name of the attribute that references the target of the join

Returns:

the FetchJoinObject that is added for the target of the join

value

PathExpression value()

Return a path expression corresponding to the value of a map-valued association or element collection. This method is only permitted to be invoked upon a domain object that corresponds to a map-valued association or element collection.

Returns:

PathExpression corresponding to the map value

key

PathExpression key()

Return a path expression corresponding to the key of a map-valued association or element collection. This method is only permitted to be invoked upon a domain object that corresponds to a map-valued association or element collection.

Returns:

PathExpression corresponding to the map key

entry

SelectItem entry()

Return a select item corresponding to the map entry of a map-valued association or element collection. This method is only permitted to be invoked upon a domain object that corresponds to a map-valued association or element collection.

Returns:

SelectItem corresponding to the map entry

index

Expression index()

Return an expression that corresponds to the index. of the domain object in the referenced association or element collection. This method is only permitted to be invoked upon a domain object that corresponds to a multi-valued association or element collection for which an order column has been defined.

Returns:

Expression denoting the index