javax.jdo

Interface JDOQLTypedSubquery<T>

Type Parameters:

T - (Candidate) type being represented

All Superinterfaces:

Serializable

public interface JDOQLTypedSubquery<T>
extends Serializable

Interface for a type-safe subquery, using a fluent API. Users should call methods on the subquery instance and end with a select of what the subquery returns; this returns the expression that they use to link it with the owning query.

Method Summary

Modifier and Type	Method and Description
PersistableExpression<T>	candidate() Method to return an expression for the candidate of the subquery.
JDOQLTypedSubquery<T>	filter(BooleanExpression expr) Method to set the filter of the query.
JDOQLTypedSubquery<T>	groupBy(Expression<?>... exprs) Method to set the grouping(s) for the query.
JDOQLTypedSubquery<T>	having(Expression<?> expr) Method to set the having clause of the query.
CollectionExpression<?,?>	select(CollectionExpression<?,?> expr) Accessor for the subquery (collection) expression from the subquery.
CharacterExpression	selectUnique(CharacterExpression expr) Accessor for the subquery (character) expression from the subquery when the subquery returns a single value.
DateExpression	selectUnique(DateExpression expr) Accessor for the subquery (date) expression from the subquery when the subquery returns a single value.
DateTimeExpression	selectUnique(DateTimeExpression expr) Accessor for the subquery (datetime) expression from the subquery when the subquery returns a single value.
<S> NumericExpression<S>	selectUnique(NumericExpression<S> expr) Accessor for the subquery (numeric) expression from the subquery when the subquery returns a single value.
StringExpression	selectUnique(StringExpression expr) Accessor for the subquery (string) expression from the subquery when the subquery returns a single value.
TimeExpression	selectUnique(TimeExpression expr) Accessor for the subquery (time) expression from the subquery when the subquery returns a single value.

Method Detail

candidate

PersistableExpression<T> candidate()

Method to return an expression for the candidate of the subquery. Cast the returned expression to the candidate "Q" type to be able to call methods on it.

Returns:

Expression for the candidate

filter

JDOQLTypedSubquery<T> filter(BooleanExpression expr)

Method to set the filter of the query.

Parameters:

expr - Filter expression

Returns:

The query

groupBy

JDOQLTypedSubquery<T> groupBy(Expression<?>... exprs)

Method to set the grouping(s) for the query.

Parameters:

exprs - Grouping expression(s)

Returns:

The query

having

JDOQLTypedSubquery<T> having(Expression<?> expr)

Method to set the having clause of the query.

Parameters:

expr - Having expression

Returns:

The query

selectUnique

<S> NumericExpression<S> selectUnique(NumericExpression<S> expr)

Accessor for the subquery (numeric) expression from the subquery when the subquery returns a single value.

Type Parameters:

S - numeric type

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

selectUnique

StringExpression selectUnique(StringExpression expr)

Accessor for the subquery (string) expression from the subquery when the subquery returns a single value.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

selectUnique

DateExpression selectUnique(DateExpression expr)

Accessor for the subquery (date) expression from the subquery when the subquery returns a single value.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

selectUnique

DateTimeExpression selectUnique(DateTimeExpression expr)

Accessor for the subquery (datetime) expression from the subquery when the subquery returns a single value.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

selectUnique

TimeExpression selectUnique(TimeExpression expr)

Accessor for the subquery (time) expression from the subquery when the subquery returns a single value.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

selectUnique

CharacterExpression selectUnique(CharacterExpression expr)

Accessor for the subquery (character) expression from the subquery when the subquery returns a single value.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query

select

CollectionExpression<?,?> select(CollectionExpression<?,?> expr)

Accessor for the subquery (collection) expression from the subquery.

Parameters:

expr - The expression

Returns:

Expression for the typesafe query