com.querydsl.core

Interface Fetchable<T>

Type Parameters:

T - result type

All Known Subinterfaces:

FetchableQuery<T,Q>

All Known Implementing Classes:

FetchableQueryBase, FetchableSubQueryBase

public interface Fetchable<T>

Fetchable defines default projection methods for Query implementations. All Querydsl query implementations should implement this interface.

Author:

tiwe

Method Summary

Modifier and Type	Method and Description
java.util.List<T>	fetch() Get the projection as a typed List
long	fetchCount() Get the count of matched elements Note: not all QueryDSL modules might optimize fetchCount using a count query.
T	fetchFirst() Get the first result of Get the projection or null if no result is found
T	fetchOne() Get the projection as a unique result or null if no result is found
QueryResults<T>	fetchResults() Get the projection in QueryResults form.
com.mysema.commons.lang.CloseableIterator<T>	iterate() Get the projection as a typed closeable Iterator
default java.util.stream.Stream<T>	stream() Get the projection as a typed closeable Stream.

Method Detail

fetch

java.util.List<T> fetch()

Get the projection as a typed List

Returns:

results in list form

fetchFirst

T fetchFirst()

Get the first result of Get the projection or null if no result is found

Returns:

first result or null

fetchOne

T fetchOne()
    throws NonUniqueResultException

Get the projection as a unique result or null if no result is found

Returns:

first result or null

Throws:

NonUniqueResultException - if there is more than one matching result

iterate

com.mysema.commons.lang.CloseableIterator<T> iterate()

Get the projection as a typed closeable Iterator

Returns:

closeable iterator

stream

default java.util.stream.Stream<T> stream()

Get the projection as a typed closeable Stream.

Returns:

closeable stream

fetchResults

QueryResults<T> fetchResults()

Get the projection in QueryResults form. Make sure to use fetch() instead if you do not rely on the QueryResults.getOffset() or QueryResults.getLimit(), because it will be more performant. Also, count queries cannot be properly generated for all dialects. For example: in JPA count queries can't be generated for queries that have multiple group by expressions or a having clause. Get the projection in QueryResults form. Use fetch() instead if you do not need the total count of rows in the query result.

Returns:

results

See Also:

fetch()

fetchCount

long fetchCount()

Get the count of matched elements Note: not all QueryDSL modules might optimize fetchCount using a count query. An implementation is allowed to fall back to fetch().size().

Returns:

row count