net.sf.mmm.util.query.api.feature

Interface FeatureSelect

All Superinterfaces:

StatementFactoryFeature

All Known Subinterfaces:

JpqlStatementFactory, OrientDbStatementFactory, StatementFactory

All Known Implementing Classes:

AbstractStatementFactory, JpqlStatementFactoryImpl, OrientDbStatementFactoryImpl

public interface FeatureSelect
extends StatementFactoryFeature

StatementFactoryFeature for a StatementFactory supporting a SelectStatement.

Since:

8.0.0

Author:

hohwille

Method Summary

Modifier and Type	Method and Description
<E> SelectStatement<E,?>	selectFrom(EntityAlias<?> alias, Class<E> toClass, PropertyPath<?>... constructorArgs) Creates SelectStatement for a projection to a transfer-object having an according constructor.
SelectStatement<Object[],?>	selectFrom(EntityAlias<?> alias, PropertyPath<?>... paths) Creates SelectStatement for a tuple of the given {paths ( {@code SELECT path1, path2, ...
<E> SelectStatement<E,?>	selectFrom(EntityAlias<E> alias) Creates a regular SelectStatement (SELECT FROM alias.source [AS alias.name] ...).

Method Detail

selectFrom

<E> SelectStatement<E,?> selectFrom(EntityAlias<E> alias)

Creates a regular SelectStatement (SELECT FROM alias.source [AS alias.name] ...).

Type Parameters:

E - the generic type of the entity to select.

Parameters:

alias - the EntityAlias to select from.

Returns:

the new SelectStatement.

selectFrom

SelectStatement<Object[],?> selectFrom(EntityAlias<?> alias,
                                       PropertyPath<?>... paths)

Creates SelectStatement for a tuple of the given {paths ( SELECT path1, path2, ... FROM alias.source [AS alias.name] ...).

Parameters:

alias - the EntityAlias to select from.

paths - the PropertyPaths to select.

Returns:

the new SelectStatement.

selectFrom

<E> SelectStatement<E,?> selectFrom(EntityAlias<?> alias,
                                    Class<E> toClass,
                                    PropertyPath<?>... constructorArgs)

Creates SelectStatement for a projection to a transfer-object having an according constructor. In JPA this is called a constructor query ( SELECT NEW package.Classname(arg1, arg2, ...) FROM alias.source [AS alias.name] ...). If not natively supported this is implemented as a projection based on a tuple selection.

Type Parameters:

E - the generic type of the transfer-object to select.

Parameters:

alias - the EntityAlias to select from.

toClass - the transfer-object to use. Will be instantiated via the Constructor matching to the value types of the constructorArgs.

constructorArgs - the selection paths (or aggregate expressions).

Returns:

the new SelectStatement.