com.querydsl.jpa

Class JPAExpressions

java.lang.Object

com.querydsl.jpa.JPAExpressions

public final class JPAExpressions
extends Object

JPAExpressions provides factory methods for JPQL specific operations elements.

Author:

tiwe

Method Summary

Modifier and Type	Method and Description
static <A extends Comparable<? super A>> ComparableExpression<A>	avg(CollectionExpression<?,A> col) Create a avg(col) expression
static <A extends Comparable<? super A>> ComparableExpression<A>	max(CollectionExpression<?,A> left) Create a max(col) expression
static <A extends Comparable<? super A>> ComparableExpression<A>	min(CollectionExpression<?,A> left) Create a min(col) expression
static JPQLQuery<Tuple>	select(Expression<?>... exprs) Create a new detached JPQLQuery instance with the given projection
static <T> JPQLQuery<T>	select(Expression<T> expr) Create a new detached JPQLQuery instance with the given projection
static JPQLQuery<Tuple>	selectDistinct(Expression<?>... exprs) Create a new detached JPQLQuery instance with the given projection
static <T> JPQLQuery<T>	selectDistinct(Expression<T> expr) Create a new detached JPQLQuery instance with the given projection
static <T> JPQLQuery<T>	selectFrom(EntityPath<T> expr) Create a new detached JPQLQuery instance with the given projection
static JPQLQuery<Integer>	selectOne() Create a new detached JPQLQuery instance with the projection one
static JPQLQuery<Integer>	selectZero() Create a new detached JPQLQuery instance with the projection zero
static StringExpression	type(EntityPath<?> path) Create a type(path) expression

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

select

public static <T> JPQLQuery<T> select(Expression<T> expr)

Create a new detached JPQLQuery instance with the given projection

Type Parameters:

T -

Parameters:

expr - projection

Returns:

select(expr)

select

public static JPQLQuery<Tuple> select(Expression<?>... exprs)

Create a new detached JPQLQuery instance with the given projection

Parameters:

exprs - projection

Returns:

select(exprs)

selectDistinct

public static <T> JPQLQuery<T> selectDistinct(Expression<T> expr)

Create a new detached JPQLQuery instance with the given projection

Type Parameters:

T -

Parameters:

expr - projection

Returns:

select(distinct expr)

selectDistinct

public static JPQLQuery<Tuple> selectDistinct(Expression<?>... exprs)

Create a new detached JPQLQuery instance with the given projection

Parameters:

exprs - projection

Returns:

select(distinct expr)

selectZero

public static JPQLQuery<Integer> selectZero()

Create a new detached JPQLQuery instance with the projection zero

Returns:

select(0)

selectOne

public static JPQLQuery<Integer> selectOne()

Create a new detached JPQLQuery instance with the projection one

Returns:

select(1)

selectFrom

public static <T> JPQLQuery<T> selectFrom(EntityPath<T> expr)

Create a new detached JPQLQuery instance with the given projection

Type Parameters:

T -

Parameters:

expr - projection and source

Returns:

select(expr).from(expr)

avg

public static <A extends Comparable<? super A>> ComparableExpression<A> avg(CollectionExpression<?,A> col)

Create a avg(col) expression

Parameters:

col - collection

Returns:

avg(col)

max

public static <A extends Comparable<? super A>> ComparableExpression<A> max(CollectionExpression<?,A> left)

Create a max(col) expression

Parameters:

left - collection

Returns:

max(col)

min

public static <A extends Comparable<? super A>> ComparableExpression<A> min(CollectionExpression<?,A> left)

Create a min(col) expression

Parameters:

left - collection

Returns:

min(col)

type

public static StringExpression type(EntityPath<?> path)

Create a type(path) expression

Parameters:

path - entity

Returns:

type(path)