org.apache.openjpa.jdbc.sql

Interface Union

All Superinterfaces:

SelectExecutor

All Known Implementing Classes:

LogicalUnion

public interface Union
extends SelectExecutor

SQL UNION.

Author:

Abe White

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Union.Selector A callback used to create the selects in a SQL union.

Method Summary

Modifier and Type	Method and Description
void	abortUnion() Force the use of a series of standard selects rather than a true UNION.
String	getOrdering() Get the union-level ordering, if any.
Select[]	getSelects() Return the selects that make up this union.
boolean	isUnion() Whether this is a true UNION, rather than a logical combination of independent selects.
void	select(Union.Selector selector) Select data using the given selector.

Methods inherited from interface org.apache.openjpa.jdbc.sql.SelectExecutor

execute, execute, getAutoDistinct, getConfiguration, getCount, getExpectedResultCount, getJoinSyntax, getSQL, hasMultipleSelects, isDistinct, isLRS, setAutoDistinct, setDistinct, setExpectedResultCount, setJoinSyntax, setLRS, supportsLocking, supportsRandomAccess, toSelect, toSelectCount

Method Detail

getSelects

Select[] getSelects()

Return the selects that make up this union.

getOrdering

String getOrdering()

Get the union-level ordering, if any.

isUnion

boolean isUnion()

Whether this is a true UNION, rather than a logical combination of independent selects.

abortUnion

void abortUnion()

Force the use of a series of standard selects rather than a true UNION.

select

void select(Union.Selector selector)

Select data using the given selector.