Union (OpenJPA Parent POM 4.0.0 API)

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 Description

static interface Union.Selector
A callback used to create the selects in a SQL union.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`abortUnion()`	Force the use of a series of standard selects rather than a true UNION.
`java.lang.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
```
java.lang.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.