kodo.jdbc.sql
Class TrueUnion

java.lang.Object
  org.apache.openjpa.jdbc.sql.LogicalUnion
      kodo.jdbc.sql.TrueUnion

All Implemented Interfaces:

SelectExecutor, Union

public class TrueUnion
extends LogicalUnion

True SQL UNION. The following limitations apply:

• Zero or one mapping per select.
• If non-column ordering critieria is added or incompatible ordering columns are selected, the UNION will fallback to a logical union.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.openjpa.jdbc.sql.LogicalUnion

LogicalUnion.Selector, LogicalUnion.UnionSelect

Field Summary

Fields inherited from class org.apache.openjpa.jdbc.sql.LogicalUnion

desc, dict, mappings, sels

Constructor Summary

TrueUnion(JDBCConfiguration conf, int selects)
Constructor.

TrueUnion(JDBCConfiguration conf, Select[] seeds)
Constructor used to seed the internal selects.

Method Summary

void	abortUnion()
Result	execute(JDBCStore store, JDBCFetchConfiguration fetch, int lockLevel)
int	getCount(JDBCStore store)
String	getOrdering()
boolean	isUnion()
protected LogicalUnion.UnionSelect	newUnionSelect(SelectImpl seed, int pos)
void	select(Union.Selector selector)
boolean	supportsLocking()
boolean	supportsRandomAccess(boolean forUpdate)
SQLBuffer	toSelect(boolean forUpdate, JDBCFetchConfiguration fetch)
SQLBuffer	toSelectCount()

Methods inherited from class org.apache.openjpa.jdbc.sql.LogicalUnion

execute, getAutoDistinct, getConfiguration, getDBDictionary, getExpectedResultCount, getJoinSyntax, getSelects, isDistinct, isLRS, setAutoDistinct, setDistinct, setExpectedResultCount, setJoinSyntax, setLRS, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

TrueUnion

public TrueUnion(JDBCConfiguration conf,
                 int selects)

Constructor.

Parameters:

conf - system configuration

selects - the number of SQL selects to union together

TrueUnion

public TrueUnion(JDBCConfiguration conf,
                 Select[] seeds)

Constructor used to seed the internal selects.

Method Detail

newUnionSelect

protected LogicalUnion.UnionSelect newUnionSelect(SelectImpl seed,
                                                  int pos)

Overrides:

newUnionSelect in class LogicalUnion

isUnion

public boolean isUnion()

Specified by:

isUnion in interface Union

Overrides:

isUnion in class LogicalUnion

abortUnion

public void abortUnion()

Specified by:

abortUnion in interface Union

Overrides:

abortUnion in class LogicalUnion

getOrdering

public String getOrdering()

Specified by:

getOrdering in interface Union

Overrides:

getOrdering in class LogicalUnion

toSelect

public SQLBuffer toSelect(boolean forUpdate,
                          JDBCFetchConfiguration fetch)

Specified by:

toSelect in interface SelectExecutor

Overrides:

toSelect in class LogicalUnion

toSelectCount

public SQLBuffer toSelectCount()

Specified by:

toSelectCount in interface SelectExecutor

Overrides:

toSelectCount in class LogicalUnion

supportsRandomAccess

public boolean supportsRandomAccess(boolean forUpdate)

Specified by:

supportsRandomAccess in interface SelectExecutor

Overrides:

supportsRandomAccess in class LogicalUnion

supportsLocking

public boolean supportsLocking()

Specified by:

supportsLocking in interface SelectExecutor

Overrides:

supportsLocking in class LogicalUnion

getCount

public int getCount(JDBCStore store)
             throws SQLException

Specified by:

getCount in interface SelectExecutor

Overrides:

getCount in class LogicalUnion

Throws:

SQLException

execute

public Result execute(JDBCStore store,
                      JDBCFetchConfiguration fetch,
                      int lockLevel)
               throws SQLException

Specified by:

execute in interface SelectExecutor

Overrides:

execute in class LogicalUnion

Throws:

SQLException

select

public void select(Union.Selector selector)

Specified by:

select in interface Union

Overrides:

select in class LogicalUnion