org.h2.index

类 IndexCursor

java.lang.Object

org.h2.index.IndexCursor

所有已实现的接口:

Cursor

public class IndexCursor
extends Object
implements Cursor

The filter used to walk through an index. This class supports IN(..) and IN(SELECT ...) optimizations.

作者:

Thomas Mueller, Noel Grandin, Nicolas Fortin, Atelier SIG, IRSTV FR CNRS 24888

构造器概要

构造器

构造器和说明
IndexCursor(TableFilter filter)

方法概要

限定符和类型	方法和说明
void	find(Session s, ArrayList<IndexCondition> indexConditions) Re-evaluate the start and end values of the index search for rows.
Row	get() Get the complete current row.
SearchRow	getEnd() Get end search row.
SearchRow	getSearchRow() Get the current row.
SearchRow	getStart() Get start search row.
boolean	isAlwaysFalse() Check if the result is empty for sure.
boolean	next() Skip to the next row if one is available.
void	prepare(Session s, ArrayList<IndexCondition> indexConditions) Prepare this index cursor to make a lookup in index.
boolean	previous() Skip to the previous row if one is available.
void	setIndex(Index index)

从类继承的方法 java.lang.Object

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

构造器详细资料

IndexCursor

public IndexCursor(TableFilter filter)

方法详细资料

setIndex

public void setIndex(Index index)

prepare

public void prepare(Session s,
                    ArrayList<IndexCondition> indexConditions)

Prepare this index cursor to make a lookup in index.

参数:

s - Session.

indexConditions - Index conditions.

find

public void find(Session s,
                 ArrayList<IndexCondition> indexConditions)

Re-evaluate the start and end values of the index search for rows.

参数:

s - the session

indexConditions - the index conditions

isAlwaysFalse

public boolean isAlwaysFalse()

Check if the result is empty for sure.

返回:

true if it is

getStart

public SearchRow getStart()

Get start search row.

返回:

search row

getEnd

public SearchRow getEnd()

Get end search row.

返回:

search row

get

public Row get()

从接口复制的说明: Cursor

Get the complete current row. All column are available.

指定者:

get 在接口中 Cursor

返回:

the complete row

getSearchRow

public SearchRow getSearchRow()

从接口复制的说明: Cursor

Get the current row. Only the data for indexed columns is available in this row.

指定者:

getSearchRow 在接口中 Cursor

返回:

the search row

next

public boolean next()

从接口复制的说明: Cursor

Skip to the next row if one is available.

指定者:

next 在接口中 Cursor

返回:

true if another row is available

previous

public boolean previous()

从接口复制的说明: Cursor

Skip to the previous row if one is available. No filtering is made here.

指定者:

previous 在接口中 Cursor

返回:

true if another row is available