org.h2.index

类 PageDataOverflow

java.lang.Object

org.h2.util.CacheObject

org.h2.store.Page

org.h2.index.PageDataOverflow

所有已实现的接口:

Comparable<CacheObject>

public class PageDataOverflow
extends Page

Overflow data for a leaf page. Format:

• page type: byte (0)
• checksum: short (1-2)
• parent page id (0 for root): int (3-6)
• more data: next overflow page id: int (7-10)
• last remaining size: short (7-8)
• data (11-/9-)

字段概要

从类继承的字段 org.h2.store.Page

changeCount, FLAG_LAST, TYPE_BTREE_LEAF, TYPE_BTREE_NODE, TYPE_DATA_LEAF, TYPE_DATA_NODE, TYPE_DATA_OVERFLOW, TYPE_EMPTY, TYPE_FREE_LIST, TYPE_STREAM_DATA, TYPE_STREAM_TRUNK

从类继承的字段 org.h2.util.CacheObject

cacheChained, cacheNext, cachePrevious

方法概要

限定符和类型	方法和说明
boolean	canRemove() Check if the object can be removed from the cache.
int	getMemory() Get the estimated memory size.
boolean	isStream()
void	moveTo(Session session, int newPos) Copy the data to a new location, change the parent to point to the new location, and free up the current page.
static Page	read(PageStore store, Data data, int pageId) Read an overflow page.
String	toString()
void	write() Write the page.

从类继承的方法 org.h2.store.Page

add, canMove, insert, insert, insert, remove, remove, remove

从类继承的方法 org.h2.util.CacheObject

compareTo, getPos, isChanged, setChanged, setPos

从类继承的方法 java.lang.Object

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

方法详细资料

read

public static Page read(PageStore store,
                        Data data,
                        int pageId)

Read an overflow page.

参数:

store - the page store

data - the data

pageId - the page id

返回:

the page

write

public void write()

从类复制的说明: Page

Write the page.

指定者:

write 在类中 Page

toString

public String toString()

覆盖:

toString 在类中 Object

getMemory

public int getMemory()

Get the estimated memory size.

指定者:

getMemory 在类中 CacheObject

返回:

number of double words (4 bytes)

moveTo

public void moveTo(Session session,
                   int newPos)

从类复制的说明: Page

Copy the data to a new location, change the parent to point to the new location, and free up the current page.

指定者:

moveTo 在类中 Page

参数:

session - the session

newPos - the new position

canRemove

public boolean canRemove()

从类复制的说明: CacheObject

Check if the object can be removed from the cache. For example pinned objects can not be removed.

指定者:

canRemove 在类中 CacheObject

返回:

true if it can be removed

isStream

public boolean isStream()

覆盖:

isStream 在类中 CacheObject