org.h2.index

类 PageBtree

java.lang.Object

org.h2.util.CacheObject

org.h2.store.Page

org.h2.index.PageBtree

所有已实现的接口:

Comparable<CacheObject>

直接已知子类:

PageBtreeLeaf, PageBtreeNode

public abstract class PageBtree
extends Page

A page that contains index data.

字段概要

字段

限定符和类型	字段和说明
protected Data	data The data page.
protected int	entryCount The number of entries.
protected PageBtreeIndex	index The index.
protected int[]	offsets The row offsets.
protected boolean	onlyPosition If only the position of the row is stored in the page
protected int	parentPageId The page number of the parent.
protected SearchRow[]	rows The index data
protected int	start The start of the data area.
protected boolean	written Whether the data page is up-to-date.

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.
protected void	memoryChange() The memory usage of this page was changed.
protected void	readAllRows() Ensure all rows are read in memory.

从类继承的方法 org.h2.store.Page

add, canMove, insert, insert, insert, moveTo, remove, remove, remove, write

从类继承的方法 org.h2.util.CacheObject

compareTo, getPos, isChanged, isStream, setChanged, setPos

从类继承的方法 java.lang.Object

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

字段详细资料

index

protected final PageBtreeIndex index

The index.

parentPageId

protected int parentPageId

The page number of the parent.

data

protected final Data data

The data page.

offsets

protected int[] offsets

The row offsets.

entryCount

protected int entryCount

The number of entries.

rows

protected SearchRow[] rows

The index data

start

protected int start

The start of the data area.

onlyPosition

protected boolean onlyPosition

If only the position of the row is stored in the page

written

protected boolean written

Whether the data page is up-to-date.

方法详细资料

memoryChange

protected void memoryChange()

The memory usage of this page was changed. Propagate the change if needed.

readAllRows

protected void readAllRows()

Ensure all rows are read in memory.

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)

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