org.h2.index
Class BtreeNode

java.lang.Object
  org.h2.util.CacheObject
      org.h2.store.Record
          org.h2.index.BtreePage
              org.h2.index.BtreeNode

public class BtreeNode
extends BtreePage

An inner page of a b-tree index. Page format:

 N children.len children[0..len] data.len { data[0].pos [data[0]], ...  }

Field Summary

Fields inherited from class org.h2.index.BtreePage

BLOCKS_PER_PAGE, index, pageData, root

Fields inherited from class org.h2.util.CacheObject

blockCount, cacheQueue, chained, next, previous

Method Summary

void	prepareWrite() This method is called just before the page is written.
void	write(DataPage buff) Write the record to the data page.

Methods inherited from class org.h2.index.BtreePage

getByteCount, isEmpty, isPinned

Methods inherited from class org.h2.store.Record

canRemove, commit, getSessionId, getStorageId, isDeleted, isLogWritten, setDeleted, setLastLog, setLogWritten, setSessionId, setStorageId

Methods inherited from class org.h2.util.CacheObject

getBlockCount, getMemorySize, getPos, isChanged, setBlockCount, setChanged, setPos, sort

Methods inherited from class java.lang.Object

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

Method Detail

prepareWrite

public void prepareWrite()
                  throws java.sql.SQLException

Description copied from class: Record

This method is called just before the page is written. If a read operation is required before writing, this needs to be done here. Because the data page buffer is shared for read and write operations. The method may read data and change the file pointer.

Overrides:

prepareWrite in class Record

Throws:

java.sql.SQLException

write

public void write(DataPage buff)
           throws java.sql.SQLException

Description copied from class: Record

Write the record to the data page.

Specified by:

write in class Record

Parameters:

buff - the data page

Throws:

java.sql.SQLException