org.hsqldb
Class CachedRow

java.lang.Object
  org.hsqldb.Row
      org.hsqldb.CachedRow

public class CachedRow

extends org.hsqldb.Row

In-memory representation of a disk-based database row object with methods for serialization and de-serialization.
A CachedRow is normally part of a circular double linked list which contians all the Rows currently in the Cache for the database. It is unlinked from this list when it is freed from the Cache to make way for other rows.

Version:

1.7.2

Field Summary

protected boolean	hasChanged Flag indicating any change to the Nodes or table row data.
protected boolean	hasDataChanged Flag indicating the row data has changed too.
protected org.hsqldb.Node	nPrimaryNode
protected Object[]	oData
protected Table	tTable

Constructor Summary

CachedRow(Table t, Object[] o)
Constructor for new Rows.

CachedRow(Table t, RowInputInterface in)
constructor when read from the disk into the Cache

Method Summary

Object[]	getData() Returns the array of fields in the database row.
Table	getTable() Returns the table which this Row belongs to.

Methods inherited from class java.lang.Object

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

Field Detail

tTable

protected Table tTable

hasChanged

protected boolean hasChanged

Flag indicating any change to the Nodes or table row data.

hasDataChanged

protected boolean hasDataChanged

Flag indicating the row data has changed too.

oData

protected Object[] oData

nPrimaryNode

protected org.hsqldb.Node nPrimaryNode

Constructor Detail

CachedRow

public CachedRow(Table t,
                 Object[] o)
          throws HsqlException

Constructor for new Rows. This is currently the only place where hasDataChanged is set to true as the current implementation of database row updates performs a delete followed by an insert. This means that once a row is created its data cannot change. (correct as of version 1_7_2_alpha_n)

CachedRow

public CachedRow(Table t,
                 RowInputInterface in)
          throws IOException,
                 HsqlException

constructor when read from the disk into the Cache

Method Detail

getTable

public Table getTable()

Returns the table which this Row belongs to.

getData

public Object[] getData()

Returns the array of fields in the database row. If the table has no primary index, an extra internal field is included in the last position of this array.