org.h2.index

Class NonUniqueHashIndex

java.lang.Object

org.h2.engine.DbObjectBase

org.h2.schema.SchemaObjectBase

org.h2.index.BaseIndex

org.h2.index.HashIndex

org.h2.index.NonUniqueHashIndex

All Implemented Interfaces:

DbObject, Index, SchemaObject

public class NonUniqueHashIndex
extends HashIndex

A non-unique index based on an in-memory hash map.

Author:

Sergi Vladykin

Field Summary

Fields inherited from class org.h2.index.HashIndex

indexColumn

Fields inherited from class org.h2.index.BaseIndex

columnIds, columns, indexColumns, indexType, isMultiVersion, table

Fields inherited from class org.h2.engine.DbObjectBase

comment, database, trace

Fields inherited from interface org.h2.engine.DbObject

AGGREGATE, COMMENT, CONSTANT, CONSTRAINT, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, TABLE_OR_VIEW, TRIGGER, USER, USER_DATATYPE

Constructor Summary

Constructors

Constructor and Description
NonUniqueHashIndex(RegularTable table, int id, String indexName, IndexColumn[] columns, IndexType indexType)

Method Summary

Methods

Modifier and Type	Method and Description
void	add(Session session, Row row) Add a row to the index.
Cursor	find(Session session, SearchRow first, SearchRow last) Find a row or a list of rows and create a cursor to iterate over the result.
long	getRowCount(Session session) Get the row count of this table, for the given session.
long	getRowCountApproximation() Get the approximated row count for this table.
void	remove(Session session, Row row) Remove a row from the index.
void	truncate(Session session) Remove all rows from the index.

Methods inherited from class org.h2.index.HashIndex

canGetFirstOrLast, canScan, checkRename, close, findFirstOrLast, getCost, needRebuild, remove

Methods inherited from class org.h2.index.BaseIndex

canFindNext, commit, compareRows, find, findNext, getColumnIndex, getColumns, getCreateSQL, getCreateSQLForCopy, getDropSQL, getIndexColumns, getIndexType, getPlanSQL, getRow, getTable, getType, initBaseIndex, isHidden, isRowIdIndex, removeChildrenAndResources, setSortedInsertMode

Methods inherited from class org.h2.schema.SchemaObjectBase

getSchema, getSQL, initSchemaObjectBase

Methods inherited from class org.h2.engine.DbObjectBase

getChildren, getComment, getDatabase, getId, getModificationId, getName, initDbObjectBase, invalidate, isTemporary, rename, setComment, setModified, setObjectName, setTemporary, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2.schema.SchemaObject

getSchema

Methods inherited from interface org.h2.engine.DbObject

getChildren, getComment, getDatabase, getId, getName, getSQL, isTemporary, rename, setComment, setTemporary

Constructor Detail

NonUniqueHashIndex

public NonUniqueHashIndex(RegularTable table,
                  int id,
                  String indexName,
                  IndexColumn[] columns,
                  IndexType indexType)

Method Detail

truncate

public void truncate(Session session)

Description copied from interface: Index

Remove all rows from the index.

Specified by:

truncate in interface Index

Overrides:

truncate in class HashIndex

Parameters:

session - the session

add

public void add(Session session,
       Row row)

Description copied from interface: Index

Add a row to the index.

Specified by:

add in interface Index

Overrides:

add in class HashIndex

Parameters:

session - the session to use

row - the row to add

remove

public void remove(Session session,
          Row row)

Description copied from interface: Index

Remove a row from the index.

Specified by:

remove in interface Index

Overrides:

remove in class HashIndex

Parameters:

session - the session

row - the row

find

public Cursor find(Session session,
          SearchRow first,
          SearchRow last)

Description copied from interface: Index

Find a row or a list of rows and create a cursor to iterate over the result.

Specified by:

find in interface Index

Overrides:

find in class HashIndex

Parameters:

session - the session

first - the first row, or null for no limit

last - the last row, or null for no limit

Returns:

the cursor to iterate over the results

getRowCount

public long getRowCount(Session session)

Description copied from interface: Index

Get the row count of this table, for the given session.

Specified by:

getRowCount in interface Index

Overrides:

getRowCount in class HashIndex

Parameters:

session - the session

Returns:

the row count

getRowCountApproximation

public long getRowCountApproximation()

Description copied from interface: Index

Get the approximated row count for this table.

Specified by:

getRowCountApproximation in interface Index

Overrides:

getRowCountApproximation in class HashIndex

Returns:

the approximated row count