Package org.h2.index

Class LinkedIndex

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.index.Index

org.h2.index.LinkedIndex

All Implemented Interfaces:

HasSQL

public class LinkedIndex
extends Index

A linked index is a index for a linked (remote) table. It is backed by an index on the remote table which is accessed over JDBC.

Field Summary

Fields inherited from class org.h2.index.Index

columnIds, columns, indexColumns, indexType, table, uniqueColumnColumn

Fields inherited from class org.h2.engine.DbObject

AGGREGATE, comment, COMMENT, CONSTANT, CONSTRAINT, database, DOMAIN, FUNCTION_ALIAS, INDEX, RIGHT, ROLE, SCHEMA, SEQUENCE, SETTING, SYNONYM, TABLE_OR_VIEW, trace, TRIGGER, USER

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
LinkedIndex(TableLink table, int id, IndexColumn[] columns, int uniqueColumnCount, IndexType indexType)

Method Summary

Modifier and Type	Method	Description
void	add(SessionLocal session, Row row)	Add a row to the index.
void	checkRename()	Check if renaming is allowed.
void	close(SessionLocal session)	Close this index.
Cursor	find(SessionLocal session, SearchRow first, SearchRow last, boolean reverse)	Find a row or a list of rows and create a cursor to iterate over the result.
double	getCost(SessionLocal session, int[] masks, TableFilter[] filters, int filter, SortOrder sortOrder, AllColumnsForPlan allColumnsSet)	Estimate the cost to search for rows given the search mask.
String	getCreateSQL()	Construct the CREATE ...
long	getRowCount(SessionLocal session)	Get the row count of this table, for the given session.
long	getRowCountApproximation(SessionLocal session)	Get the approximated row count for this table.
boolean	needRebuild()	Check if the index needs to be rebuilt.
void	remove(SessionLocal session)	Remove the index.
void	remove(SessionLocal session, Row row)	Remove a row from the index.
void	truncate(SessionLocal session)	Remove all rows from the index.
void	update(Row oldRow, Row newRow, SessionLocal session)	Update a row using a UPDATE statement.

Methods inherited from class org.h2.index.Index

canFindNext, canGetFirstOrLast, canScan, checkIndexColumnTypes, compareRows, findFirstOrLast, findNext, getColumnIndex, getColumns, getCostRangeIndex, getCreateSQLForCopy, getDiskSpaceUsed, getDuplicateKeyException, getDuplicatePrimaryKeyMessage, getIndexColumns, getIndexType, getPlanSQL, getRow, getRowFactory, getTable, getType, getUniqueColumnCount, getUniqueRowFactory, isFindUsingFullTableScan, isFirstColumn, isRowIdIndex, needsUniqueCheck, removeChildrenAndResources, update

Methods inherited from class org.h2.schema.SchemaObject

getSchema, getSQL, getSQL

Methods inherited from class org.h2.engine.DbObject

getChildren, getComment, getCreateSQLForMeta, getDatabase, getDropSQL, getId, getModificationId, getName, invalidate, isTemporary, isValid, 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.util.HasSQL

getTraceSQL

Constructor Details

LinkedIndex

public LinkedIndex(TableLink table,
 int id,
 IndexColumn[] columns,
 int uniqueColumnCount,
 IndexType indexType)

Method Details

getCreateSQL

public String getCreateSQL()

Description copied from class: DbObject

Construct the CREATE ... SQL statement for this object.

Overrides:

getCreateSQL in class Index

Returns:

the SQL statement

close

public void close(SessionLocal session)

Description copied from class: Index

Close this index.

Specified by:

close in class Index

Parameters:

session - the session used to write data

add

public void add(SessionLocal session,
 Row row)

Description copied from class: Index

Add a row to the index.

Specified by:

add in class Index

Parameters:

session - the session to use

row - the row to add

find

public Cursor find(SessionLocal session,
 SearchRow first,
 SearchRow last,
 boolean reverse)

Description copied from class: Index

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

Specified by:

find in class Index

Parameters:

session - the session

first - the first row, or null for no limit

last - the last row, or null for no limit

reverse - if true, iterate in reverse (descending) order

Returns:

the cursor to iterate over the results

getCost

public double getCost(SessionLocal session,
 int[] masks,
 TableFilter[] filters,
 int filter,
 SortOrder sortOrder,
 AllColumnsForPlan allColumnsSet)

Description copied from class: Index

Estimate the cost to search for rows given the search mask. There is one element per column in the search mask. For possible search masks, see IndexCondition.

Specified by:

getCost in class Index

Parameters:

session - the session

masks - per-column comparison bit masks, null means 'always false', see constants in IndexCondition

filters - all joined table filters

filter - the current table filter index

sortOrder - the sort order

allColumnsSet - the set of all columns

Returns:

the estimated cost

remove

public void remove(SessionLocal session)

Description copied from class: Index

Remove the index.

Specified by:

remove in class Index

Parameters:

session - the session

truncate

public void truncate(SessionLocal session)

Description copied from class: Index

Remove all rows from the index.

Specified by:

truncate in class Index

Parameters:

session - the session

checkRename

public void checkRename()

Description copied from class: DbObject

Check if renaming is allowed. Does nothing when allowed.

Overrides:

checkRename in class DbObject

needRebuild

public boolean needRebuild()

Description copied from class: Index

Check if the index needs to be rebuilt. This method is called after opening an index.

Specified by:

needRebuild in class Index

Returns:

true if a rebuild is required.

remove

public void remove(SessionLocal session,
 Row row)

Description copied from class: Index

Remove a row from the index.

Specified by:

remove in class Index

Parameters:

session - the session

row - the row

update

public void update(Row oldRow,
 Row newRow,
 SessionLocal session)

Update a row using a UPDATE statement. This method is to be called if the emit updates option is enabled.

Parameters:

oldRow - the old data

newRow - the new data

session - the session

getRowCount

public long getRowCount(SessionLocal session)

Description copied from class: Index

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

Specified by:

getRowCount in class Index

Parameters:

session - the session

Returns:

the row count

getRowCountApproximation

public long getRowCountApproximation(SessionLocal session)

Description copied from class: Index

Get the approximated row count for this table.

Specified by:

getRowCountApproximation in class Index

Parameters:

session - the session

Returns:

the approximated row count