Package org.h2.index

Class QueryExpressionIndex

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.index.Index

org.h2.index.QueryExpressionIndex

All Implemented Interfaces:

HasSQL

Direct Known Subclasses:

RecursiveIndex, RegularQueryExpressionIndex

public abstract class QueryExpressionIndex
extends Index

This object represents a virtual index for a query expression.

Field Summary

Fields inherited from class org.h2.index.Index

columnIds, columns, indexColumns, indexType, 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

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.
java.lang.String	getPlanSQL()	Get the message to show in a EXPLAIN statement.
Query	getQuery()
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.
abstract boolean	isExpired()
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.

Methods inherited from class org.h2.index.Index

areRowsEquivalent, canFindNext, canGetFirstOrLast, canScan, checkIndexColumnTypes, compareRows, find, findFirstOrLast, findNext, getColumnIndex, getColumns, getCost, getCostRangeIndex, getCreateSQL, getCreateSQLForCopy, getDiskSpaceUsed, getDuplicateKeyException, getDuplicatePrimaryKeyMessage, getIndexColumns, getIndexType, 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

equals, getChildren, getComment, getCreateSQLForMeta, getDatabase, getDropSQL, getId, getModificationId, getName, hashCode, invalidate, isTemporary, isValid, rename, setComment, setModified, setObjectName, setTemporary, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL

getTraceSQL

Method Detail

isExpired

public abstract boolean isExpired()

getPlanSQL

public java.lang.String getPlanSQL()

Description copied from class: Index

Get the message to show in a EXPLAIN statement.

Overrides:

getPlanSQL in class Index

Returns:

the plan

getQuery

public Query getQuery()

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

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

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.

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