org.h2.index

类 MetaIndex

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.index.Index

org.h2.index.MetaIndex

所有已实现的接口:

HasSQL

public class MetaIndex
extends Index

The index implementation for meta data tables.

字段概要

从类继承的字段 org.h2.index.Index

columnIds, columns, indexColumns, indexType, table, uniqueColumnColumn

从类继承的字段 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

从接口继承的字段 org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

构造器概要

构造器

构造器和说明
MetaIndex(MetaTable meta, IndexColumn[] columns, boolean scan)

方法概要

限定符和类型	方法和说明
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) Find a row or a list of rows and create a cursor to iterate over the result.
int	getColumnIndex(Column col) Get the index of a column in the list of index columns
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	getDiskSpaceUsed() Get the used disk space for this index.
String	getPlanSQL() Get the message to show in a EXPLAIN statement.
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	isFirstColumn(Column column) Check if the given column is the first for this index
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.

从类继承的方法 org.h2.index.Index

canFindNext, canGetFirstOrLast, canScan, checkIndexColumnTypes, compareRows, findFirstOrLast, findNext, getColumns, getCostRangeIndex, getCreateSQLForCopy, getDuplicateKeyException, getDuplicatePrimaryKeyMessage, getIndexColumns, getIndexType, getRow, getRowFactory, getTable, getType, getUniqueColumnCount, getUniqueRowFactory, isFindUsingFullTableScan, isHidden, isRowIdIndex, mayHaveNullDuplicates, removeChildrenAndResources, update

从类继承的方法 org.h2.schema.SchemaObject

getSchema, getSQL, getSQL

从类继承的方法 org.h2.engine.DbObject

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

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.h2.util.HasSQL

getTraceSQL

构造器详细资料

MetaIndex

public MetaIndex(MetaTable meta,
                 IndexColumn[] columns,
                 boolean scan)

方法详细资料

close

public void close(SessionLocal session)

从类复制的说明: Index

Close this index.

指定者:

close 在类中 Index

参数:

session - the session used to write data

add

public void add(SessionLocal session,
                Row row)

从类复制的说明: Index

Add a row to the index.

指定者:

add 在类中 Index

参数:

session - the session to use

row - the row to add

remove

public void remove(SessionLocal session,
                   Row row)

从类复制的说明: Index

Remove a row from the index.

指定者:

remove 在类中 Index

参数:

session - the session

row - the row

find

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

从类复制的说明: Index

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

指定者:

find 在类中 Index

参数:

session - the session

first - the first row, or null for no limit

last - the last row, or null for no limit

返回:

the cursor to iterate over the results

getCost

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

从类复制的说明: 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.

指定者:

getCost 在类中 Index

参数:

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

返回:

the estimated cost

truncate

public void truncate(SessionLocal session)

从类复制的说明: Index

Remove all rows from the index.

指定者:

truncate 在类中 Index

参数:

session - the session

remove

public void remove(SessionLocal session)

从类复制的说明: Index

Remove the index.

指定者:

remove 在类中 Index

参数:

session - the session

getColumnIndex

public int getColumnIndex(Column col)

从类复制的说明: Index

Get the index of a column in the list of index columns

覆盖:

getColumnIndex 在类中 Index

参数:

col - the column

返回:

the index (0 meaning first column)

isFirstColumn

public boolean isFirstColumn(Column column)

从类复制的说明: Index

Check if the given column is the first for this index

覆盖:

isFirstColumn 在类中 Index

参数:

column - the column

返回:

true if the given columns is the first

checkRename

public void checkRename()

从类复制的说明: DbObject

Check if renaming is allowed. Does nothing when allowed.

覆盖:

checkRename 在类中 DbObject

needRebuild

public boolean needRebuild()

从类复制的说明: Index

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

指定者:

needRebuild 在类中 Index

返回:

true if a rebuild is required.

getCreateSQL

public String getCreateSQL()

从类复制的说明: DbObject

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

覆盖:

getCreateSQL 在类中 Index

返回:

the SQL statement

getRowCount

public long getRowCount(SessionLocal session)

从类复制的说明: Index

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

指定者:

getRowCount 在类中 Index

参数:

session - the session

返回:

the row count

getRowCountApproximation

public long getRowCountApproximation(SessionLocal session)

从类复制的说明: Index

Get the approximated row count for this table.

指定者:

getRowCountApproximation 在类中 Index

参数:

session - the session

返回:

the approximated row count

getDiskSpaceUsed

public long getDiskSpaceUsed()

从类复制的说明: Index

Get the used disk space for this index.

覆盖:

getDiskSpaceUsed 在类中 Index

返回:

the estimated number of bytes

getPlanSQL

public String getPlanSQL()

从类复制的说明: Index

Get the message to show in a EXPLAIN statement.

覆盖:

getPlanSQL 在类中 Index

返回:

the plan