org.h2.mvstore.db

类 MVPrimaryIndex

java.lang.Object

org.h2.engine.DbObjectBase

org.h2.schema.SchemaObjectBase

org.h2.index.BaseIndex

org.h2.mvstore.db.MVPrimaryIndex

所有已实现的接口:

DbObject, Index, SchemaObject

public class MVPrimaryIndex
extends BaseIndex

A table stored in a MVStore.

字段概要

从类继承的字段 org.h2.index.BaseIndex

columnIds, columns, indexColumns, indexType, isMultiVersion, table

从类继承的字段 org.h2.engine.DbObjectBase

comment, database, trace

从接口继承的字段 org.h2.engine.DbObject

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

构造器概要

构造器

构造器和说明
MVPrimaryIndex(Database db, MVTable table, int id, IndexColumn[] columns, IndexType indexType)

方法概要

限定符和类型	方法和说明
void	add(Session session, Row row) Add a row to the index.
boolean	canGetFirstOrLast() Check if the index can directly look up the lowest or highest value of a column.
void	checkRename() Check if this object can be renamed.
void	close(Session session) Close this 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.
Cursor	findFirstOrLast(Session session, boolean first) Find the first (or last) value of this index.
int	getColumnIndex(Column col) Get the index of a column in the list of index columns
double	getCost(Session session, int[] masks, TableFilter[] filters, int filter, SortOrder sortOrder, HashSet<Column> allColumnsSet) Estimate the cost to search for rows given the search mask.
String	getCreateSQL() Build a SQL statement to re-create this object.
long	getDiskSpaceUsed() Get the used disk space for this index.
int	getMainIndexColumn()
String	getMapName()
String	getPlanSQL() Get the message to show in a EXPLAIN statement.
Row	getRow(Session session, long key) Get the row with the given key.
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.
long	getRowCountMax() The maximum number of rows, including uncommitted rows of any session.
MVTable	getTable() Get the table on which this index is based.
boolean	isRowIdIndex() Does this index support lookup by row id?
boolean	needRebuild() Check if the index needs to be rebuilt.
void	remove(Session session) Remove the index.
void	remove(Session session, Row row) Remove a row from the index.
void	setMainIndexColumn(int mainIndexColumn)
void	truncate(Session session) Remove all rows from the index.

从类继承的方法 org.h2.index.BaseIndex

canFindNext, canScan, checkIndexColumnTypes, commit, compareRows, containsNullAndAllowMultipleNull, createLookupBatch, find, findNext, getColumns, getCostRangeIndex, getCreateSQLForCopy, getDropSQL, getDuplicateKeyException, getIndexColumns, getIndexType, getType, initBaseIndex, isHidden, removeChildrenAndResources, setSortedInsertMode

从类继承的方法 org.h2.schema.SchemaObjectBase

getSchema, getSQL, initSchemaObjectBase

从类继承的方法 org.h2.engine.DbObjectBase

getChildren, getComment, getDatabase, getId, getModificationId, getName, initDbObjectBase, 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.schema.SchemaObject

getSchema

从接口继承的方法 org.h2.engine.DbObject

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

构造器详细资料

MVPrimaryIndex

public MVPrimaryIndex(Database db,
                      MVTable table,
                      int id,
                      IndexColumn[] columns,
                      IndexType indexType)

方法详细资料

getCreateSQL

public String getCreateSQL()

从类复制的说明: DbObjectBase

Build a SQL statement to re-create this object.

指定者:

getCreateSQL 在接口中 DbObject

覆盖:

getCreateSQL 在类中 BaseIndex

返回:

the SQL statement

getPlanSQL

public String getPlanSQL()

从接口复制的说明: Index

Get the message to show in a EXPLAIN statement.

指定者:

getPlanSQL 在接口中 Index

覆盖:

getPlanSQL 在类中 BaseIndex

返回:

the plan

setMainIndexColumn

public void setMainIndexColumn(int mainIndexColumn)

getMainIndexColumn

public int getMainIndexColumn()

close

public void close(Session session)

从接口复制的说明: Index

Close this index.

参数:

session - the session used to write data

add

public void add(Session session,
                Row row)

从接口复制的说明: Index

Add a row to the index.

参数:

session - the session to use

row - the row to add

remove

public void remove(Session session,
                   Row row)

从接口复制的说明: Index

Remove a row from the index.

参数:

session - the session

row - the row

find

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

从接口复制的说明: Index

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

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

getTable

public MVTable getTable()

从接口复制的说明: Index

Get the table on which this index is based.

指定者:

getTable 在接口中 Index

覆盖:

getTable 在类中 BaseIndex

返回:

the table

getRow

public Row getRow(Session session,
                  long key)

从接口复制的说明: Index

Get the row with the given key.

指定者:

getRow 在接口中 Index

覆盖:

getRow 在类中 BaseIndex

参数:

session - the session

key - the unique key

返回:

the row

getCost

public double getCost(Session session,
                      int[] masks,
                      TableFilter[] filters,
                      int filter,
                      SortOrder sortOrder,
                      HashSet<Column> allColumnsSet)

从接口复制的说明: 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.

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

getColumnIndex

public int getColumnIndex(Column col)

从接口复制的说明: Index

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

指定者:

getColumnIndex 在接口中 Index

覆盖:

getColumnIndex 在类中 BaseIndex

参数:

col - the column

返回:

the index (0 meaning first column)

remove

public void remove(Session session)

从接口复制的说明: Index

Remove the index.

参数:

session - the session

truncate

public void truncate(Session session)

从接口复制的说明: Index

Remove all rows from the index.

参数:

session - the session

canGetFirstOrLast

public boolean canGetFirstOrLast()

从接口复制的说明: Index

Check if the index can directly look up the lowest or highest value of a column.

返回:

true if it can

findFirstOrLast

public Cursor findFirstOrLast(Session session,
                              boolean first)

从接口复制的说明: Index

Find the first (or last) value of this index. The cursor returned is positioned on the correct row, or on null if no row has been found.

参数:

session - the session

first - true if the first (lowest for ascending indexes) or last value should be returned

返回:

a cursor (never null)

needRebuild

public boolean needRebuild()

从接口复制的说明: Index

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

返回:

true if a rebuild is required.

getRowCount

public long getRowCount(Session session)

从接口复制的说明: Index

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

参数:

session - the session

返回:

the row count

getRowCountMax

public long getRowCountMax()

The maximum number of rows, including uncommitted rows of any session.

返回:

the maximum number of rows

getRowCountApproximation

public long getRowCountApproximation()

从接口复制的说明: Index

Get the approximated row count for this table.

返回:

the approximated row count

getDiskSpaceUsed

public long getDiskSpaceUsed()

从接口复制的说明: Index

Get the used disk space for this index.

返回:

the estimated number of bytes

getMapName

public String getMapName()

checkRename

public void checkRename()

从类复制的说明: DbObjectBase

Check if this object can be renamed. System objects may not be renamed.

指定者:

checkRename 在接口中 DbObject

指定者:

checkRename 在类中 DbObjectBase

isRowIdIndex

public boolean isRowIdIndex()

从接口复制的说明: Index

Does this index support lookup by row id?

指定者:

isRowIdIndex 在接口中 Index

覆盖:

isRowIdIndex 在类中 BaseIndex

返回:

true if it does