org.h2.index

类 VirtualConstructedTableIndex

java.lang.Object

org.h2.engine.DbObject

org.h2.schema.SchemaObject

org.h2.index.Index

org.h2.index.VirtualTableIndex

org.h2.index.VirtualConstructedTableIndex

所有已实现的接口:

HasSQL

public class VirtualConstructedTableIndex
extends VirtualTableIndex

An index for a virtual table that returns a result set. Search in this index performs scan over all rows and should be avoided.

字段概要

从类继承的字段 org.h2.index.Index

columnIds, columns, indexColumns, indexType, 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
VirtualConstructedTableIndex(VirtualConstructedTable table, IndexColumn[] columns)

方法概要

限定符和类型	方法和说明
boolean	canScan() Can this index iterate over all rows?
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.
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	getPlanSQL() Get the message to show in a EXPLAIN statement.
boolean	isFindUsingFullTableScan() Returns true if find() implementation performs scan over all index, false if find() performs the fast lookup.

从类继承的方法 org.h2.index.VirtualTableIndex

add, checkRename, close, getRowCount, getRowCountApproximation, needRebuild, remove, remove, truncate

从类继承的方法 org.h2.index.Index

canFindNext, canGetFirstOrLast, checkIndexColumnTypes, compareRows, findFirstOrLast, findNext, getColumnIndex, getColumns, getCostRangeIndex, getCreateSQL, getCreateSQLForCopy, getDiskSpaceUsed, getDuplicateKeyException, getDuplicatePrimaryKeyMessage, getIndexColumns, getIndexType, getRow, getRowFactory, getTable, getType, getUniqueColumnCount, getUniqueRowFactory, isFirstColumn, 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

VirtualConstructedTableIndex

public VirtualConstructedTableIndex(VirtualConstructedTable table,
                                    IndexColumn[] columns)

方法详细资料

isFindUsingFullTableScan

public boolean isFindUsingFullTableScan()

从类复制的说明: Index

Returns true if find() implementation performs scan over all index, false if find() performs the fast lookup.

覆盖:

isFindUsingFullTableScan 在类中 Index

返回:

true if find() implementation performs scan over all index, false if find() performs the fast lookup

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

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

canScan

public boolean canScan()

从类复制的说明: Index

Can this index iterate over all rows?

覆盖:

canScan 在类中 Index

返回:

true if it can