MVDelegateIndex (H2 Database Engine wt-1.0.1 API)

java.lang.Object
- org.h2.engine.DbObjectBase
- - org.h2.schema.SchemaObjectBase
  - - org.h2.index.BaseIndex
    - - org.h2.mvstore.db.MVDelegateIndex

所有已实现的接口:

DbObject, Index, MVIndex, SchemaObject
```
public class MVDelegateIndex
extends BaseIndex
implements MVIndex
```
An index that delegates indexing to another index.

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
`MVDelegateIndex(MVTable table, int id, String name, MVPrimaryIndex mainIndex, IndexType indexType)`

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`void`	`add(Session session, Row row)` Add a row to the index.
`void`	`addBufferedRows(List<String> bufferNames)` Add all the index data from the buffers to the index.
`void`	`addRowsToBuffer(List<Row> rows, String bufferName)` Add the rows to a temporary storage (not to the index yet).
`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.
`long`	`getDiskSpaceUsed()` Get the used disk space for this index.
`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.
`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`	`truncate(Session session)` Remove all rows from the index.

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.index.Index
canFindNext, canScan, commit, compareRows, createLookupBatch, find, findNext, getColumns, getIndexColumns, getIndexType, getPlanSQL, getRow, getTable, isRowIdIndex, setSortedInsertMode

从接口继承的方法 org.h2.schema.SchemaObject
getSchema, isHidden

从接口继承的方法 org.h2.engine.DbObject
getChildren, getComment, getCreateSQL, getCreateSQLForCopy, getDatabase, getDropSQL, getId, getName, getSQL, getType, isTemporary, removeChildrenAndResources, rename, setComment, setTemporary

- 构造器详细资料
  - MVDelegateIndex
```
public MVDelegateIndex(MVTable table,
                       int id,
                       String name,
                       MVPrimaryIndex mainIndex,
                       IndexType indexType)
```
- 方法详细资料
  - addRowsToBuffer
```
public void addRowsToBuffer(List<Row> rows,
                            String bufferName)
```
    从接口复制的说明: MVIndex
    
    Add the rows to a temporary storage (not to the index yet). The rows are sorted by the index columns. This is to more quickly build the index.
    
    指定者:
    
    addRowsToBuffer 在接口中 MVIndex
    
    参数:
    
    rows - the rows
    
    bufferName - the name of the temporary storage
  - addBufferedRows
```
public void addBufferedRows(List<String> bufferNames)
```
    从接口复制的说明: MVIndex
    
    Add all the index data from the buffers to the index. The index will typically use merge sort to add the data more quickly in sorted order.
    
    指定者:
    
    addBufferedRows 在接口中 MVIndex
    
    参数:
    
    bufferNames - the names of the temporary storage
  - add
```
public void add(Session session,
                Row row)
```
    从接口复制的说明: Index
    
    Add a row to the index.
    
    指定者:
    
    add 在接口中 Index
    
    参数:
    
    session - the session to use
    
    row - the row to add
  - 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.
    
    指定者:
    
    canGetFirstOrLast 在接口中 Index
    
    返回:
    
    true if it can
  - close
```
public void close(Session session)
```
    从接口复制的说明: Index
    
    Close this index.
    
    指定者:
    
    close 在接口中 Index
    
    参数:
    
    session - the session used to write data
  - 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.
    
    指定者:
    
    find 在接口中 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
  - 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.
    
    指定者:
    
    findFirstOrLast 在接口中 Index
    
    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)
  - 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)
  - 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.
    
    指定者:
    
    getCost 在接口中 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
  - 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.
    
    指定者:
    
    needRebuild 在接口中 Index
    
    返回:
    
    true if a rebuild is required.
  - remove
```
public void remove(Session session,
                   Row row)
```
    从接口复制的说明: Index
    
    Remove a row from the index.
    
    指定者:
    
    remove 在接口中 Index
    
    参数:
    
    session - the session
    
    row - the row
  - remove
```
public void remove(Session session)
```
    从接口复制的说明: Index
    
    Remove the index.
    
    指定者:
    
    remove 在接口中 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.
    
    指定者:
    
    truncate 在接口中 Index
    
    参数:
    
    session - the session
  - 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
  - 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.
    
    指定者:
    
    getRowCount 在接口中 Index
    
    参数:
    
    session - the session
    
    返回:
    
    the row count
  - getRowCountApproximation
```
public long getRowCountApproximation()
```
    从接口复制的说明: Index
    
    Get the approximated row count for this table.
    
    指定者:
    
    getRowCountApproximation 在接口中 Index
    
    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.
    
    指定者:
    
    getDiskSpaceUsed 在接口中 Index
    
    返回:
    
    the estimated number of bytes

类 MVDelegateIndex

字段概要

从类继承的字段 org.h2.index.BaseIndex

从类继承的字段 org.h2.engine.DbObjectBase

从接口继承的字段 org.h2.engine.DbObject

构造器概要

方法概要

从类继承的方法 org.h2.index.BaseIndex

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

从类继承的方法 org.h2.engine.DbObjectBase

从类继承的方法 java.lang.Object

从接口继承的方法 org.h2.index.Index

从接口继承的方法 org.h2.schema.SchemaObject

从接口继承的方法 org.h2.engine.DbObject

构造器详细资料

MVDelegateIndex

方法详细资料

addRowsToBuffer

addBufferedRows

add

canGetFirstOrLast

close

find

findFirstOrLast

getColumnIndex

getCost

needRebuild

remove

remove

truncate

checkRename

getRowCount

getRowCountApproximation

getDiskSpaceUsed