org.h2.expression.analysis

类 WindowFrame

java.lang.Object

org.h2.expression.analysis.WindowFrame

public final class WindowFrame
extends Object

Window frame clause.

构造器概要

构造器

构造器和说明
WindowFrame(WindowFrameUnits units, WindowFrameBound starting, WindowFrameBound following, WindowFrameExclusion exclusion) Creates new instance of window frame clause.

方法概要

限定符和类型	方法和说明
static int	getEndIndex(Window over, SessionLocal session, ArrayList<Value[]> orderedRows, SortOrder sortOrder, int currentRow) Returns end index for the specified frame, or default end index if frame is null.
WindowFrameExclusion	getExclusion() Returns the exclusion clause.
WindowFrameBound	getFollowing() Returns the following clause.
StringBuilder	getSQL(StringBuilder builder, int formattingFlags) Append SQL representation to the specified builder.
int	getStartIndex(SessionLocal session, ArrayList<Value[]> orderedRows, SortOrder sortOrder, int currentRow) Returns start index of this frame,
WindowFrameBound	getStarting() Returns the starting clause.
WindowFrameUnits	getUnits() Returns the units.
boolean	isValid() Checks validity of this frame.
boolean	isVariableBounds() Check if bounds of this frame has variable expressions.
Iterator<Value[]>	iterator(SessionLocal session, ArrayList<Value[]> orderedRows, SortOrder sortOrder, int currentRow, boolean reverse) Returns iterator.
static Iterator<Value[]>	iterator(Window over, SessionLocal session, ArrayList<Value[]> orderedRows, SortOrder sortOrder, int currentRow, boolean reverse) Returns iterator for the specified frame, or default iterator if frame is null.

从类继承的方法 java.lang.Object

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

构造器详细资料

WindowFrame

public WindowFrame(WindowFrameUnits units,
                   WindowFrameBound starting,
                   WindowFrameBound following,
                   WindowFrameExclusion exclusion)

Creates new instance of window frame clause.

参数:

units - units

starting - starting clause

following - following clause

exclusion - exclusion clause

方法详细资料

iterator

public static Iterator<Value[]> iterator(Window over,
                                         SessionLocal session,
                                         ArrayList<Value[]> orderedRows,
                                         SortOrder sortOrder,
                                         int currentRow,
                                         boolean reverse)

Returns iterator for the specified frame, or default iterator if frame is null.

参数:

over - window

session - the session

orderedRows - ordered rows

sortOrder - sort order

currentRow - index of the current row

reverse - whether iterator should iterate in reverse order

返回:

iterator

getEndIndex

public static int getEndIndex(Window over,
                              SessionLocal session,
                              ArrayList<Value[]> orderedRows,
                              SortOrder sortOrder,
                              int currentRow)

Returns end index for the specified frame, or default end index if frame is null.

参数:

over - window

session - the session

orderedRows - ordered rows

sortOrder - sort order

currentRow - index of the current row

返回:

end index

抛出:

UnsupportedOperationException - if over is not null and its exclusion clause is not EXCLUDE NO OTHERS

getUnits

public WindowFrameUnits getUnits()

Returns the units.

返回:

the units

getStarting

public WindowFrameBound getStarting()

Returns the starting clause.

返回:

the starting clause

getFollowing

public WindowFrameBound getFollowing()

Returns the following clause.

返回:

the following clause, or null

getExclusion

public WindowFrameExclusion getExclusion()

Returns the exclusion clause.

返回:

the exclusion clause

isValid

public boolean isValid()

Checks validity of this frame.

返回:

whether bounds of this frame valid

isVariableBounds

public boolean isVariableBounds()

Check if bounds of this frame has variable expressions. This method may be used only after optimize(SessionLocal) invocation.

返回:

if bounds of this frame has variable expressions

iterator

public Iterator<Value[]> iterator(SessionLocal session,
                                  ArrayList<Value[]> orderedRows,
                                  SortOrder sortOrder,
                                  int currentRow,
                                  boolean reverse)

Returns iterator.

参数:

session - the session

orderedRows - ordered rows

sortOrder - sort order

currentRow - index of the current row

reverse - whether iterator should iterate in reverse order

返回:

iterator

getStartIndex

public int getStartIndex(SessionLocal session,
                         ArrayList<Value[]> orderedRows,
                         SortOrder sortOrder,
                         int currentRow)

Returns start index of this frame,

参数:

session - the session

orderedRows - ordered rows

sortOrder - sort order

currentRow - index of the current row

返回:

start index

抛出:

UnsupportedOperationException - if exclusion clause is not EXCLUDE NO OTHERS

getSQL

public StringBuilder getSQL(StringBuilder builder,
                            int formattingFlags)

Append SQL representation to the specified builder.

参数:

builder - string builder

formattingFlags - quote all identifiers

返回:

the specified string builder

另请参阅:

Expression.getSQL(StringBuilder, int, int)