xxl.relational
Class NestedLoopsMinus

java.lang.Object
  |
  +--xxl.relational.AbstractResultSet
        |
        +--xxl.relational.Minus
              |
              +--xxl.relational.NestedLoopsMinus
public class NestedLoopsMinus
extends Minus

Nested-loops implementation of the operator "Minus".

Example: 


	new NestedLoopsMinus(bag, 1024, r1, r2);
computes "(select * from r1) minus (select * from r2)". Therewhile only 1024 tuples are in main memory at one time and all other tuple, which must be stored, will be stored in the given bag.

Field Summary
protected  boolean aNext
           
protected  boolean bIsEmpty
           
protected  boolean bNext
           
protected  Bag innerBag
           
protected  java.util.HashSet outerBag
           
protected  java.util.Iterator outerBagIterator
           
protected  int outerBagSize
           
protected  Tuple t
           
protected  boolean wasNull
           
 
Fields inherited from class xxl.relational.Minus
a, b
 
Constructor Summary
NestedLoopsMinus(Bag innerBag, int outerBagSize, java.sql.ResultSet a, java.sql.ResultSet b)
           
 
Method Summary
 void close()
           
 byte[] getBytes(int columnIndex)
           
 java.lang.Object getObject(int columnIndex)
           
 boolean next()
           
 boolean wasNull()
           
 
Methods inherited from class xxl.relational.Minus
findColumn, getMetaData
 
Methods inherited from class xxl.relational.AbstractResultSet
absolute, afterLast, beforeFirst, cancelRowUpdates, clearWarnings, deleteRow, first, getArray, getArray, getAsciiStream, getAsciiStream, getBigDecimal, getBigDecimal, getBigDecimal, getBigDecimal, getBinaryStream, getBinaryStream, getBlob, getBlob, getBoolean, getBoolean, getByte, getByte, getBytes, getCharacterStream, getCharacterStream, getClob, getClob, getColumnCount, getConcurrency, getCursorName, getDate, getDate, getDate, getDate, getDouble, getDouble, getFetchDirection, getFetchSize, getFloat, getFloat, getInt, getInt, getLong, getLong, getObject, getObject, getObject, getRef, getRef, getRow, getShort, getShort, getStatement, getString, getString, getTime, getTime, getTime, getTime, getTimestamp, getTimestamp, getTimestamp, getTimestamp, getType, getUnicodeStream, getUnicodeStream, getWarnings, insertRow, isAfterLast, isBeforeFirst, isFirst, isLast, last, moveToCurrentRow, moveToInsertRow, previous, refreshRow, relative, rowDeleted, rowInserted, rowUpdated, setFetchDirection, setFetchSize, updateAsciiStream, updateAsciiStream, updateBigDecimal, updateBigDecimal, updateBinaryStream, updateBinaryStream, updateBoolean, updateBoolean, updateByte, updateByte, updateBytes, updateBytes, updateCharacterStream, updateCharacterStream, updateDate, updateDate, updateDouble, updateDouble, updateFloat, updateFloat, updateInt, updateInt, updateLong, updateLong, updateNull, updateNull, updateObject, updateObject, updateObject, updateObject, updateRow, updateShort, updateShort, updateString, updateString, updateTime, updateTime, updateTimestamp, updateTimestamp
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

innerBag

protected Bag innerBag

outerBag

protected java.util.HashSet outerBag

outerBagSize

protected int outerBagSize

outerBagIterator

protected java.util.Iterator outerBagIterator

t

protected Tuple t

bIsEmpty

protected boolean bIsEmpty

aNext

protected boolean aNext

bNext

protected boolean bNext

wasNull

protected boolean wasNull
Constructor Detail

NestedLoopsMinus

public NestedLoopsMinus(Bag innerBag,
                        int outerBagSize,
                        java.sql.ResultSet a,
                        java.sql.ResultSet b)
Method Detail

next

public boolean next()
             throws java.sql.SQLException
Overrides:
next in class Minus

getObject

public java.lang.Object getObject(int columnIndex)
                           throws java.sql.SQLException
Overrides:
getObject in class Minus

getBytes

public byte[] getBytes(int columnIndex)
                throws java.sql.SQLException
Overrides:
getBytes in class Minus

wasNull

public boolean wasNull()
                throws java.sql.SQLException
Overrides:
wasNull in class Minus

close

public void close()
           throws java.sql.SQLException
Overrides:
close in class Minus