Package org.h2.index

Class IndexCursor

java.lang.Object
org.h2.index.IndexCursor
All Implemented Interfaces:
Cursor
public class IndexCursor extends Object implements Cursor
The filter used to walk through an index. This class supports IN(..) and IN(SELECT ...) optimizations.

  • Constructor Details

    • IndexCursor

      public IndexCursor()

  • Method Details

    • setIndex

      public void setIndex(Index index, boolean reverse)

    • prepare

      public void prepare(SessionLocal s, ArrayList<IndexCondition> indexConditions)
      Prepare this index cursor to make a lookup in index.
      Parameters:
      s - Session.
      indexConditions - Index conditions.

    • find

      public void find(SessionLocal s, ArrayList<IndexCondition> indexConditions)
      Re-evaluate the start and end values of the index search for rows.
      Parameters:
      s - the session
      indexConditions - the index conditions

    • canUseIndexForIn

      public static boolean canUseIndexForIn(Index index, Column[] columns)
      Return true if Index.getIndexColumns() and the columns parameter contains the same elements in the same order. All column of the index must match the column in the columns array, or it must be a VIEW index (where the column is null).
      See Also:

    • isAlwaysFalse

      public boolean isAlwaysFalse()
      Check if the result is empty for sure.
      Returns:
      true if it is

    • getStart

      public SearchRow getStart()
      Get start search row.
      Returns:
      search row

    • getEnd

      public SearchRow getEnd()
      Get end search row.
      Returns:
      search row

    • get

      public Row get()
      Description copied from interface: Cursor
      Get the complete current row. All column are available.
      Specified by:
      get in interface Cursor
      Returns:
      the complete row

    • getSearchRow

      public SearchRow getSearchRow()
      Description copied from interface: Cursor
      Get the current row. Only the data for indexed columns is available in this row.
      Specified by:
      getSearchRow in interface Cursor
      Returns:
      the search row

    • next

      public boolean next()
      Description copied from interface: Cursor
      Skip to the next row if one is available.
      Specified by:
      next in interface Cursor
      Returns:
      true if another row is available

    • previous

      public boolean previous()
      Description copied from interface: Cursor
      Skip to the previous row if one is available. No filtering is made here.
      Specified by:
      previous in interface Cursor
      Returns:
      true if another row is available