org.apache.calcite.avatica.util

Interface Cursor

All Superinterfaces:

AutoCloseable

All Known Implementing Classes:

AbstractCursor, ArrayIteratorCursor, IteratorCursor, ListIteratorCursor, MapIteratorCursor, PositionedCursor, RecordIteratorCursor

public interface Cursor
extends AutoCloseable

Interface to an iteration that is similar to, and can easily support, a JDBC ResultSet, but is simpler to implement.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Cursor.Accessor Accessor of a column value.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this cursor and releases resources.
List<Cursor.Accessor>	createAccessors(List<ColumnMetaData> types, Calendar localCalendar, ArrayImpl.Factory factory) Creates a list of accessors, one per column.
boolean	next() Moves to the next row.
boolean	wasNull() Returns whether the last value returned was null.

Method Detail

createAccessors

List<Cursor.Accessor> createAccessors(List<ColumnMetaData> types,
                                      Calendar localCalendar,
                                      ArrayImpl.Factory factory)

Creates a list of accessors, one per column.

Parameters:

types - List of column types, per Types.

localCalendar - Calendar in local time zone

factory - Factory that creates sub-ResultSets when needed

Returns:

List of column accessors

next

boolean next()
      throws SQLException

Moves to the next row.

Returns:

Whether moved

Throws:

SQLException - on database error

close

void close()

Closes this cursor and releases resources.

Specified by:

close in interface AutoCloseable

wasNull

boolean wasNull()
         throws SQLException

Returns whether the last value returned was null.

Throws:

SQLException - on database error