Interface ResultIterator<T>

All Superinterfaces:
AutoCloseable, Iterable<T>
All Known Implementing Classes:
ConnectionAwareResultIterator, DistinctResultIterator, JDBCResultIterator, LimitResultIterator

public interface ResultIterator<T>
extends Iterable<T>, AutoCloseable
Defines API of an iterator over the records returned as a result of Select queries execution. Usually a ResultIterator is supported by an open java.sql.ResultSet, therefore ResultIterators must be explicitly closed when the user is done working with them. An alternative to that is ObjectContext.iterate(org.apache.cayenne.query.Select, ResultIteratorCallback) method that handles resource management.
Since:
3.0
  • Method Summary

    Modifier and Type Method Description
    List<T> allRows()
    Returns all yet unread rows from ResultSet without closing it.
    void close()
    Closes ResultIterator and associated ResultSet.
    boolean hasNextRow()
    Returns true if there is at least one more record that can be read from the iterator.
    T nextRow()
    Returns the next result row that is, depending on the query, may be a scalar value, a DataRow, or an Object[] array containing a mix of scalars and DataRows.
    void skipRow()
    Goes past current row.

    Methods inherited from interface java.lang.Iterable

    forEach, iterator, spliterator
  • Method Details

    • allRows

      List<T> allRows()
      Returns all yet unread rows from ResultSet without closing it.
      Since:
      3.0
    • hasNextRow

      boolean hasNextRow()
      Returns true if there is at least one more record that can be read from the iterator.
    • nextRow

      T nextRow()
      Returns the next result row that is, depending on the query, may be a scalar value, a DataRow, or an Object[] array containing a mix of scalars and DataRows.
      Since:
      3.0
    • skipRow

      void skipRow()
      Goes past current row. If the row is not needed, this may save some time on data conversion.
      Since:
      3.0
    • close

      void close()
      Closes ResultIterator and associated ResultSet. This method must be called explicitly when the user is finished processing the records. Otherwise unused database resources will not be released properly.
      Specified by:
      close in interface AutoCloseable