Class BackingStoreHashTableFromScan

java.lang.Object
org.apache.derby.iapi.store.access.BackingStoreHashtable
org.apache.derby.impl.store.access.BackingStoreHashTableFromScan

class BackingStoreHashTableFromScan extends BackingStoreHashtable
Extend BackingStoreHashtable with the ability to maintain the underlying openScan() until the hashtable has been closed. This is necessary for long row access. Access to long row delays actual objectification until the columns are accessed, but depends on the underlying table to be still open when the column is accessed.

Transactions are obtained from an AccessFactory.

See Also:
  • Field Details

    • open_scan

      private ScanManager open_scan
      Fields of the class
    • includeRowLocations

      private boolean includeRowLocations
  • Constructor Details

    • BackingStoreHashTableFromScan

      public BackingStoreHashTableFromScan(TransactionController tc, long conglomId, int open_mode, int lock_level, int isolation_level, FormatableBitSet scanColumnList, DataValueDescriptor[] startKeyValue, int startSearchOperator, Qualifier[][] qualifier, DataValueDescriptor[] stopKeyValue, int stopSearchOperator, long max_rowcnt, int[] key_column_numbers, boolean remove_duplicates, long estimated_rowcnt, long max_inmemory_rowcnt, int initialCapacity, float loadFactor, boolean collect_runtimestats, boolean skipNullKeyColumns, boolean keepAfterCommit, boolean includeRowLocations) throws StandardException
      Constructors for This class:
      Throws:
      StandardException
  • Method Details

    • includeRowLocations

      public boolean includeRowLocations()
      Public Methods of This class:
      Overrides:
      includeRowLocations in class BackingStoreHashtable
    • close

      public void close() throws StandardException
      Close the BackingStoreHashtable.

      Perform any necessary cleanup after finishing with the hashtable. Will deallocate/dereference objects as necessary. If the table has gone to disk this will drop any on disk files used to support the hash table.

      Overrides:
      close in class BackingStoreHashtable
      Throws:
      StandardException - Standard exception policy.