Package org.apache.derby.impl.sql.execute

Class LastIndexKeyResultSet

    • Field Detail

      • conglomId

        protected long conglomId

      • startSearchOperator

        protected int startSearchOperator

      • stopSearchOperator

        protected int stopSearchOperator

      • qualifiers

        protected Qualifier[][] qualifiers

      • userSuppliedOptimizerOverrides

        public java.lang.String userSuppliedOptimizerOverrides

      • runTimeStatisticsOn

        protected boolean runTimeStatisticsOn

      • stopPositionString

        public java.lang.String stopPositionString

      • coarserLock

        public boolean coarserLock

      • returnedRow

        public boolean returnedRow

    • Constructor Detail

      • LastIndexKeyResultSet

        public LastIndexKeyResultSet​(Activation activation,
                             int resultSetNumber,
                             int resultRowTemplate,
                             long conglomId,
                             java.lang.String tableName,
                             java.lang.String userSuppliedOptimizerOverrides,
                             java.lang.String indexName,
                             int colRefItem,
                             int lockMode,
                             boolean tableLocked,
                             int isolationLevel,
                             double optimizerEstimatedRowCount,
                             double optimizerEstimatedCost)
                      throws StandardException
        A last index key result set returns the last row from the index in question. It is used as an ajunct to max().
        Parameters:
        activation - the activation for this result set, which provides the context for the row allocation operation.
        resultSetNumber - The resultSetNumber for the ResultSet
        resultRowTemplate - The saved item for result row template
        conglomId - the conglomerate of the table to be scanned.
        tableName - The full name of the table
        userSuppliedOptimizerOverrides - Overrides specified by the user on the sql
        indexName - The name of the index, if one used to access table.
        colRefItem - An saved item for a bitSet of columns that are referenced in the underlying table. -1 if no item.
        lockMode - The lock granularity to use (see TransactionController in access)
        tableLocked - Whether or not the table is marked as using table locking (in sys.systables)
        isolationLevel - Isolation level (specified or not) to use on scans
        optimizerEstimatedRowCount - Estimated total # of rows by optimizer
        optimizerEstimatedCost - Estimated total cost by optimizer
        Throws:
        StandardException - thrown when unable to create the result set

    • Method Detail

      • canGetInstantaneousLocks

        boolean canGetInstantaneousLocks()
        Can we get instantaneous locks when getting share row locks at READ COMMITTED.
        Specified by:
        canGetInstantaneousLocks in class ScanResultSet

      • openCore

        public void openCore()
              throws StandardException
        open a scan on the table. scan parameters are evaluated at each open, so there is probably some way of altering their values...
        Throws:
        StandardException - thrown on failure to open

      • getTimeSpent

        public long getTimeSpent​(int type)
        Return the total amount of time spent in this ResultSet
        Parameters:
        type - CURRENT_RESULTSET_ONLY - time spent only in this ResultSet ENTIRE_RESULTSET_TREE - time spent in this ResultSet and below.
        Returns:
        long The total amount of time spent (in milliseconds).