Package org.apache.derby.iapi.sql.execute

Interface NoPutResultSet

    • Method Detail

      • markAsTopResultSet

        void markAsTopResultSet()
        Mark the ResultSet as the topmost one in the ResultSet tree. Useful for closing down the ResultSet on an error.

      • openCore

        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...

        openCore() can only be called on a closed result set. see reopenCore if you want to reuse an open result set.

        For NoPutResultSet open() must only be called on the top ResultSet. Opening of NoPutResultSet's below the top result set are implemented by calling openCore.

        Throws:
        StandardException - thrown if cursor finished.

      • reopenCore

        void reopenCore()
         throws StandardException
        reopen the scan. behaves like openCore() but is optimized where appropriate (e.g. where scanController has special logic for us).

        used by joiners

        scan parameters are evaluated at each open, so there is probably some way of altering their values...

        Throws:
        StandardException - thrown if cursor finished.

      • getNextRowCore

        ExecRow getNextRowCore()
                throws StandardException
        Return the requested values computed from the next row (if any) for which the restriction evaluates to true.

        restriction and projection parameters are evaluated for each row.

        Returns:
        the next row in the result
        Throws:
        StandardException - thrown on failure.

      • getPointOfAttachment

        int getPointOfAttachment()
        Return the point of attachment for this subquery. (Only meaningful for Any and Once ResultSets, which can and will only be at the top of a ResultSet for a subquery.)
        Returns:
        int Point of attachment (result set number) for this subquery. (-1 if not a subquery - also Sanity violation)

      • getScanIsolationLevel

        int getScanIsolationLevel()
        Return the isolation level of the scan in the result set. Only expected to be called for those ResultSets that contain a scan.
        Returns:
        The isolation level of the scan (in TransactionController constants).

      • setTargetResultSet

        void setTargetResultSet​(TargetResultSet trs)
        Notify a NPRS that it is the source for the specified TargetResultSet. This is useful when doing bulk insert.
        Parameters:
        trs - The TargetResultSet.

      • setNeedsRowLocation

        void setNeedsRowLocation​(boolean needsRowLocation)
        Set whether or not the NPRS need the row location when acting as a row source. (The target result set determines this.)

      • setHasDeferrableChecks

        void setHasDeferrableChecks()
        Set that we are acting on behalf of an insert result set that has deferrable check constraints

      • getEstimatedRowCount

        double getEstimatedRowCount()
        Get the estimated row count from this result set.
        Returns:
        The estimated row count (as a double) from this result set.

      • resultSetNumber

        int resultSetNumber()
        Get the number of this ResultSet, which is guaranteed to be unique within a statement.

      • setCurrentRow

        void setCurrentRow​(ExecRow row)
        Set the current row to the row passed in.
        Parameters:
        row - the new current row

      • requiresRelocking

        boolean requiresRelocking()
        Do we need to relock the row when going to the heap.
        Returns:
        Whether or not we need to relock the row when going to the heap.

      • isForUpdate

        boolean isForUpdate()
        Is this ResultSet or it's source result set for update
        Returns:
        Whether or not the result set is for update.

      • updateRow

        void updateRow​(ExecRow row,
               RowChanger rowChanger)
        throws StandardException
        Updates the resultSet's current row with it's new values after an update has been issued either using positioned update or JDBC's udpateRow method.
        Parameters:
        row - new values for the currentRow
        rowChanger - holds information about row: what columns of it is to be used for updating, and what underlying base table column each such column corresponds to.
        Throws:
        StandardException - thrown on failure.

      • markRowAsDeleted

        void markRowAsDeleted()
               throws StandardException
        Marks the resultSet's currentRow as deleted after a delete has been issued by either by using positioned delete or JDBC's deleteRow method.
        Throws:
        StandardException - thrown on failure.

      • positionScanAtRowLocation

        void positionScanAtRowLocation​(RowLocation rLoc)
                        throws StandardException
        Positions the cursor in the specified rowLocation. Used for scrollable insensitive result sets in order to position the cursor back to a row that has already be visited.
        Parameters:
        rLoc - row location of the current cursor row
        Throws:
        StandardException - thrown on failure to get location from storage engine