public class BTreeForwardScan extends BTreeScan
Concurrency Notes
The concurrency rules are derived from OpenBTree.
OpenBTree
fetchNext_one_slot_array, init_fetchDesc, init_forUpdate, init_hold, init_lock_fetch_desc, init_qualifier, init_rawtran, init_scanColumnList, init_startKeyValue, init_startSearchOperator, init_stopKeyValue, init_stopSearchOperator, init_template, init_useUpdateLocks, lock_operation, SCAN_DONE, SCAN_HOLD_INIT, SCAN_HOLD_INPROGRESS, SCAN_INIT, SCAN_INPROGRESS, scan_position, scan_state, stat_numdeleted_rows_visited, stat_numpages_visited, stat_numrows_qualified, stat_numrows_visited
btree_undo, container, err_containerid, init_lock_level, init_open_user_scans, runtime_mem
GE, GT, NA
Constructor and Description |
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BTreeForwardScan() |
Modifier and Type | Method and Description |
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protected int |
fetchRows(BTreeRowPosition pos,
DataValueDescriptor[][] row_array,
RowLocation[] rowloc_array,
BackingStoreHashtable hash_table,
long max_rowcnt,
int[] key_column_numbers)
Fetch the next N rows from the table.
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protected void |
positionAtStartPosition(BTreeRowPosition pos)
Position scan at "start" position.
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close, closeForEndTransaction, delete, didNotQualify, doesCurrentPositionQualify, fetch, fetchLocation, fetchNext, fetchNextGroup, fetchNextGroup, fetchSet, fetchWithoutQualify, getCurrentRecordHandleForDebugging, getScanInfo, init, isCurrentPositionDeleted, isEmpty, isHeldAfterCommit, isKeyed, newRowLocationTemplate, next, positionAtDoneScan, positionAtDoneScanFromClose, positionAtNextPage, positionAtPreviousPage, positionAtRowLocation, positionAtStartForForwardScan, process_qualifier, reopenScan, reopenScanByRowLocation, replace, reposition, savePositionAndReleasePage, savePositionAndReleasePage, toString
checkConsistency, debugConglomerate, getColumnSortOrderInfo, getConglomerate, getContainer, getContainerHandle, getEstimatedRowCount, getHeight, getHold, getLockingPolicy, getLockLevel, getOpenMode, getRawTran, getRuntimeMem, getSpaceInfo, getXactMgr, init, isClosed, isIndexableRowConsistent, isTableLocked, reopen, setEstimatedRowCount, setLockingPolicy, test_errors
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
isTableLocked
getEstimatedRowCount, setEstimatedRowCount
protected void positionAtStartPosition(BTreeRowPosition pos) throws StandardException
Positions the scan to the slot just before the first record to be returned from the scan. Returns the start page latched, and sets "current_slot" to the slot number.
positionAtStartPosition
in class BTreeScan
StandardException
- Standard exception policy.protected int fetchRows(BTreeRowPosition pos, DataValueDescriptor[][] row_array, RowLocation[] rowloc_array, BackingStoreHashtable hash_table, long max_rowcnt, int[] key_column_numbers) throws StandardException
Utility routine used by both fetchSet() and fetchNextGroup().
fetchRows
in class BTreeScan
StandardException
- Standard exception policy.Apache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.