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java.lang.Objectorg.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl
org.apache.derby.impl.sql.execute.NoPutResultSetImpl
org.apache.derby.impl.sql.execute.TableScanResultSet
org.apache.derby.impl.sql.execute.BulkTableScanResultSet
Read a base table or index in bulk. Most of the work for this method is inherited from TableScanResultSet. This class overrides getNextRowCore (and extends re/openCore) to use a row array and fetch rows from the Store in bulk (using fetchNextGroup).
Since it retrieves rows in bulk, locking is not as is usual -- locks may have already been released on rows as they are returned to the user. Hence, this ResultSet is not suitable for a query running Isolation Level 1, cursor stability.
Note that this code is only accessable from an optimizer override. If it makes sense to have the optimizer select bulk reads, then this should probably be rolled into TableScanResultSet.
Field Summary | |
private int |
curRowPosition
|
private int |
numRowsInArray
|
private static int |
OUT_OF_ROWS
|
private DataValueDescriptor[][] |
rowArray
|
Fields inherited from interface org.apache.derby.iapi.sql.ResultSet |
CURRENT_RESULTSET_ONLY, ENTIRE_RESULTSET_TREE, ISAFTERLAST, ISBEFOREFIRST, ISFIRST, ISLAST |
Fields inherited from interface org.apache.derby.iapi.sql.execute.NoPutResultSet |
ABSOLUTE, FIRST, LAST, NEXT, PREVIOUS, RELATIVE |
Constructor Summary | |
BulkTableScanResultSet(long conglomId,
StaticCompiledOpenConglomInfo scoci,
Activation activation,
GeneratedMethod resultRowAllocator,
int resultSetNumber,
GeneratedMethod startKeyGetter,
int startSearchOperator,
GeneratedMethod stopKeyGetter,
int stopSearchOperator,
boolean sameStartStopPosition,
Qualifier[][] qualifiers,
java.lang.String tableName,
java.lang.String indexName,
boolean isConstraint,
boolean forUpdate,
int colRefItem,
int indexColItem,
int lockMode,
boolean tableLocked,
int isolationLevel,
int rowsPerRead,
boolean oneRowScan,
double optimizerEstimatedRowCount,
double optimizerEstimatedCost,
GeneratedMethod closeCleanup)
Constructor. |
Method Summary | |
protected boolean |
canGetInstantaneousLocks()
Can we get instantaneous locks when getting share row locks at READ COMMITTED. |
void |
close()
If the result set has been opened, close the open scan. |
ExecRow |
getNextRowCore()
Return the next row (if any) from the scan (if open). |
void |
openCore()
Open up the result set. |
protected void |
openScanController(TransactionController tc)
Open the scan controller |
private int |
reloadArray()
|
void |
reopenCore()
Reopen the result set. |
boolean |
requiresRelocking()
Do we need to relock the row when going to the heap. |
Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.derby.iapi.sql.execute.CursorResultSet |
getCurrentRow, getRowLocation |
Methods inherited from interface org.apache.derby.iapi.sql.ResultSet |
checkRowPosition, cleanUp, finish, getAbsoluteRow, getAutoGeneratedKeysResultset, getBeginExecutionTimestamp, getCursorName, getEndExecutionTimestamp, getExecuteTime, getFirstRow, getLastRow, getNextRow, getPreviousRow, getRelativeRow, getResultDescription, getRowNumber, getSubqueryTrackingArray, getTimeSpent, getWarnings, isClosed, modifiedRowCount, open, returnsRows, setAfterLastRow, setBeforeFirstRow |
Field Detail |
private DataValueDescriptor[][] rowArray
private int curRowPosition
private int numRowsInArray
private static int OUT_OF_ROWS
Constructor Detail |
public BulkTableScanResultSet(long conglomId, StaticCompiledOpenConglomInfo scoci, Activation activation, GeneratedMethod resultRowAllocator, int resultSetNumber, GeneratedMethod startKeyGetter, int startSearchOperator, GeneratedMethod stopKeyGetter, int stopSearchOperator, boolean sameStartStopPosition, Qualifier[][] qualifiers, java.lang.String tableName, java.lang.String indexName, boolean isConstraint, boolean forUpdate, int colRefItem, int indexColItem, int lockMode, boolean tableLocked, int isolationLevel, int rowsPerRead, boolean oneRowScan, double optimizerEstimatedRowCount, double optimizerEstimatedCost, GeneratedMethod closeCleanup) throws StandardException
StandardException
- thrown on failure to openResultSetFactory.getBulkTableScanResultSet(long, int, org.apache.derby.iapi.sql.Activation, org.apache.derby.iapi.services.loader.GeneratedMethod, int, org.apache.derby.iapi.services.loader.GeneratedMethod, int, org.apache.derby.iapi.services.loader.GeneratedMethod, int, boolean, org.apache.derby.iapi.store.access.Qualifier[][], java.lang.String, java.lang.String, boolean, boolean, int, int, int, boolean, int, int, boolean, double, double, org.apache.derby.iapi.services.loader.GeneratedMethod)
Method Detail |
protected void openScanController(TransactionController tc) throws StandardException
openScanController
in class TableScanResultSet
StandardException
- thrown on failure to openpublic void openCore() throws StandardException
openCore
in interface NoPutResultSet
openCore
in class TableScanResultSet
StandardException
- thrown on failure to openpublic void reopenCore() throws StandardException
reopenCore
in interface NoPutResultSet
reopenCore
in class TableScanResultSet
StandardException
- thrown on failure to openpublic ExecRow getNextRowCore() throws StandardException
getNextRowCore
in interface NoPutResultSet
getNextRowCore
in class TableScanResultSet
StandardException
- thrown on failure to get next rowprivate int reloadArray() throws StandardException
StandardException
public void close() throws StandardException
close
in interface ResultSet
close
in class TableScanResultSet
StandardException
- on errorprotected boolean canGetInstantaneousLocks()
canGetInstantaneousLocks
in class TableScanResultSet
public boolean requiresRelocking()
NoPutResultSet
requiresRelocking
in interface NoPutResultSet
requiresRelocking
in class TableScanResultSet
NoPutResultSet.requiresRelocking()
|
Built on Mon 2007-06-04 09:58:47+0400, from revision ??? | |||||||||
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