Interface NoPutResultSet
- All Superinterfaces:
ResultSet
,RowLocationRetRowSource
,RowSource
- All Known Implementing Classes:
AnyResultSet
,BasicNoPutResultSetImpl
,BulkTableScanResultSet
,CurrentOfResultSet
,DependentResultSet
,DistinctGroupedAggregateResultSet
,DistinctScalarAggregateResultSet
,DistinctScanResultSet
,GenericAggregateResultSet
,GroupedAggregateResultSet
,HashJoinResultSet
,HashLeftOuterJoinResultSet
,HashScanResultSet
,HashTableResultSet
,IndexRowToBaseRowResultSet
,JoinResultSet
,LastIndexKeyResultSet
,MaterializedResultSet
,MergeJoinResultSet
,MultiProbeTableScanResultSet
,NestedLoopJoinResultSet
,NestedLoopLeftOuterJoinResultSet
,NoPutResultSetImpl
,NormalizeResultSet
,OnceResultSet
,ProjectRestrictResultSet
,RowCountResultSet
,RowResultSet
,ScalarAggregateResultSet
,ScanResultSet
,ScrollInsensitiveResultSet
,SetOpResultSet
,SortResultSet
,TableScanResultSet
,TemporaryRowHolderResultSet
,UnionResultSet
,ValidateCheckConstraintResultSet
,VTIResultSet
,WindowResultSet
The NoPutResultSet interface is used to provide additional
operations on result sets that can be used in returning rows
up a ResultSet tree.
Since the ResulSet operations must also be supported by NoPutResultSets, we extend that interface here as well.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final String
static final String
static final String
static final String
static final String
static final String
static final int
Fields inherited from interface org.apache.derby.iapi.sql.ResultSet
CURRENT_RESULTSET_ONLY, ENTIRE_RESULTSET_TREE, ISAFTERLAST, ISBEFOREFIRST, ISFIRST, ISLAST
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Method Summary
Modifier and TypeMethodDescriptiondouble
Get the estimated row count from this result set.Return the requested values computed from the next row (if any) for which the restriction evaluates to true.int
Return the point of attachment for this subquery.int
Return the isolation level of the scan in the result set.boolean
Is this ResultSet or it's source result set for updatevoid
Mark the ResultSet as the topmost one in the ResultSet tree.void
Marks the resultSet's currentRow as deleted after a delete has been issued by either by using positioned delete or JDBC's deleteRow method.void
openCore()
open a scan on the table. scan parameters are evaluated at each open, so there is probably some way of altering their values...void
Positions the cursor in the specified rowLocation.void
reopen the scan.boolean
Do we need to relock the row when going to the heap.int
Get the number of this ResultSet, which is guaranteed to be unique within a statement.void
setCurrentRow
(ExecRow row) Set the current row to the row passed in.void
Set that we are acting on behalf of an insert result set that has deferrable check constraintsvoid
setNeedsRowLocation
(boolean needsRowLocation) Set whether or not the NPRS need the row location when acting as a row source.void
Notify a NPRS that it is the source for the specified TargetResultSet.void
updateRow
(ExecRow row, RowChanger rowChanger) 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.Methods inherited from interface org.apache.derby.iapi.sql.ResultSet
addWarning, checkRowPosition, cleanUp, clearCurrentRow, close, finish, getAbsoluteRow, getActivation, getAutoGeneratedKeysResultset, getBeginExecutionTimestamp, getCursorName, getEndExecutionTimestamp, getExecuteTime, getFirstRow, getLastRow, getNextRow, getPreviousRow, getRelativeRow, getResultDescription, getRowNumber, getSubqueryTrackingArray, getTimeSpent, getWarnings, isClosed, modifiedRowCount, open, returnsRows, setAfterLastRow, setBeforeFirstRow, toXML
Methods inherited from interface org.apache.derby.iapi.store.access.RowLocationRetRowSource
needsRowLocation, needsRowLocationForDeferredCheckConstraints, offendingRowLocation, rowLocation
Methods inherited from interface org.apache.derby.iapi.store.access.RowSource
closeRowSource, getNextRowFromRowSource, getValidColumns, needsToClone
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Field Details
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ABSOLUTE
- See Also:
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RELATIVE
- See Also:
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FIRST
- See Also:
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NEXT
- See Also:
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LAST
- See Also:
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PREVIOUS
- See Also:
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TEMPORARY_RESULT_SET_NUMBER
static final int TEMPORARY_RESULT_SET_NUMBER- See Also:
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Method Details
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markAsTopResultSet
void markAsTopResultSet()Mark the ResultSet as the topmost one in the ResultSet tree. Useful for closing down the ResultSet on an error. -
openCore
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.
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reopenCore
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.
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getNextRowCore
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.
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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)
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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).
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setTargetResultSet
Notify a NPRS that it is the source for the specified TargetResultSet. This is useful when doing bulk insert.- Parameters:
trs
- The TargetResultSet.
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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.
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resultSetNumber
int resultSetNumber()Get the number of this ResultSet, which is guaranteed to be unique within a statement. -
setCurrentRow
Set the current row to the row passed in.- Parameters:
row
- the new current row
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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.
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isForUpdate
boolean isForUpdate()Is this ResultSet or it's source result set for update- Returns:
- Whether or not the result set is for update.
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updateRow
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 currentRowrowChanger
- 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.
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markRowAsDeleted
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.
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positionScanAtRowLocation
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
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