org.apache.derby.impl.sql.execute

Class MiscResultSet

java.lang.Object

org.apache.derby.impl.sql.execute.NoRowsResultSetImpl

org.apache.derby.impl.sql.execute.MiscResultSet

All Implemented Interfaces:

ResultSet

Direct Known Subclasses:

SetTransactionResultSet

class MiscResultSet
extends NoRowsResultSetImpl

This is a wrapper class which invokes the Execution-time logic for Misc statements. The real Execution-time logic lives inside the executeConstantAction() method. Note that when re-using the language result set tree across executions (DERBY-827) it is not possible to store the ConstantAction as a member variable, because a re-prepare of the statement will invalidate the stored ConstantAction. Re-preparing a statement does not create a new Activation unless the GeneratedClass has changed, so the existing result set tree may survive a re-prepare.

Field Summary

Fields inherited from class org.apache.derby.impl.sql.execute.NoRowsResultSetImpl

activation, beginExecutionTime, beginTime, endExecutionTime, endTime, lcc

Fields inherited from interface org.apache.derby.iapi.sql.ResultSet

CURRENT_RESULTSET_ONLY, ENTIRE_RESULTSET_TREE, ISAFTERLAST, ISBEFOREFIRST, ISFIRST, ISLAST

Constructor Summary

Constructors

Constructor and Description
MiscResultSet(Activation activation) Construct a MiscResultSet

Method Summary

Modifier and Type	Method and Description
void	cleanUp() No action is required, but not implemented in any base class
void	open() Opens a MiscResultSet, executes the Activation's ConstantAction, and then immediately closes the MiscResultSet.

Methods inherited from class org.apache.derby.impl.sql.execute.NoRowsResultSetImpl

addWarning, checkRowPosition, clearCurrentRow, close, doesCommit, evaluateACheckConstraint, evaluateCheckConstraints, evaluateGenerationClauses, finish, getAbsoluteRow, getActivation, getAutoGeneratedKeysResultset, getBeginExecutionTimestamp, getCurrentTimeMillis, getCursorName, getEndExecutionTimestamp, getExecuteTime, getFirstRow, getLastRow, getNextRow, getPreviousRow, getQueryPlanText, getRelativeRow, getResultDescription, getRowNumber, getSubqueryTrackingArray, getTimeSpent, getWarnings, isClosed, modifiedRowCount, returnsRows, setAfterLastRow, setBeforeFirstRow, setup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MiscResultSet

MiscResultSet(Activation activation)

Construct a MiscResultSet

Parameters:

activation - Describes run-time environment.

Method Detail

open

public void open()
          throws StandardException

Opens a MiscResultSet, executes the Activation's ConstantAction, and then immediately closes the MiscResultSet.

Throws:

StandardException - Standard Derby error policy.

cleanUp

public void cleanUp()

No action is required, but not implemented in any base class

See Also:

ResultSet.cleanUp()