MiscResultSet (Apache Derby V10.14 Internals)

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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 Description

MiscResultSet(Activation activation)
Construct a MiscResultSet

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`cleanUp()`	No action is required, but not implemented in any base class
`void`	`close()`	Tells the system that there will be no more calls to getNextRow() (until the next open() call), so it can free up the resources associated with the ResultSet.
`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, 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, toXML

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.
  - close
```
public void close()
           throws StandardException
```
    Description copied from interface: ResultSet
    
    Tells the system that there will be no more calls to getNextRow() (until the next open() call), so it can free up the resources associated with the ResultSet.
    
    Throws:
    
    StandardException - Thrown on error.
  - cleanUp
```
public void cleanUp()
```
    No action is required, but not implemented in any base class
    
    See Also:
    
    ResultSet.cleanUp()

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.