org.apache.derby.impl.sql
Class GenericActivationHolder

java.lang.Object
  org.apache.derby.impl.sql.GenericActivationHolder

All Implemented Interfaces:

Dependable, Activation, Dependent

public final class GenericActivationHolder
extends java.lang.Object
implements Activation

This class holds an Activation, and passes through most of the calls to the activation. The purpose of this class is to allow a PreparedStatement to be recompiled without the caller having to detect this and get a new activation. In addition to the Activation, this class holds a reference to the PreparedStatement that created it, along with a reference to the GeneratedClass that was associated with the PreparedStatement at the time this holder was created. These references are used to validate the Activation, to ensure that an activation is used only with the PreparedStatement that created it, and to detect when recompilation has happened. We detect recompilation by checking whether the GeneratedClass has changed. If it has, we try to let the caller continue to use this ActivationHolder. We create a new instance of the new GeneratedClass (that is, we create a new Activation), and we compare the number and type of parameters. If these are compatible, we copy the parameters from the old to the new Activation. If they are not compatible, we throw an exception telling the user that the Activation is out of date, and they need to get a new one.

Field Summary

BaseActivation	ac
(package private) GeneratedClass	gc
private LanguageConnectionContext	lcc
(package private) DataTypeDescriptor[]	paramTypes
(package private) ExecPreparedStatement	ps

Fields inherited from interface org.apache.derby.catalog.Dependable

ACTIVATION, ALIAS, COLUMNS_IN_TABLE, COLUMNS_PERMISSION, CONGLOMERATE, CONSTRAINT, DEFAULT, FILE, HEAP, INDEX, PERM, PREPARED_STATEMENT, ROLE_GRANT, ROUTINE_PERMISSION, SCHEMA, SEQUENCE, STORED_PREPARED_STATEMENT, TABLE, TABLE_PERMISSION, TRIGGER, VIEW

Constructor Summary

GenericActivationHolder(LanguageConnectionContext lcc, GeneratedClass gc, ExecPreparedStatement ps, boolean scrollable)
Constructor for an ActivationHolder

Method Summary

void	addWarning(java.sql.SQLWarning w) Add a warning to the activation
boolean	checkIfThisActivationHasHoldCursor(java.lang.String tableName) Temporary tables can be declared with ON COMMIT DELETE ROWS.
void	checkStatementValidity() Check the validity of the current executing statement.
void	clearCurrentRow(int resultSetNumber) Generated plans have a current row field for ease in defining the methods and finding them dynamically.
void	clearHeapConglomerateController() Clear the ConglomerateController to be used for an update or delete.
void	clearIndexScanInfo() Clear the info for the index to be re-used for update/delete.
void	clearParentResultSets()
void	clearWarnings() Clear the activation's warnings.
void	close() Closing an activation statement marks it as unusable.
ResultSet	execute() When the prepared statement is executed, it passes execution on to the activation execution was requested for.
int[]	getAutoGeneratedKeysColumnIndexes() Returns the column positions array of columns requested in auto-generated keys resultset for this avtivation.
java.lang.String[]	getAutoGeneratedKeysColumnNames() Returns the column names array of columns requested in auto-generated keys resultset for this avtivation.
boolean	getAutoGeneratedKeysResultsetMode() Returns true if auto-generated keys resultset request was made for this avtivation.
java.lang.String	getClassType() Get the unique class id for the Dependable.
ConstantAction	getConstantAction()
Row	getCurrentRow(int resultSetNumber) Get the current row at the given index.
java.lang.String	getCursorName() Return the cursor name of this activation.
DataValueFactory	getDataValueFactory() Get the DataValueFactory
TableDescriptor	getDDLTableDescriptor() Get the TableDescriptor for the target of DDL.
DependableFinder	getDependableFinder() Get an object which can be written to disk and which, when read from disk, will find or reconstruct this in-memory Dependable.
java.sql.ResultSet[][]	getDynamicResults() Return the set of dynamical created result sets, for procedures.
ExecutionFactory	getExecutionFactory() Get the ExecutionFactory
boolean	getForCreateTable() Get whether or not this activation is for create table.
CursorResultSet	getForUpdateIndexScan()
ConglomerateController	getHeapConglomerateController() Get the ConglomerateController, if any, that has already been opened for the heap when scaning for an update or delete.
long	getIndexConglomerateNumber() Get the conglomerate number of the index, if any, that has already been opened for scaning for an update or delete.
ScanController	getIndexScanController() Get the ScanController, if any, that has already been opened for the index when scaning for an update or delete.
LanguageConnectionContext	getLanguageConnectionContext() Get the language connection context associated with this activation
int	getMaxDynamicResults() Return the maximum number of dynamical created result sets from the procedure definition.
long	getMaxRows() Get the maximum # of rows. (# of rows that can be returned by a ResultSet. 0 means no limit.)
int	getNumSubqueries() Get the number of subqueries in the entire query.
UUID	getObjectID() Get the UUID of this Dependable OBJECT.
java.lang.String	getObjectName() Get the name of this Dependable OBJECT.
ParameterValueSet	getParameterValueSet() Gets the ParameterValueSet for this execution of the statement.
Activation	getParentActivation() This activation is created in a dynamic call context, or substatement execution context; get its caller's or superstatement's activation.
java.util.Vector	getParentResultSet(java.lang.String resultSetId) get the reference to parent table ResultSets, that will be needed by the referential action dependent table scans.
java.util.Hashtable	getParentResultSets()
ExecPreparedStatement	getPreparedStatement() Get the prepared statement that this activation is for.
ResultDescription	getResultDescription() Get the result description for this activation, if it has one.
ResultSet	getResultSet() Returns the current result set for this activation, i.e.
boolean	getResultSetHoldability() Return the holdability of this activation.
RowLocation	getRowLocationTemplate(int itemNumber) Get the saved RowLocation.
SQLSessionContext	getSQLSessionContextForChildren() Get the current SQL session context if in a nested connection of a stored routine or in a substatement.
java.sql.ResultSet	getTargetVTI() Get the ResultSet for the target of an update/delete to a VTI.
TransactionController	getTransactionController() Get the Execution TransactionController associated with this activation/lcc.
java.sql.SQLWarning	getWarnings() Returns the chained list of warnings.
void	informOfRowCount(NoPutResultSet resultSet, long rowCount) Tell this activation that the given ResultSet was found to have the given number of rows.
boolean	isClosed() Find out if the activation is closed or not.
boolean	isCursorActivation() Is this Activation for a cursor?
boolean	isInUse() Is the activation in use?
boolean	isPersistent() Return whether or not this Dependable is persistent.
boolean	isSingleExecution() Is the activation set up for a single execution.
boolean	isValid() Check that all of the dependent's dependencies are valid.
void	makeInvalid(int action, LanguageConnectionContext lcc) Mark the dependent as invalid (due to at least one of its dependencies being invalid).
void	markUnused() Mark the activation as unused.
void	prepareToInvalidate(Provider p, int action, LanguageConnectionContext lcc) Prepare to mark the dependent as invalid (due to at least one of its dependencies being invalid).
void	reset() Resets the activation to the "pre-execution" state - that is, the state where it can be used to begin a new execution.
void	setAutoGeneratedKeysResultsetInfo(int[] columnIndexes, java.lang.String[] columnNames) Set the auto-generated keys resultset mode to true for this activation.
void	setCurrentRow(ExecRow currentRow, int resultSetNumber) Generated plans have a current row field for ease in defining the methods and finding them dynamically.
void	setCursorName(java.lang.String cursorName) JDBC requires that all select statements be converted into cursors, and that the cursor name be settable for each execution of a select statement.
void	setDDLTableDescriptor(TableDescriptor td) Save the TableDescriptor for the target of DDL so that it can be passed between the various ConstantActions during execution.
void	setForCreateTable() Mark the Activation as being for create table.
void	setForUpdateIndexScan(CursorResultSet forUpdateResultSet) beetle 3865: updateable cursor using index.
void	setHeapConglomerateController(ConglomerateController updateHeapCC) Set the ConglomerateController to be used for an update or delete.
void	setIndexConglomerateNumber(long indexConglomerateNumber) Set the conglomerate number of the index to be used for an update or delete, when scanning an index that will also be updated (Saves opening the ScanController twice.)
void	setIndexScanController(ScanController indexSC) Set the ScanController to be used for an update or delete, when scanning an index that will also be updated (Saves opening the ScanController twice.)
void	setMaxRows(long maxRows) Set the maximum # of rows. (# of rows that can be returned by a ResultSet. 0 means no limit.)
void	setParameters(ParameterValueSet parameterValues, DataTypeDescriptor[] parameterTypes) Sets the parameter values for this execution of the statement.
void	setParentActivation(Activation a) This activation is created in a dynamic call context or a substatement execution context, chain its parent statements activation..
void	setParentResultSet(TemporaryRowHolder rs, java.lang.String resultSetId)
void	setResultSetHoldability(boolean resultSetHoldability) Set current resultset holdability.
void	setSingleExecution() Set the activation for a single execution.
void	setTargetVTI(java.sql.ResultSet targetVTI) Save the ResultSet for the target of an update/delete to a VTI.
SQLSessionContext	setupSQLSessionContextForChildren(boolean push) Set up and return the current SQL session context for all immediately nested connections stemming from the call or function invocation of the statement corresponding to this activation (push=true) or for a substatement, which shares the parents statement's session context (push=false).

Methods inherited from class java.lang.Object

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

Field Detail

ac

public BaseActivation ac

ps

ExecPreparedStatement ps

gc

GeneratedClass gc

paramTypes

DataTypeDescriptor[] paramTypes

lcc

private final LanguageConnectionContext lcc

Constructor Detail

GenericActivationHolder

GenericActivationHolder(LanguageConnectionContext lcc,
                        GeneratedClass gc,
                        ExecPreparedStatement ps,
                        boolean scrollable)
                  throws StandardException

Constructor for an ActivationHolder

Parameters:

gc - The GeneratedClass of the Activation

ps - The PreparedStatement this ActivationHolder is associated with

Throws:

StandardException - Thrown on error

Method Detail

reset

public void reset()
           throws StandardException

Description copied from interface: Activation

Resets the activation to the "pre-execution" state - that is, the state where it can be used to begin a new execution. Frees local buffers, stops scans, resets counters to zero, sets current date and time to an unitialized state, etc.

Specified by:

reset in interface Activation

Throws:

StandardException - thrown on failure

See Also:

Activation.reset()

checkIfThisActivationHasHoldCursor

public boolean checkIfThisActivationHasHoldCursor(java.lang.String tableName)

Temporary tables can be declared with ON COMMIT DELETE ROWS. But if the table has a held curosr open at commit time, data should not be deleted from the table. This method, (gets called at commit time) checks if this activation held cursor and if so, does that cursor reference the passed temp table name.

Specified by:

checkIfThisActivationHasHoldCursor in interface Activation

Returns:

true if this activation has held cursor and if it references the passed temp table name

setCursorName

public void setCursorName(java.lang.String cursorName)

Description copied from interface: Activation

JDBC requires that all select statements be converted into cursors, and that the cursor name be settable for each execution of a select statement. The Language Module will support this, so that the JDBC driver will not have to parse JSQL text. This method will have no effect when called on non-select statements.

There will be a JSQL statement to disable the "cursorization" of all select statements. For non-cursorized select statements, this method will have no effect.

This has no effect if the activation has been closed.

Specified by:

setCursorName in interface Activation

Parameters:

cursorName - The cursor name to use.

See Also:

Activation.setCursorName(java.lang.String)

getCursorName

public java.lang.String getCursorName()

Description copied from interface: Activation

Return the cursor name of this activation. This will differ from its ResultSet's cursor name if it has been altered with setCursorName. Thus this always returns the cursor name of the next execution of this activation. The cursor name of the current execution must be obtained from the ResultSet. or this.getResultSet.getCursorName() [with null checking].

Statements that do not support cursors will return a null.

Specified by:

getCursorName in interface Activation

Returns:

The cursor name.

See Also:

Activation.getCursorName()

setResultSetHoldability

public void setResultSetHoldability(boolean resultSetHoldability)

Description copied from interface: Activation

Set current resultset holdability.

Specified by:

setResultSetHoldability in interface Activation

Parameters:

resultSetHoldability - The new resultset holdability.

See Also:

Activation.setResultSetHoldability(boolean)

getResultSetHoldability

public boolean getResultSetHoldability()

Description copied from interface: Activation

Return the holdability of this activation.

Specified by:

getResultSetHoldability in interface Activation

Returns:

The holdability of this activation.

See Also:

Activation.getResultSetHoldability()

setAutoGeneratedKeysResultsetInfo

public void setAutoGeneratedKeysResultsetInfo(int[] columnIndexes,
                                              java.lang.String[] columnNames)

Description copied from interface: Activation

Set the auto-generated keys resultset mode to true for this activation. The specific columns for auto-generated keys resultset can be requested by passing column positions array The specific columns for auto-generated keys resultset can be requested by passing column names array Both the parameters would be null if user didn't request specific keys. Otherwise, the user could request specific columns by passing column positions or names array but not both.

Specified by:

setAutoGeneratedKeysResultsetInfo in interface Activation

Parameters:

columnIndexes - Request specific columns in auto-generated keys resultset by passing column positions. null means no specific columns requested by position

columnNames - Request specific columns in auto-generated keys resultset by passing column names. null means no specific columns requested by position

See Also:

Activation.setAutoGeneratedKeysResultsetInfo(int[], java.lang.String[])

getAutoGeneratedKeysResultsetMode

public boolean getAutoGeneratedKeysResultsetMode()

Description copied from interface: Activation

Returns true if auto-generated keys resultset request was made for this avtivation.

Specified by:

getAutoGeneratedKeysResultsetMode in interface Activation

Returns:

auto-generated keys resultset mode for this activation.

See Also:

Activation.getAutoGeneratedKeysResultsetMode()

getAutoGeneratedKeysColumnIndexes

public int[] getAutoGeneratedKeysColumnIndexes()

Description copied from interface: Activation

Returns the column positions array of columns requested in auto-generated keys resultset for this avtivation. Returns null if no specific column requested by positions

Specified by:

getAutoGeneratedKeysColumnIndexes in interface Activation

Returns:

column positions array of columns requested.

See Also:

Activation.getAutoGeneratedKeysColumnIndexes()

getAutoGeneratedKeysColumnNames

public java.lang.String[] getAutoGeneratedKeysColumnNames()

Description copied from interface: Activation

Returns the column names array of columns requested in auto-generated keys resultset for this avtivation. Returns null if no specific column requested by names

Specified by:

getAutoGeneratedKeysColumnNames in interface Activation

Returns:

column names array of columns requested.

See Also:

Activation.getAutoGeneratedKeysColumnNames()

getLanguageConnectionContext

public LanguageConnectionContext getLanguageConnectionContext()

Description copied from interface: Activation

Get the language connection context associated with this activation

Specified by:

getLanguageConnectionContext in interface Activation

See Also:

Activation.getLanguageConnectionContext()

getTransactionController

public TransactionController getTransactionController()

Description copied from interface: Activation

Get the Execution TransactionController associated with this activation/lcc.

Specified by:

getTransactionController in interface Activation

getExecutionFactory

public ExecutionFactory getExecutionFactory()

Description copied from interface: Activation

Get the ExecutionFactory

Specified by:

getExecutionFactory in interface Activation

Returns:

ExecutionFactory

See Also:

Activation.getExecutionFactory()

getParameterValueSet

public ParameterValueSet getParameterValueSet()

Description copied from interface: Activation

Gets the ParameterValueSet for this execution of the statement.

Specified by:

getParameterValueSet in interface Activation

Returns:

The ParameterValueSet for this execution of the statement. Returns NULL if there are no parameters.

See Also:

Activation.getParameterValueSet()

setParameters

public void setParameters(ParameterValueSet parameterValues,
                          DataTypeDescriptor[] parameterTypes)
                   throws StandardException

Description copied from interface: Activation

Sets the parameter values for this execution of the statement.

Has no effect if the activation has been closed.

NOTE: The setParameters() method is currently unimplemented. A statement with parameters will generate its own ParameterValueSet, which can be gotten with the getParameterValueSet() method (above). The idea behind setParameters() is to improve performance when operating across a network by allowing all the parameters to be set in one call, as opposed to one call per parameter.

Specified by:

setParameters in interface Activation

Parameters:

parameterValues - The values of the parameters.

Throws:

StandardException

See Also:

Activation.setParameters(org.apache.derby.iapi.sql.ParameterValueSet, org.apache.derby.iapi.types.DataTypeDescriptor[])

execute

public ResultSet execute()
                  throws StandardException

Description copied from interface: Activation

When the prepared statement is executed, it passes execution on to the activation execution was requested for.

Specified by:

execute in interface Activation

Returns:

the ResultSet for further manipulation, if any.

Throws:

StandardException - Thrown on failure

See Also:

Activation.execute()

getResultSet

public ResultSet getResultSet()

Description copied from interface: Activation

Returns the current result set for this activation, i.e. the one returned by the last execute() call. If there has been no execute call or the activation has been reset or closed, a null is returned.

Specified by:

getResultSet in interface Activation

Returns:

the current ResultSet of this activation.

See Also:

Activation.getResultSet()

setCurrentRow

public void setCurrentRow(ExecRow currentRow,
                          int resultSetNumber)

Description copied from interface: Activation

Generated plans have a current row field for ease in defining the methods and finding them dynamically. The interface is used to set the row before a dynamic method that uses it is invoked.

When all processing on the currentRow has been completed, callers should call activation.clearCurrentRow(resultSetNumber) to ensure that no unnecessary references are retained to rows. This will allow the rows no longer in use to be collected by the garbage collecter.

Specified by:

setCurrentRow in interface Activation

Parameters:

currentRow - The row to be operated upon.

resultSetNumber - The resultSetNumber for the current ResultSet

See Also:

Activation.setCurrentRow(org.apache.derby.iapi.sql.execute.ExecRow, int)

getCurrentRow

public Row getCurrentRow(int resultSetNumber)

Description copied from interface: Activation

Get the current row at the given index.

Specified by:

getCurrentRow in interface Activation

See Also:

Activation.getCurrentRow(int)

clearCurrentRow

public void clearCurrentRow(int resultSetNumber)

Description copied from interface: Activation

Generated plans have a current row field for ease in defining the methods and finding them dynamically. The interface is used to set the row before a dynamic method that uses it is invoked.

When all processing on the currentRow has been completed, callers should call activation.clearCurrentRow(resultSetNumber) to ensure that no unnecessary references are retained to rows. This will allow the rows no longer in use to be collected by the garbage collecter.

Specified by:

clearCurrentRow in interface Activation

Parameters:

resultSetNumber - The resultSetNumber for the current ResultSet

See Also:

Activation.clearCurrentRow(int)

getPreparedStatement

public ExecPreparedStatement getPreparedStatement()

Description copied from interface: Activation

Get the prepared statement that this activation is for.

Specified by:

getPreparedStatement in interface Activation

Returns:

the prepared statement this activation is for.

See Also:

Activation.getPreparedStatement()

checkStatementValidity

public void checkStatementValidity()
                            throws StandardException

Description copied from interface: Activation

Check the validity of the current executing statement. Needs to be called after a statement has obtained the relevant table locks on the

Specified by:

checkStatementValidity in interface Activation

Throws:

StandardException

getResultDescription

public ResultDescription getResultDescription()

Description copied from interface: Activation

Get the result description for this activation, if it has one.

Specified by:

getResultDescription in interface Activation

Returns:

result description for this activation, if it has one; otherwise, null.

See Also:

Activation.getResultDescription()

getDataValueFactory

public DataValueFactory getDataValueFactory()

Description copied from interface: Activation

Get the DataValueFactory

Specified by:

getDataValueFactory in interface Activation

Returns:

DataValueFactory

See Also:

Activation.getDataValueFactory()

getRowLocationTemplate

public RowLocation getRowLocationTemplate(int itemNumber)

Description copied from interface: Activation

Get the saved RowLocation.

Specified by:

getRowLocationTemplate in interface Activation

Parameters:

itemNumber - The saved item number.

Returns:

A RowLocation template for the conglomerate

See Also:

Activation.getRowLocationTemplate(int)

getHeapConglomerateController

public ConglomerateController getHeapConglomerateController()

Description copied from interface: Activation

Get the ConglomerateController, if any, that has already been opened for the heap when scaning for an update or delete. (Saves opening the ConglomerateController twice.)

Specified by:

getHeapConglomerateController in interface Activation

Returns:

The ConglomerateController, if available, to use for the update.

See Also:

Activation.getHeapConglomerateController()

setHeapConglomerateController

public void setHeapConglomerateController(ConglomerateController updateHeapCC)

Description copied from interface: Activation

Set the ConglomerateController to be used for an update or delete. (Saves opening the ConglomerateController twice.)

Specified by:

setHeapConglomerateController in interface Activation

Parameters:

updateHeapCC - The ConglomerateController to reuse for the update or delete.

See Also:

Activation.setHeapConglomerateController(org.apache.derby.iapi.store.access.ConglomerateController)

clearHeapConglomerateController

public void clearHeapConglomerateController()

Description copied from interface: Activation

Clear the ConglomerateController to be used for an update or delete. (Saves opening the ConglomerateController twice.)

Specified by:

clearHeapConglomerateController in interface Activation

See Also:

Activation.clearHeapConglomerateController()

getIndexScanController

public ScanController getIndexScanController()

Description copied from interface: Activation

Get the ScanController, if any, that has already been opened for the index when scaning for an update or delete. (Saves opening the ScanController twice.)

Specified by:

getIndexScanController in interface Activation

Returns:

The ScanController, if available, to use for the update.

See Also:

Activation.getIndexScanController()

setIndexScanController

public void setIndexScanController(ScanController indexSC)

Description copied from interface: Activation

Set the ScanController to be used for an update or delete, when scanning an index that will also be updated (Saves opening the ScanController twice.)

Specified by:

setIndexScanController in interface Activation

Parameters:

indexSC - The ScanController to reuse for the update or delete.

See Also:

Activation.setIndexScanController(org.apache.derby.iapi.store.access.ScanController)

getIndexConglomerateNumber

public long getIndexConglomerateNumber()

Description copied from interface: Activation

Get the conglomerate number of the index, if any, that has already been opened for scaning for an update or delete. (Saves opening the ScanController twice.)

Specified by:

getIndexConglomerateNumber in interface Activation

Returns:

The conglomerate number, if available, to use for the update.

See Also:

Activation.getIndexConglomerateNumber()

setIndexConglomerateNumber

public void setIndexConglomerateNumber(long indexConglomerateNumber)

Description copied from interface: Activation

Set the conglomerate number of the index to be used for an update or delete, when scanning an index that will also be updated (Saves opening the ScanController twice.)

Specified by:

setIndexConglomerateNumber in interface Activation

Parameters:

indexConglomerateNumber - The conglomerate number of the index to reuse for the update or delete.

See Also:

Activation.setIndexConglomerateNumber(long)

clearIndexScanInfo

public void clearIndexScanInfo()

Description copied from interface: Activation

Clear the info for the index to be re-used for update/delete. (ScanController and conglomerate number.)

Specified by:

clearIndexScanInfo in interface Activation

See Also:

Activation.clearIndexScanInfo()

close

public void close()
           throws StandardException

Description copied from interface: Activation

Closing an activation statement marks it as unusable. Any other requests made on it will fail. An activation should be marked closed when it is expected to not be used any longer, i.e. when the connection for it is closed, or it has suffered some sort of severe error. This will also close its result set and release any resources it holds e.g. for parameters.

Any class that implements this must be prepared to be executed from garbage collection, ie. there is no matching context stack.

Specified by:

close in interface Activation

Throws:

StandardException - Thrown on error

See Also:

Activation.close()

isClosed

public boolean isClosed()

Description copied from interface: Activation

Find out if the activation is closed or not.

Specified by:

isClosed in interface Activation

Returns:

true if the Activation has been closed.

See Also:

Activation.isClosed()

setSingleExecution

public void setSingleExecution()

Set the activation for a single execution.

Specified by:

setSingleExecution in interface Activation

See Also:

Activation.setSingleExecution()

isSingleExecution

public boolean isSingleExecution()

Is the activation set up for a single execution.

Specified by:

isSingleExecution in interface Activation

See Also:

Activation.isSingleExecution()

getNumSubqueries

public int getNumSubqueries()

Get the number of subqueries in the entire query.

Specified by:

getNumSubqueries in interface Activation

Returns:

int The number of subqueries in the entire query.

setForCreateTable

public void setForCreateTable()

Description copied from interface: Activation

Mark the Activation as being for create table. (NOTE: We can do certain optimizations for create table that we can't do for other DDL.)

Specified by:

setForCreateTable in interface Activation

See Also:

Activation.setForCreateTable()

getForCreateTable

public boolean getForCreateTable()

Description copied from interface: Activation

Get whether or not this activation is for create table. (NOTE: We can do certain optimizations for create table that we can't do for other DDL.)

Specified by:

getForCreateTable in interface Activation

Returns:

Whether or not this activation is for create table.

See Also:

Activation.getForCreateTable()

setDDLTableDescriptor

public void setDDLTableDescriptor(TableDescriptor td)

Description copied from interface: Activation

Save the TableDescriptor for the target of DDL so that it can be passed between the various ConstantActions during execution.

Specified by:

setDDLTableDescriptor in interface Activation

See Also:

Activation.setDDLTableDescriptor(org.apache.derby.iapi.sql.dictionary.TableDescriptor)

getDDLTableDescriptor

public TableDescriptor getDDLTableDescriptor()

Description copied from interface: Activation

Get the TableDescriptor for the target of DDL.

Specified by:

getDDLTableDescriptor in interface Activation

Returns:

The TableDescriptor for the target of DDL.

See Also:

Activation.getDDLTableDescriptor()

setMaxRows

public void setMaxRows(long maxRows)

Description copied from interface: Activation

Set the maximum # of rows. (# of rows that can be returned by a ResultSet. 0 means no limit.)

Specified by:

setMaxRows in interface Activation

Parameters:

maxRows - Maximum # of rows. (0 means no limit.)

See Also:

Activation.setMaxRows(long)

getMaxRows

public long getMaxRows()

Description copied from interface: Activation

Get the maximum # of rows. (# of rows that can be returned by a ResultSet. 0 means no limit.)

Specified by:

getMaxRows in interface Activation

Returns:

Maximum # of rows. (0 means no limit.)

See Also:

Activation.getMaxRows()

setTargetVTI

public void setTargetVTI(java.sql.ResultSet targetVTI)

Description copied from interface: Activation

Save the ResultSet for the target of an update/delete to a VTI.

Specified by:

setTargetVTI in interface Activation

getTargetVTI

public java.sql.ResultSet getTargetVTI()

Description copied from interface: Activation

Get the ResultSet for the target of an update/delete to a VTI.

Specified by:

getTargetVTI in interface Activation

Returns:

The ResultSet for the target of an update/delete to a VTI.

getSQLSessionContextForChildren

public SQLSessionContext getSQLSessionContextForChildren()

Description copied from interface: Activation

Get the current SQL session context if in a nested connection of a stored routine or in a substatement.

Specified by:

getSQLSessionContextForChildren in interface Activation

setupSQLSessionContextForChildren

public SQLSessionContext setupSQLSessionContextForChildren(boolean push)

Description copied from interface: Activation

Set up and return the current SQL session context for all immediately nested connections stemming from the call or function invocation of the statement corresponding to this activation (push=true) or for a substatement, which shares the parents statement's session context (push=false).

Specified by:

setupSQLSessionContextForChildren in interface Activation

Parameters:

push - true if used to push a new connection context

setParentActivation

public void setParentActivation(Activation a)

Description copied from interface: Activation

This activation is created in a dynamic call context or a substatement execution context, chain its parent statements activation..

Specified by:

setParentActivation in interface Activation

getParentActivation

public Activation getParentActivation()

Description copied from interface: Activation

This activation is created in a dynamic call context, or substatement execution context; get its caller's or superstatement's activation.

Specified by:

getParentActivation in interface Activation

Returns:

The caller's activation

getDependableFinder

public DependableFinder getDependableFinder()

Description copied from interface: Dependable

Get an object which can be written to disk and which, when read from disk, will find or reconstruct this in-memory Dependable.

Specified by:

getDependableFinder in interface Dependable

Returns:

A Finder object that can be written to disk if this is a Persistent Dependable. Null if this is not a persistent dependable.

See Also:

Dependable.getDependableFinder()

getObjectName

public java.lang.String getObjectName()

Description copied from interface: Dependable

Get the name of this Dependable OBJECT. This is useful for diagnostic messages.

Specified by:

getObjectName in interface Dependable

Returns:

Name of Dependable OBJECT.

See Also:

Dependable.getObjectName()

getObjectID

public UUID getObjectID()

Description copied from interface: Dependable

Get the UUID of this Dependable OBJECT.

Specified by:

getObjectID in interface Dependable

Returns:

UUID of this OBJECT.

See Also:

Dependable.getObjectID()

getClassType

public java.lang.String getClassType()

Description copied from interface: Dependable

Get the unique class id for the Dependable. Every Dependable belongs to a class of Dependables.

Specified by:

getClassType in interface Dependable

Returns:

type of this Dependable.

See Also:

Dependable.getClassType()

isPersistent

public boolean isPersistent()

Description copied from interface: Dependable

Return whether or not this Dependable is persistent. Persistent dependencies are stored in SYS.SYSDEPENDS.

Specified by:

isPersistent in interface Dependable

Returns:

true if this Dependable is persistent.

See Also:

Dependable.isPersistent()

isValid

public boolean isValid()

Description copied from interface: Dependent

Check that all of the dependent's dependencies are valid.

Specified by:

isValid in interface Dependent

Returns:

true if the dependent is currently valid

See Also:

Dependent.isValid()

makeInvalid

public void makeInvalid(int action,
                        LanguageConnectionContext lcc)
                 throws StandardException

Description copied from interface: Dependent

Mark the dependent as invalid (due to at least one of its dependencies being invalid).

Specified by:

makeInvalid in interface Dependent

Parameters:

action - The action causing the invalidation

lcc - The LanguageConnectionContext

Throws:

StandardException - thrown if unable to make it invalid

See Also:

Dependent.makeInvalid(int, org.apache.derby.iapi.sql.conn.LanguageConnectionContext)

prepareToInvalidate

public void prepareToInvalidate(Provider p,
                                int action,
                                LanguageConnectionContext lcc)
                         throws StandardException

Description copied from interface: Dependent

Prepare to mark the dependent as invalid (due to at least one of its dependencies being invalid).

Specified by:

prepareToInvalidate in interface Dependent

Parameters:

p - the provider

action - The action causing the invalidation

lcc - The LanguageConnectionContext

Throws:

StandardException - thrown if unable to make it invalid

See Also:

Dependent.prepareToInvalidate(org.apache.derby.iapi.sql.depend.Provider, int, org.apache.derby.iapi.sql.conn.LanguageConnectionContext)

markUnused

public void markUnused()

Mark the activation as unused.

Specified by:

markUnused in interface Activation

isInUse

public boolean isInUse()

Is the activation in use?

Specified by:

isInUse in interface Activation

Returns:

true/false

addWarning

public void addWarning(java.sql.SQLWarning w)

Description copied from interface: Activation

Add a warning to the activation

Specified by:

addWarning in interface Activation

See Also:

Activation.addWarning(java.sql.SQLWarning)

getWarnings

public java.sql.SQLWarning getWarnings()

Description copied from interface: Activation

Returns the chained list of warnings. Returns null if there are no warnings.

Specified by:

getWarnings in interface Activation

See Also:

Activation.getWarnings()

clearWarnings

public void clearWarnings()

Description copied from interface: Activation

Clear the activation's warnings.

Specified by:

clearWarnings in interface Activation

See Also:

Activation.clearWarnings()

informOfRowCount

public void informOfRowCount(NoPutResultSet resultSet,
                             long rowCount)
                      throws StandardException

Description copied from interface: Activation

Tell this activation that the given ResultSet was found to have the given number of rows. This is used during execution to determine whether a table has grown or shrunk. If a table's size changes significantly, the activation may invalidate its PreparedStatement to force recompilation. Note that the association of row counts with ResultSets is kept in the activation class, not in the activation itself. This means that this method must be synchronized. This method is not required to check the number of rows on each call. Because of synchronization, this check is likely to be expensive, so it may only check every hundred calls or so.

Specified by:

informOfRowCount in interface Activation

Throws:

StandardException - Thrown on error

See Also:

Activation.informOfRowCount(org.apache.derby.iapi.sql.execute.NoPutResultSet, long)

isCursorActivation

public boolean isCursorActivation()

Description copied from interface: Activation

Is this Activation for a cursor?

Specified by:

isCursorActivation in interface Activation

Returns:

Whether or not this Activation is for a cursor.

See Also:

Activation.isCursorActivation()

getConstantAction

public ConstantAction getConstantAction()

Specified by:

getConstantAction in interface Activation

setParentResultSet

public void setParentResultSet(TemporaryRowHolder rs,
                               java.lang.String resultSetId)

Specified by:

setParentResultSet in interface Activation

getParentResultSet

public java.util.Vector getParentResultSet(java.lang.String resultSetId)

Description copied from interface: Activation

get the reference to parent table ResultSets, that will be needed by the referential action dependent table scans.

Specified by:

getParentResultSet in interface Activation

clearParentResultSets

public void clearParentResultSets()

Specified by:

clearParentResultSets in interface Activation

getParentResultSets

public java.util.Hashtable getParentResultSets()

Specified by:

getParentResultSets in interface Activation

setForUpdateIndexScan

public void setForUpdateIndexScan(CursorResultSet forUpdateResultSet)

Description copied from interface: Activation

beetle 3865: updateable cursor using index. A way of communication between cursor activation and update activation.

Specified by:

setForUpdateIndexScan in interface Activation

getForUpdateIndexScan

public CursorResultSet getForUpdateIndexScan()

Specified by:

getForUpdateIndexScan in interface Activation

getDynamicResults

public java.sql.ResultSet[][] getDynamicResults()

Description copied from interface: Activation

Return the set of dynamical created result sets, for procedures. Base implementation returns null, a generated class for a procedure overwrites this with a real implementation.

Specified by:

getDynamicResults in interface Activation

Returns:

null if no dynamic results exists. Otherwise an array of ResultSet arrays, each of length one containing null or a reference to a ResultSet.

getMaxDynamicResults

public int getMaxDynamicResults()

Description copied from interface: Activation

Return the maximum number of dynamical created result sets from the procedure definition. Base implementation returns 0, a generated class for a procedure overwrites this with a real implementation.

Specified by:

getMaxDynamicResults in interface Activation