org.apache.derby.impl.sql.execute
Class GenericTriggerExecutor

java.lang.Object
  org.apache.derby.impl.sql.execute.GenericTriggerExecutor

Direct Known Subclasses:

RowTriggerExecutor, StatementTriggerExecutor

public abstract class GenericTriggerExecutor
extends java.lang.Object

A trigger executor is an object that executes a trigger. It is subclassed by row and statement executors.

Field Summary

private SPSDescriptor	action
private boolean	actionRetrieved
protected Activation	activation
protected LanguageConnectionContext	lcc
private ExecPreparedStatement	ps
private Activation	spsActivation
protected InternalTriggerExecutionContext	tec
protected TriggerDescriptor	triggerd
private SPSDescriptor	whenClause
private boolean	whenClauseRetrieved

Constructor Summary

GenericTriggerExecutor(InternalTriggerExecutionContext tec, TriggerDescriptor triggerd, Activation activation, LanguageConnectionContext lcc)
Constructor

Method Summary

protected void	clearSPS() Cleanup after executing an sps.
protected void	executeSPS(SPSDescriptor sps) Execute the given stored prepared statement.
(package private) abstract void	fireTrigger(TriggerEvent event, CursorResultSet brs, CursorResultSet ars, int[] colsReadFromTable) Fire the trigger based on the event.
protected SPSDescriptor	getAction()
protected SPSDescriptor	getWhenClause()

Methods inherited from class java.lang.Object

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

Field Detail

tec

protected InternalTriggerExecutionContext tec

triggerd

protected TriggerDescriptor triggerd

activation

protected Activation activation

lcc

protected LanguageConnectionContext lcc

whenClauseRetrieved

private boolean whenClauseRetrieved

actionRetrieved

private boolean actionRetrieved

whenClause

private SPSDescriptor whenClause

action

private SPSDescriptor action

ps

private ExecPreparedStatement ps

spsActivation

private Activation spsActivation

Constructor Detail

GenericTriggerExecutor

GenericTriggerExecutor(InternalTriggerExecutionContext tec,
                       TriggerDescriptor triggerd,
                       Activation activation,
                       LanguageConnectionContext lcc)

Constructor

Parameters:

tec - the execution context

triggerd - the trigger descriptor

activation - the activation

lcc - the lcc

Method Detail

fireTrigger

abstract void fireTrigger(TriggerEvent event,
                          CursorResultSet brs,
                          CursorResultSet ars,
                          int[] colsReadFromTable)
                   throws StandardException

Fire the trigger based on the event.

Parameters:

event - the trigger event

brs - the before result set

ars - the after result set

colsReadFromTable - columns required from the trigger table by the triggering sql

Throws:

StandardException - on error or user exception from trigger action

getWhenClause

protected SPSDescriptor getWhenClause()
                               throws StandardException

Throws:

StandardException

getAction

protected SPSDescriptor getAction()
                           throws StandardException

Throws:

StandardException

executeSPS

protected void executeSPS(SPSDescriptor sps)
                   throws StandardException

Execute the given stored prepared statement. We just grab the prepared statement from the spsd, get a new activation holder and let er rip.

Throws:

StandardException - on error

clearSPS

protected void clearSPS()
                 throws StandardException

Cleanup after executing an sps.

Throws:

StandardException - on error