Package org.h2.samples

Class UpdatableView

java.lang.Object

org.h2.tools.TriggerAdapter

org.h2.samples.UpdatableView

All Implemented Interfaces:

Trigger

public class UpdatableView
extends TriggerAdapter

This sample application shows how to use triggers to create updatable views.

Field Summary

Fields inherited from class org.h2.tools.TriggerAdapter

before, schemaName, tableName, triggerName, type

Fields inherited from interface org.h2.api.Trigger

DELETE, INSERT, SELECT, UPDATE

Constructor Summary

Constructors

Constructor	Description
UpdatableView()

Method Summary

Modifier and Type	Method	Description
void	close()	This method is called when the database is closed.
void	fire(Connection conn, ResultSet oldRow, ResultSet newRow)	This method is called for each triggered action by the default fire(Connection conn, Object[] oldRow, Object[] newRow) method.
void	init(Connection conn, String schemaName, String triggerName, String tableName, boolean before, int type)	This method is called by the database engine once when initializing the trigger.
static void	main(String... args)	This method is called when executing this sample application from the command line.

Methods inherited from class org.h2.tools.TriggerAdapter

fire

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.h2.api.Trigger

remove

Constructor Details

UpdatableView

public UpdatableView()

Method Details

main

public static void main(String... args)
                 throws Exception

This method is called when executing this sample application from the command line.

Parameters:

args - ignored

Throws:

Exception - on failure

init

public void init(Connection conn,
 String schemaName,
 String triggerName,
 String tableName,
 boolean before,
 int type)
          throws SQLException

Description copied from class: TriggerAdapter

This method is called by the database engine once when initializing the trigger. It is called when the trigger is created, as well as when the database is opened. The default implementation initialized the result sets.

Specified by:

init in interface Trigger

Overrides:

init in class TriggerAdapter

Parameters:

conn - a connection to the database

schemaName - the name of the schema

triggerName - the name of the trigger used in the CREATE TRIGGER statement

tableName - the name of the table

before - whether the fire method is called before or after the operation is performed

type - the operation type: INSERT, UPDATE, DELETE, SELECT, or a combination (this parameter is a bit field)

Throws:

SQLException - on SQL exception

fire

public void fire(Connection conn,
 ResultSet oldRow,
 ResultSet newRow)
          throws SQLException

Description copied from class: TriggerAdapter

This method is called for each triggered action by the default fire(Connection conn, Object[] oldRow, Object[] newRow) method.

For "before" triggers, the new values of the new row may be changed using the ResultSet.updateX methods.

Specified by:

fire in class TriggerAdapter

Parameters:

conn - a connection to the database

oldRow - the old row, or null if no old row is available (for INSERT)

newRow - the new row, or null if no new row is available (for DELETE)

Throws:

SQLException - if the operation must be undone

close

public void close()
           throws SQLException

Description copied from interface: Trigger

This method is called when the database is closed. If the method throws an exception, it will be logged, but closing the database will continue.

Throws:

SQLException - on SQL exception