|
HSQLDB example source code file (Trigger.java)
The HSQLDB Trigger.java source code/* Copyright (c) 2001-2008, The HSQL Development Group * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of the HSQL Development Group nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package org.hsqldb; // fredt@users 20030727 - signature altered to support update triggers /* Contents of row1[] and row2[] in each type of trigger. BEFORE INSERT - row1[] contains single String object = "Statement-level". AFTER INSERT - row1[] contains single String object = "Statement-level". BEFORE UPDATE - row1[] contains single String object = "Statement-level". AFTER UPDATE - row1[] contains single String object = "Statement-level". BEFORE DELETE - row1[] contains single String object = "Statement-level". AFTER DELETE - row1[] contains single String object = "Statement-level". BEFORE INSERT FOR EACH ROW - row2[] contains data about to be inserted and this can be modified within the trigger such that modified data gets written to the database. AFTER INSERT FOR EACH ROW - row2[] contains data just inserted into the table. BEFORE UPDATE FOR EACH ROW - row1[] contains currently stored data and not the data that is about to be updated. - row2[] contains the data that is about to be updated. AFTER UPDATE FOR EACH ROW - row1[] contains old stored data. - row2[] contains the new data. BEFORE DELETE FOR EACH ROW - row1[] contains row data about to be deleted. AFTER DELETE FOR EACH ROW - row1[] contains row data that has been deleted. List compiled by Andrew Knight (quozzbat@users) */ /** * The interface an HSQLDB TRIGGER must implement. The user-supplied class that * implements this must have a default constructor. * * @author Peter Hudson * @version 1.7.2 * @since 1.7.0 */ public interface Trigger { // indexes into the triggers list int INSERT_AFTER = 0; int DELETE_AFTER = 1; int UPDATE_AFTER = 2; int INSERT_BEFORE = INSERT_AFTER + TriggerDef.NUM_TRIGGER_OPS; int DELETE_BEFORE = DELETE_AFTER + TriggerDef.NUM_TRIGGER_OPS; int UPDATE_BEFORE = UPDATE_AFTER + TriggerDef.NUM_TRIGGER_OPS; int INSERT_AFTER_ROW = INSERT_AFTER + 2 * TriggerDef.NUM_TRIGGER_OPS; int DELETE_AFTER_ROW = DELETE_AFTER + 2 * TriggerDef.NUM_TRIGGER_OPS; int UPDATE_AFTER_ROW = UPDATE_AFTER + 2 * TriggerDef.NUM_TRIGGER_OPS; int INSERT_BEFORE_ROW = INSERT_BEFORE + 2 * TriggerDef.NUM_TRIGGER_OPS; int DELETE_BEFORE_ROW = DELETE_BEFORE + 2 * TriggerDef.NUM_TRIGGER_OPS; int UPDATE_BEFORE_ROW = UPDATE_BEFORE + 2 * TriggerDef.NUM_TRIGGER_OPS; /** * The method invoked upon each triggered action. <p> * * When UPDATE triggers are fired, oldRow contains the * existing values of the table row and newRow contains the * new values.<p> * * For INSERT triggers, oldRow is null and newRow contains the * table row to be inserted. * * For DELETE triggers, newRow is null and oldRow contains the * table row to be deleted. * * type contains the integer index id for trigger type, e.g. * TriggerDef.INSERT_AFTER (fredt@users) * * @param trigName the name of the trigger * @param tabName the name of the table upon which the * triggered action is occuring * @param oldRow the old row * @param newRow the new row */ void fire(int type, String trigName, String tabName, Object[] oldRow, Object[] newRow); } Other HSQLDB examples (source code examples)Here is a short list of links related to this HSQLDB Trigger.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.