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*
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*
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* this list of conditions and the following disclaimer in the documentation
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*
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* 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"
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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*/
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 {
// type of trigger
int INSERT_AFTER = 0;
int DELETE_AFTER = 1;
int UPDATE_AFTER = 2;
int INSERT_BEFORE = 3;
int DELETE_BEFORE = 4;
int UPDATE_BEFORE = 5;
int INSERT_AFTER_ROW = 6;
int DELETE_AFTER_ROW = 7;
int UPDATE_AFTER_ROW = 8;
int INSERT_BEFORE_ROW = 9;
int DELETE_BEFORE_ROW = 10;
int UPDATE_BEFORE_ROW = 11;
/**
* 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);
}