Trigger


1   /*
2    * Copyright 2004-2006 H2 Group. Licensed under the H2 License, Version 1.0 (http://h2database.com/html/license.html).
3    * Initial Developer: H2 Group
4    */
5   package org.h2.api;
6   
7   import java.sql.Connection  ;
8   import java.sql.SQLException  ;
9   
10  /**
11   * A class that implements this interface can be used as a trigger.
12   *
13   * @author Thomas
14   */
15  
16  public interface Trigger {
17  
18      /**
19       * This method is called by the database engine once when initializing the trigger.
20       *
21       * @param conn a connection to the database
22       * @param schemaName the name of the schema
23       * @param triggerName the name of the trigger used in the CREATE TRIGGER statement
24       * @param tableName the name of the table
25       */
26      void init(Connection   conn, String   schemaName, String   triggerName, String   tableName) throws SQLException  ;
27  
28      /**
29       * This method is called for each triggered action.
30       *
31       * @param conn a connection to the database
32       * @param oldRow the old row, or null if no old row is available (for INSERT)
33       * @param newRow the new row, or null if no new row is available (for DELETE)
34       * @throws SQLException if the operation must be undone
35       */
36      void fire(Connection   conn, Object  [] oldRow, Object  [] newRow) throws SQLException  ;
37  
38  }
39

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