2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
31 package mircoders.storage;
33 import java.sql.Connection;
34 import java.sql.Statement;
36 import mir.log.LoggerWrapper;
37 import mir.storage.Database;
38 import mir.storage.StorageObjectFailure;
41 * <b>this class implements the access to the content-table</b>
46 public class DatabaseContent extends Database {
48 private static DatabaseContent instance;
50 // Contructors / Singleton
52 // the following *has* to be sychronized cause this static method
53 // could get preemted and we could end up with 2 instances of DatabaseFoo.
54 // see the "Singletons with needles and thread" article at JavaWorld -mh
55 public synchronized static DatabaseContent getInstance() {
57 if (instance == null ) {
58 instance = new DatabaseContent();
63 private DatabaseContent() throws StorageObjectFailure {
67 primaryKeySequence="media_id_seq";
68 logger = new LoggerWrapper("Database.Content");
70 entityClass = mircoders.entity.EntityContent.class;
76 * sets the database flag is_produced to unproduced
79 public void setUnproduced(String where) throws StorageObjectFailure
81 Connection con=null;Statement stmt=null;
82 String sql = "update content set is_produced='0' where " + where;
83 logger.debug("set unproduced: "+where);
85 con = obtainConnection();
86 // should be a preparedStatement because is faster
87 stmt = con.createStatement();
88 executeUpdate(stmt,sql);
89 logger.debug("set unproduced: "+where);
92 _throwStorageObjectException(e, "-- set unproduced failed");
94 finally { freeConnection(con,stmt);}
101 * @throws StorageObjectFailure
104 public boolean delete(String id) throws StorageObjectFailure
106 DatabaseComment.getInstance().deleteByContentId(id);
107 DatabaseContentToTopics.getInstance().deleteByContentId(id);
108 DatabaseContentToMedia.getInstance().deleteByContentId(id);
110 return super.delete(id);