Source code: javatools/db/DbReferencedDeleter.java
1 /*
2 Javatools (modified version) - Some useful general classes.
3 Copyright (C) 2002-2003 Chris Bitmead (original) Antonio Petrelli (modified)
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Contact me at: brenmcguire@users.sourceforge.net
20 */
21 package javatools.db;
22 import java.util.*;
23 import java.sql.*;
24 import javatools.util.FileLog;
25 import javatools.util.ArrayComparator;
26
27 /**
28 * It is just a DbDeleter, except in the fact it takes care of constraints.
29 * @author Antonio Petrelli
30 * @version 0.2.0
31 */
32
33 public class DbReferencedDeleter extends DbDeleter{
34
35 /** Creates a new DbReferencedDeleter.
36 * @param table The table to delete rows from.
37 */
38 DbReferencedDeleter(DbAbstractTable table) {
39 super(table);
40 }
41
42 /**
43 * Execute this command on the default connection. Eventually cascades its effects
44 * through the table's constraint.
45 *
46 * @return The number of record affected.
47 * @exception DbException If something goes wrong.
48 */
49 public int execute() throws DbException {
50 DbConstraint tempConstraint;
51
52 tempConstraint = table.getConstraint();
53 if (tempConstraint != null) {
54 tempConstraint.clear();
55 tempConstraint.setWhere(where);
56 return tempConstraint.update(DbConstraint.DELETE_OPERATION);
57 }
58 else
59 return super.execute();
60 }
61 }