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Java > Open Source Codes > com > db4o > db4ounit > common > querying > CascadeOnDelete


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.db4ounit.common.querying;
22
23 import com.db4o.*;
24 import com.db4o.config.*;
25
26 import db4ounit.*;
27 import db4ounit.extensions.*;
28
29 public class CascadeOnDelete extends AbstractDb4oTestCase {
30     
31     public static class Item {
32         public String JavaDoc item;
33     }
34     
35     public Item[] items;
36     
37     public void test() throws Exception JavaDoc {
38         noAccidentalDeletes();
39     }
40     
41     private void noAccidentalDeletes() throws Exception JavaDoc {
42         noAccidentalDeletes1(true, true);
43         noAccidentalDeletes1(true, false);
44         noAccidentalDeletes1(false, true);
45         noAccidentalDeletes1(false, false);
46     }
47     
48     private void noAccidentalDeletes1(boolean cascadeOnUpdate, boolean cascadeOnDelete) throws Exception JavaDoc {
49         deleteAll(getClass());
50         deleteAll(Item.class);
51         
52         ObjectClass oc = Db4o.configure().objectClass(CascadeOnDelete.class);
53         oc.cascadeOnDelete(cascadeOnDelete);
54         oc.cascadeOnUpdate(cascadeOnUpdate);
55         
56         reopen();
57         
58         Item i = new Item();
59         CascadeOnDelete cod = new CascadeOnDelete();
60         cod.items = new Item[]{ i };
61         db().set(cod);
62         db().commit();
63         
64         cod.items[0].item = "abrakadabra";
65         db().set(cod);
66         if(! cascadeOnDelete && ! cascadeOnUpdate){
67             // the only case, where we don't cascade
68 db().set(cod.items[0]);
69         }
70         
71         Assert.areEqual(1, countOccurences(Item.class));
72         db().commit();
73         Assert.areEqual(1, countOccurences(Item.class));
74     }
75 }
76
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