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Java > Open Source Codes > smallsql > database > TableStorePageInsert


1 /* =============================================================
2  * SmallSQL : a free Java DBMS library for the Java(tm) platform
3  * =============================================================
4  *
5  * (C) Copyright 2004-2006, by Volker Berlin.
6  *
7  * Project Info: http://www.smallsql.de/
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------
28  * TableStorePageInsert.java
29  * ---------------
30  * Author: Volker Berlin
31  *
32  * Created on 16.08.2004
33  */
34 package smallsql.database;
35
36 import java.sql.*;
37
38 /**
39  * This is a TableStorePage for insert operations. The advantages is a link.
40  * Because a new StorePage has no filepos before it was commit it is difficult to refind the StorePage
41  * after if was commit
42  * With this link the StorePage can be refind if it was commit and save or not.
43  * @author Volker Berlin
44  */
45 class TableStorePageInsert extends TableStorePage {
46
47     final private StorePageLink link = new StorePageLink();
48
49     TableStorePageInsert(SSConnection con, Table table, int lockType){
50         super( con, table, lockType, -1);
51         link.page = this;
52         link.filePos = fileOffset;
53     }
54     
55
56     /**
57      * Call supper.commit() and update the link.
58      */
59     final long commit() throws SQLException{
60         long result = super.commit();
61         link.filePos = fileOffset;
62         link.page = null;
63         return result;
64     }
65     
66     
67     /**
68      * Return the link to this StorePage
69      */
70     final StorePageLink getLink(){
71         return link;
72     }
73 }
74
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