KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > quadcap > sql > SelectStmt


1 package com.quadcap.sql;
2
3 /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
4  *
5  * This software is distributed under the Quadcap Free Software License.
6  * This software may be used or modified for any purpose, personal or
7  * commercial. Open Source redistributions are permitted. Commercial
8  * redistribution of larger works derived from, or works which bundle
9  * this software requires a "Commercial Redistribution License"; see
10  * http://www.quadcap.com/purchase.
11  *
12  * Redistributions qualify as "Open Source" under one of the following terms:
13  *
14  * Redistributions are made at no charge beyond the reasonable cost of
15  * materials and delivery.
16  *
17  * Redistributions are accompanied by a copy of the Source Code or by an
18  * irrevocable offer to provide a copy of the Source Code for up to three
19  * years at the cost of materials and delivery. Such redistributions
20  * must allow further use, modification, and redistribution of the Source
21  * Code under substantially the same terms as this license.
22  *
23  * Redistributions of source code must retain the copyright notices as they
24  * appear in each source code file, these license terms, and the
25  * disclaimer/limitation of liability set forth as paragraph 6 below.
26  *
27  * Redistributions in binary form must reproduce this Copyright Notice,
28  * these license terms, and the disclaimer/limitation of liability set
29  * forth as paragraph 6 below, in the documentation and/or other materials
30  * provided with the distribution.
31  *
32  * The Software is provided on an "AS IS" basis. No warranty is
33  * provided that the Software is free of defects, or fit for a
34  * particular purpose.
35  *
36  * Limitation of Liability. Quadcap Software shall not be liable
37  * for any damages suffered by the Licensee or any third party resulting
38  * from use of the Software.
39  */
40
41 import java.util.Vector JavaDoc;
42
43 import java.io.IOException JavaDoc;
44
45 import java.sql.ResultSet JavaDoc;
46 import java.sql.SQLException JavaDoc;
47
48 import com.quadcap.sql.index.Btree;
49
50 import com.quadcap.util.Debug;
51
52 /**
53  * Implementation of SQL <b>SELECT</b> statement.
54  *
55  * @author Stan Bailes
56  */
57
58
59
60
61 public class SelectStmt implements Stmt {
62     TableExpression expression;
63     Vector JavaDoc order;
64
65     public SelectStmt() {}
66     
67     public SelectStmt(TableExpression expression) {
68     this.expression = expression;
69     }
70
71     public void setOrder(Vector JavaDoc order) {
72     this.order = order;
73     }
74
75     public void execute(Session session) throws IOException JavaDoc, SQLException JavaDoc {
76         Cursor c = expression.getCursor(session, null);
77         if (order != null) {
78             if (c instanceof DistinctCursor) {
79                 ((DistinctCursor)c).setOrder(order);
80             } else {
81                 c = new OrderByCursor(session, c, order);
82             }
83         }
84         session.addCursor(c);
85         Database db = session.getDatabase();
86         QedResultSet rs = db.getDriver().makeResultSet(c);
87         session.setResultSet(rs);
88     }
89 }
90
91
Popular Tags