01: package com.quadcap.sql;
02:
03: /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
04: *
05: * This software is distributed under the Quadcap Free Software License.
06: * This software may be used or modified for any purpose, personal or
07: * commercial. Open Source redistributions are permitted. Commercial
08: * redistribution of larger works derived from, or works which bundle
09: * 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;
42:
43: import java.io.IOException;
44:
45: import java.sql.ResultSet;
46: import java.sql.SQLException;
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: public class SelectStmt implements Stmt {
59: TableExpression expression;
60: Vector order;
61:
62: public SelectStmt() {
63: }
64:
65: public SelectStmt(TableExpression expression) {
66: this .expression = expression;
67: }
68:
69: public void setOrder(Vector order) {
70: this .order = order;
71: }
72:
73: public void execute(Session session) throws IOException,
74: SQLException {
75: Cursor c = expression.getCursor(session, null);
76: if (order != null) {
77: if (c instanceof DistinctCursor) {
78: ((DistinctCursor) c).setOrder(order);
79: } else {
80: c = new OrderByCursor(session, c, order);
81: }
82: }
83: session.addCursor(c);
84: Database db = session.getDatabase();
85: QedResultSet rs = db.getDriver().makeResultSet(c);
86: session.setResultSet(rs);
87: }
88: }
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