| DB2Dialect.java |
1 /**
2 * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.util.dao.hibernate;
24
25 import com.liferay.portal.kernel.util.StringMaker;
26
27 /**
28 * <a href="DB2Dialect.java.html"><b><i>View Source</i></b></a>
29 *
30 * @author Shepherd Ching
31 * @author Jian Cao
32 *
33 */
34 public class DB2Dialect extends org.hibernate.dialect.DB2Dialect {
35
36 public String getLimitString(String sql, boolean hasOffset) {
37 if (!sql.startsWith("(")) {
38 return super.getLimitString(sql, hasOffset);
39 }
40
41 StringMaker sm = new StringMaker();
42
43 sm.append("select cursor1.* from (");
44 sm.append("select rownumber() over() as rownumber_, cursor2.* from (");
45 sm.append(sql);
46 sm.append(") as cursor2) as cursor1 where rownumber_");
47
48 if (hasOffset) {
49 sm.append(" between ? + 1 and ?");
50 }
51 else {
52 sm.append(" <= ?");
53 }
54
55 return sm.toString();
56 }
57
58 }