| DB2Dialect.java |
1 /**
2 * Copyright (c) 2000-2009 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.portal.dao.orm.hibernate;
24
25 /**
26 * <a href="DB2Dialect.java.html"><b><i>View Source</i></b></a>
27 *
28 * @author Shepherd Ching
29 * @author Jian Cao
30 *
31 */
32 public class DB2Dialect extends org.hibernate.dialect.DB2Dialect {
33
34 public String getLimitString(String sql, boolean hasOffset) {
35 if (!sql.startsWith("(")) {
36 return super.getLimitString(sql, hasOffset);
37 }
38
39 StringBuilder sb = new StringBuilder();
40
41 sb.append("select cursor1.* from (");
42 sb.append("select rownumber() over() as rownumber_, cursor2.* from (");
43 sb.append(sql);
44 sb.append(") as cursor2) as cursor1 where rownumber_");
45
46 if (hasOffset) {
47 sb.append(" between ? + 1 and ?");
48 }
49 else {
50 sb.append(" <= ?");
51 }
52
53 return sb.toString();
54 }
55
56 }