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  }