| DB2Dialect.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * The contents of this file are subject to the terms of the Liferay Enterprise
5 * Subscription License ("License"). You may not use this file except in
6 * compliance with the License. You can obtain a copy of the License by
7 * contacting Liferay, Inc. See the License for the specific language governing
8 * permissions and limitations under the License, including but not limited to
9 * distribution rights of the Software.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 package com.liferay.portal.dao.orm.hibernate;
21
22 /**
23 * <a href="DB2Dialect.java.html"><b><i>View Source</i></b></a>
24 *
25 * @author Shepherd Ching
26 * @author Jian Cao
27 *
28 */
29 public class DB2Dialect extends org.hibernate.dialect.DB2Dialect {
30
31 public String getLimitString(String sql, boolean hasOffset) {
32 if (!sql.startsWith("(")) {
33 return super.getLimitString(sql, hasOffset);
34 }
35
36 StringBuilder sb = new StringBuilder();
37
38 sb.append("select cursor1.* from (");
39 sb.append("select rownumber() over() as rownumber_, cursor2.* from (");
40 sb.append(sql);
41 sb.append(") as cursor2) as cursor1 where rownumber_");
42
43 if (hasOffset) {
44 sb.append(" between ? + 1 and ?");
45 }
46 else {
47 sb.append(" <= ?");
48 }
49
50 return sb.toString();
51 }
52
53 }