001    /**
002     * Copyright (c) 2000-2011 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.dao.orm.hibernate;
016    
017    import com.liferay.portal.kernel.util.StringBundler;
018    
019    /**
020     * @author Shepherd Ching
021     * @author Jian Cao
022     */
023    public class DB2Dialect extends org.hibernate.dialect.DB2Dialect {
024    
025            @Override
026            public String getLimitString(String sql, boolean hasOffset) {
027                    if (!sql.startsWith("(")) {
028                            return super.getLimitString(sql, hasOffset);
029                    }
030    
031                    StringBundler sb = new StringBundler(5);
032    
033                    sb.append("select cursor1.* from (");
034                    sb.append("select rownumber() over() as rownumber_, cursor2.* from (");
035                    sb.append(sql);
036                    sb.append(") as cursor2) as cursor1 where rownumber_");
037    
038                    if (hasOffset) {
039                            sb.append(" between ? + 1 and ?");
040                    }
041                    else {
042                            sb.append(" <= ?");
043                    }
044    
045                    return sb.toString();
046            }
047    
048    }