001    /**
002     * Copyright (c) 2000-2011 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
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            public String getLimitString(String sql, boolean hasOffset) {
026                    if (!sql.startsWith("(")) {
027                            return super.getLimitString(sql, hasOffset);
028                    }
029    
030                    StringBundler sb = new StringBundler(5);
031    
032                    sb.append("select cursor1.* from (");
033                    sb.append("select rownumber() over() as rownumber_, cursor2.* from (");
034                    sb.append(sql);
035                    sb.append(") as cursor2) as cursor1 where rownumber_");
036    
037                    if (hasOffset) {
038                            sb.append(" between ? + 1 and ?");
039                    }
040                    else {
041                            sb.append(" <= ?");
042                    }
043    
044                    return sb.toString();
045            }
046    
047    }