001/* 
002 * JKNIV, whinstone one contract to access your database.
003 * 
004 * Copyright (C) 2017, the original author or authors.
005 *
006 * This library is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 2.1 of the License.
010 * 
011 * This library is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 * 
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with this library; if not, write to the Free Software Foundation, Inc., 
018 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
019 */
020package net.sf.jkniv.whinstone.jdbc.dialect;
021
022import net.sf.jkniv.sqlegance.dialect.AnsiDialect;
023import net.sf.jkniv.sqlegance.dialect.SqlFeatureFactory;
024import net.sf.jkniv.sqlegance.dialect.SqlFeatureSupport;
025
026/**
027 * Default dialect to DB2.
028 * <p>
029 *  Limit clause:
030 *   <code>select name from author FETCH FIRST 20 ROWS ONLY</code>
031 * </p>
032 * <ul>
033 *  <li>Supports limits? true</li>
034 *  <li>Supports limit off set? false</li>
035 *  <li>Supports rownum? false</li>
036 * </ul>
037 *
038 * @author Alisson Gomes 
039 * @since 0.6.0
040 */
041public class DB2Dialect extends AnsiDialect
042{
043    public DB2Dialect()
044    {
045        super();
046        addFeature(SqlFeatureFactory.newInstance(SqlFeatureSupport.LIMIT, true));
047        addFeature(SqlFeatureFactory.newInstance(SqlFeatureSupport.LIMIT_OFF_SET, false));
048    }
049    
050    /**
051     *  LIMIT and OFFSET clause for DB2 with DB2_COMPATIBILITY_VECTOR=MYS enabled, 
052     *  where LIMIT and OFFSET are parameter from String.format
053     *  
054     *  @return Return query pattern: 
055     *  
056     * <pre> 
057     *   select name from author  FETCH FIRST   20   ROWS ONLY
058     * </pre>
059     */
060    @Override
061    public String getSqlPatternPaging()
062    {
063        return "%1$s FETCH FIRST %2$s ROWS ONLY";
064    }
065}