content: /**
   * Copyright &copy; 2012-2016 <a href="https://github.com/HuangBingGui/jeespring">jeespring</a> All rights reserved.
   */
  package com.jeespring.common.persistence.dialect;
  
  import com.jeespring.common.persistence.dialect.Dialect;
  
  /**
   * Dialect for HSQLDB
   *
   * @author poplar.yfyang
   * @version 1.0 2010-10-10 下午12:31
   * @since JDK 1.5
   */
  public class HSQLDialect implements Dialect {
      @Override
      public boolean supportsLimit() {
          return true;
      }
  
      @Override
      public String getLimitString(String sql, int offset, int limit) {
          return getLimitString(sql, offset, Integer.toString(offset),
                  Integer.toString(limit));
      }
  
      /**
       * 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
       * <pre>
       * 如mysql
       * dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
       * select * from user limit :offset,:limit
       * </pre>
       *
       * @param sql               实际SQL语句
       * @param offset            分页开始纪录条数
       * @param offsetPlaceholder 分页开始纪录条数－占位符号
       * @param limitPlaceholder  分页纪录条数占位符号
       * @return 包含占位符的分页sql
       */
      public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
          boolean hasOffset = offset > 0;
          return
                  new StringBuffer(sql.length() + 10)
                          .append(sql)
                          .insert(sql.toLowerCase().indexOf("select") + 6, hasOffset ? " limit " + offsetPlaceholder + " " + limitPlaceholder : " top " + limitPlaceholder)
                          .toString();
      }
  
  }
  