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最近学习框架做了一个小网站,基本功能都实现了但是分页没办法用框架思想实现,查了资料找到一个不错的,修改了下分享下

2013-11-19 19:55 886 查看
里边的一些方法我也理解,核心思想就是把你传入的hql语句进行拆分重组成SQLserver2005的新分页函数row_number() over(order by id)最后将结果返回字符串,作为将来要传入hibernate的sql语句.测试返回的语句为select * from (,ROW_NUMBER() OVER(order by Book.bookid as book) as _page_row_num_hb from Book as book ) temp where _page_row_num_hb BETWEEN 11 and 20.可以使用.之后返回的list通过struts2 配置antion中的方法放到一个session中然后在jsp页面通过传入不同的参数实现分页这些代码就不演示了.
public class Spage extends SQLServerDialect{		public static void main(String[] args) {		Spage sp=new Spage();		String sql=sp.getLimitString("from Book as book order by Book.bookid as book", 10, 20);		System.out.println(sql);	}	 public static int getLastIndexOfOrderBy(String sql){	        return sql.toLowerCase().lastIndexOf("order by");	    }	    	    public  String getLimitString(String querySelect, int offset, int limit ){	        int lastIndexOfOrderBy = getLastIndexOfOrderBy(querySelect);	        // 没有 order by 或第一页的情况下	        if(lastIndexOfOrderBy<0 || querySelect.endsWith(")") || offset==0)	            return super.getLimitString(querySelect, 0, limit);	        else {	            //取出 order by 语句	            String orderby = querySelect.substring(lastIndexOfOrderBy, querySelect.length());	            //取出 from 前的内容	            int indexOfFrom = querySelect.toLowerCase().indexOf("from");	            String selectFld = querySelect.substring(0,indexOfFrom);	            //取出 from 语句后的内容	            String selectFromTableAndWhere = querySelect.substring(indexOfFrom, lastIndexOfOrderBy);	            StringBuffer sql = new StringBuffer(querySelect.length()+100);	            sql.append("select * from (")	                .append(selectFld)	                .append(",ROW_NUMBER() OVER(").append(orderby).append(") as _page_row_num_hb ")	                .append(selectFromTableAndWhere).append(" ) temp ")	                .append(" where  _page_row_num_hb BETWEEN  ")	                .append(offset+1).append(" and ").append(limit);	            return sql.toString();	        }	    }	    //使offset 参数生效	    public boolean supportsLimitOffset(){	        return true;	    }}
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