oracle分页查询语句，java得到分页查询语句的方法

 

oracle分页查询语句

select * from ( select a.*, rownum rn from (select * from table_name) a where rownum <= 40 ) where rn >= 21

 

java得到分页查询语句的方法

/**
 * 得到分页查询的语句
 * @param queryString
 * @param pageIndex
 * @param pageSize
 * @return
 */
public String getPageQl(String queryString, int pageIndex, int pageSize){
	//select * from ( select a.*, rownum rn from (select * from table_name) a where rownum <= 40 ) where rn >= 21
	String ql = "select * from ( select page_.*, rownum rn from ("+queryString+") page_ where rownum <= "+pageIndex*pageSize+" ) where rn > "+(pageIndex-1)*pageSize;
	//log.info(ql);
	return ql;
}

 

排序的时候，最好再加上按id排序，解决翻页数据重复的问题。