Ajax实现分页查询

       
    }
   
    xhr.send(paramString);
};

    最后列出一个Oracle的按数量范围查询的SQL语句：(查询前50条记录)
SELECT *
  FROM (SELECT   /*+ FULL(tablename)*/  fieldname, ROWNUM rn FROM tablename WHERE condition  AND ROWNUM <= 50 ORDER BY field DESC) t2  where t2.rn >= 1;