public List getHotIssu() throws Exception{
		Connection conn = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		String sql = "";
		List issueList = null;
		DataBean bean = null;
		try{
			sql="select ROWNUM, b.* from (select * from (select * from board union all select * from food union all select * from travel)" +
					" order by read_count desc) b where ROWNUM<=3";
			conn = getConnection();
			pstmt = conn.prepareStatement(sql);
			rs = pstmt.executeQuery();
			if(rs.next()){
				issueList = new ArrayList(3);
				do{
					bean = new DataBean();
					bean.setTitle(rs.getString("title"));
					bean.setNickname(rs.getString("nickname"));
					issueList.add(bean);
				}while(rs.next());
			}
		}catch(Exception ex){
			ex.printStackTrace();
		}finally{
			if(rs != null){
				try{rs.close();}
				catch(SQLException e){e.printStackTrace();}
			}
			if(pstmt != null){
				try{pstmt.close();}
				catch(SQLException e){e.printStackTrace();}
			}
			if(conn != null){
				try{conn.close();}
				catch(SQLException e){e.printStackTrace();}
			}
		}return issueList;
	}