public boolean doOrder(Integer oid) throws Exception {
		boolean flag = false;
		String Sql = "UPDATE product_order SET flag=0 WHERE oid=?";
		this.pstmt = this.conn.prepareStatement(Sql);
		this.pstmt.setInt(1,oid);
		if(this.pstmt.executeUpdate()>0){
			flag = true;
		}
		return flag;
	}