下载文件 急!!!!!!!!!!!
fly 2005-04-01 02:17:51 InputStream f=null;
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
Connection conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://btntest:1433;DatabaseName=mytrack;user=sa;Password=btn");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select FileData from TTRAILAttachUpload where AID=" + ParamUtil.getParameter(request,"AID"));
rs.next();
f =rs.getBinaryStream("FileData");
System.out.println(f.available());
问题:这里打印输出是总是0,在数据库里是有数据的。难道只能上传到数据库,而不能从数据库中下载吗?