blob字段插入问题

[laocai]

我现在向一表中把一张图插入blob字段中,发现如果图片较大时,就会出错.
File file = new File("example.jpg");
FileInputStream fis = new FileInputStream(file);
String blobstr="update picture set pic_blob=? where pic_id="+pic_id;
PreparedStatement ps = con.prepareStatement(blobstr);
int filelen=(int) file.length();
ps.setBinaryStream(1,fis,filelen);
ps.executeUpdate();
ps.close();
fis.close();
不知问题出在那里,怎么解决??