JDBC10 Blob二进制对象

Posted 2022-09-20 code-fun

             //将图片输入到数据库中
//            String sql="insert into t_user2 (username,headImg) values (?,?)";
//            ps=conn.prepareStatement(sql);
//            ps.setObject(1, 2);
//            ps.setBlob(2, new FileInputStream("d:/img.png"));
//            ps.execute();
            
            //读取图片到程序中再转出去
            String sql="select * from t_user2 where id=?";
            ps=conn.prepareStatement(sql);
            ps.setObject(1, 3);
            rs=ps.executeQuery();
            while(rs.next()) 
            Blob b=rs.getBlob("headImg");
             is=b.getBinaryStream();
            byte[] temp=new byte[1024*10];
            int len;
            os=new FileOutputStream("d:/imgcopy");
            while((len=is.read(temp))!=-1)
                os.write(temp, 0, len);